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Glossary of Terms

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125kHz - Radio transmission operating at 125 thousand cycles per second. This technology has historically been the standard for proximity cards/readers

128 Bit AES - A specification for the encryption of electronic data using a 128 bit symmetric key algorithm

13.56MHz - Radio transmission operating at 13.56 million cycles per second. This technology has historically been the standard for smart cards/readers

161 Prep - Cutout (or hole) in a door for bored/cylindrical locksets. Also known as Cylindrical Lock Prep

26 Bit Format - The most common data format for RFID badges. It consists of 4 components. Even Parity (1 Bit), Facility Code (8 Bits), Card # (16 Bits) and Odd Parity (1 Bit)

3DES (TDEA) - Triple DES is a specification for the encryption of electronic data which applies the data encryption standard three times to each block

86 Edge Prep - See mortise lock prep

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A

Access Control - Controlling entry of people into buildings, rooms, and racks, and controlling the use of keyboards and equipment, by the use of automated devices that either read information stored on an object such a card (what you have), receive a code or password (what you know), or recognize a physical trait by biometric analysis (what you are)

Access Credential - A medium that contains encoded information, such as ID cards, key fobs, & smart chips

Access Level - A logical group of doors paired with a time schedule used to determine when and where a card is granted access

Access Point - A place along the perimeter of a secure area where there is a door/gate/portal and some type of access control method to screen users attempting entry to the area

Active Door (in a pair of doors) - The leaf that opens first and the one to which the lock is applied

Actuating Bar - The activating mechanism of an exit device is located on the egress side of a door and extends at least half the width of the door. The active surface of the actuating bar shall be visually and physically distinct from the rest of the device. AKA cross bar or pushpad

ADA - Americans with Disabilities Act

ADA Requirements - The Federal “Americans with Disabilities Act” requires that buildings be accessible and contains specific requirements for doors

Adjustment / Repair - Any action that could affect the outcome of a test conducted during an AAADM inspection

AHC - Indicates that the individual so identified is a qualified Architectural Hardware Consultant and member of the Door and Hardware Institute

AHJ - Authorities having Jurisdiction

Alarm input - A monitoring point on a panel that checks the status of a device, typically digital (open/closed). Thru the use of resistors, they may also monitor a normal/alarm/short/open

All-Glass Slider - A sliding door package including a heavy glass panel that has no vertical stiles

Alternating Current - An electric current that reverses its direction regularly and continually. The voltage alternates its polarity and direction of current flow negative to positive. AC current increases to a peak, decreases through zero and peaks in the opposite direction. AC current flows back and forth in the conductor and is expressed in cycles per second or Hertz (Hz)

Ambient Temperature - The temperature of the air in the immediately surrounding environment

Ampere (A, amp) - The unit of measurement for the rate of electrical current flow, characterized by the symbols 'I' (in Ohm's law formulas) or 'A.' One ampere is the current flowing through one ohm of resistance at one volt potential

Ampere/hour (AH) - A measurement of a battery's capacity. One ampere of current flowing for one hour equals one ampere/hour

Anchor - A device used to attach a door frame to the surrounding structure or wall

Annunciator - An audible and/or visual signaling device

ANSI - The American National Standards Institute (ANSI) is a private, non-profit organization that administers and coordinates the U.S. voluntary standardization and conformity assessment system

Anti-collision - The process built into an RFID system that protects multiple cards from being read at the same time when within the readers RF field

Anti-Friction Bearing - Any bearing having the capability of effectively reducing friction

Anti-Friction Latch Bolt - A latch bolt designed to reduce friction when the bolt starts to engage the lock strike

Anti-passback - Refers to a systems ability to track an individuals in/out status at a facility, typically through entrance and exit card readers. Once a person has entered, they cannot enter again until they have exited

API - Application Programming Interface is a source code interface that is provided in order to support requests to be made by other computer programs and/or allow data to be exchanged

Approach Mat - A control mat that causes the door to open when activated

Approach-Side - The side from which a person activates an automatic door

Architectural Hardware - Term applied to all hardware used in building construction but particularly that used on or in connection with doors, windows, cabinets and other movable members

Armor Plate - A plate similar to a kick plate but covering the door to a greater height, usually 40" (1040 mm) or more from the bottom

Armored Front - A lock that consists of two plates: one, the under plate, is fastened to the case and is unfinished; two, the finish plate, is fastened to the under plate and when in place covers the cylinder set screws thus protecting them from tampering. Used on mortise locks

Astragal - A molding or strip whose purpose is to cover or close the gap between the edges of a pair of doors. Some types overlap, others meet at the center line of the gap (See Coordinator)

Audit Trail - A record of transactions that can be used by an interested party to trace an access control activities during a specific time period

Automatic Door - The combination of door, operator, and controls constituting the system

Automatic Extension Flush Bolt - A flush mounted locking device for the inactive leaf of a pair of doors. When the active leaf is opened, the inactive leaf is capable of being pushed open and when it closes, the bolt latches automatically by the closing of the active leaf and is held latched by the active leaf

Automatic Latching Two Point Bolts - A surface or concealed mounted top and bottom locking device for the inactive leaf of a pair of doors. It is manually unlocked to open, but when the leaf is closed, the bolts latch automatically

Auto Re-Arm - Alarm sounds if the door is opened in the armed condition, and will automatically re-arm 2 minutes after the door is closed

Auxiliary Dead Latch - A supplementary latch that automatically deadlocks the main latch bolt when the door is closed (Also called Deadlocking Latch Bolt)

Availability Percentage - A calculated prediction of a system’s percentage of “uptime.” For mission-critical facilities, the goal is “five "nines” or 99.999% – less than 5 minutes of downtime per year

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B

Back Check - Optional feature in hydraulic door closers slowing the opening swing of door somewhere between 60 and 85 degrees of opening. Designed to protect an object be hind the door. Not intended to act as an overhead stop

Backset (of a hinge) - The distance from the edge of the door to the hinge

Backset (of a lock) - The horizontal distance from the face of the lock to the center line of knob hub, keyhole or cylinder (Measured from the high side of a beveled door)

Ball-Bearing Hinge - A hinge equipped with ball bearings between the hinge knuckles to reduce friction (See Anti-Friction Bearing)

Bandwidth - The amount of data a network can transport in a given time period

Bar-code Card - A type of access control card that uses an array of machine readable bars and spaces to represent the encoded information such as card number

Barium Ferrite Card - A type of access control card that uses a pattern of magnetic spots to store information; read by laying flat on a reader. Also called a "magnetic spot card."

Base Anchor - A piece of metal attached to base of a door frame, to secure frame to the floor. Also known as Floor Anchor

Bevel (of a door) - The angle of the lock edge in relation to the face of the lock stile. Standard bevel is 1/8" in 2" (3.2 mm in 50.8 mm). If otherwise detailed it must be so noted in ordering locks

Beveled Door Edge - The edge of a door which is not at a 90 degree angle to the face of the door - standard bevel is 1/8 inch in 2 inches - narrow side of door is in contact with stop of frame when door is closed

Bevel (of a lock front) - The angle of a lock front when not at right angle to the lock case, allowing the front to be applied flush with the edge of a beveled door

Bevel (of a lock) - A term used to indicate the direction in which the latch bolt is in dined: regular bevel for doors opening in, reverse bevel for doors opening out

BHMA Functions
01: Exit only, no trim or blank escutcheon
02: Entrance by trim when actuating bar is locked down
03: Entrance by trim when latch bolt is released by key. Key removable only when locked
04: Entrance by trim when latch bolt is released by key or set in a retracted position by key
05: Entrance by thumb piece. Key locks or unlocks by thumb piece
06: Entrance by thumb piece only when released by key. Key removable only when locked
07: Entrance by thumb piece. Inside or outside key locks or unlocks thumb piece. Outside key releases latch
08: Entrance by knob or lever. Key locks or unlocks knob or lever
09: Entrance by knob or lever only when released by key. Key removable only when locked
10: Entrance by knob or lever. Inside or outside key locks or unlocks knob or lever. Outside key releases latch
11: Entrance by control turnpiece. Key locks or unlocks control
12: Entrance by control turnpiece only when released by turning key. Key removable only when locked
13: Entrance by key or combination lock
14: Entrance by trim when latch bolt is released by knob or lever. Always active, no cylinder
15: Entrance by trim when latch is released by thumb piece. Thumb piece always active, no cylinder
16: Entrance by trim when latch is released by control turnpiece. Turnpiece always active, no cylinder
17: Entrance by control turnpiece. Inside or outside key locks or unlocks turnpiece. Outside key releases latch

Biometric Lock - A lock that is controlled by a biometric scanner, such as fingerprint, hand geometry, retina identification, etc.

Biometrics - Establishing personal identity verification using technology to measure a physical or behavioral trait – for example, a fingerprint

Bit (of a key) - The projecting blade, cut in a manner that actuates the tumblers and permits the lock bolts to be operated

Blocking Diode - An electronic device used to allow electricity to flow in only one direction

BOCA - Building Officials and Code Administration international

Bored Lock (or Latch) - Lock or latch whose parts are intended for installation in holes bored in a door

Borrowed Lite - A four sided steel frame, which is glazed (has glass) but does not include a door. Also known as a steel window frame

Box Strike - A strike that also provides a complete housing to protect the bolt openings

Bridge Rectifier - Converts AC voltage to DC

Builders Hardware - See Architectural Hardware

Butt (Hinge) - A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame

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C

Cam (of a cylinder) - A rotating piece attached to the end of the cylinder plug to engage the locking mechanism

Cane Bolt - A heavy cane-shaped bolt with the top bent at right angles; used on the bottom of doors

Capacitor (CAP) - An electronic component used throughout electronic circuitry for filtering, timing, current limiting, and many other uses. The value is usually expressed in terms of micro-farads and the voltage rating in terms of either AC or DC working volts

Card Reader - A device which interprets coding resident on or in a credential

Cart Bar / Crash Bar - A bar or series of bars mounted on a door panel to protect it and the glass from breakage

Case (of a lock) - The box containing the lock mechanism

Cased Opening - A steel frame with no stops

Casement Hinge - A hinge to swing a casement window. The term is often used to describe a hinge designed to throw the sash out far enough to permit cleaning the outside of the glass from the inside of the room on an outward-swinging casement

CDC - Indicates that the individual so identified is a Certified Door Consultant and member of the Door and Hardware Institute

Certification Label - A label placed on a device to indicate compliance to applicable standards. Such labels can include UL, C-UL, CSA, ETL, TUV, etc.

Chain Bolt - A spring bolt actuated by a chain attached to the spring bolt for application at the top of the door

Chain Door Fastener - A device that limits the opening of a door by means of a chain

Changes (Key) - The different bittings or tumbler arrangements in a series of locks

Checking Floor Hinge - A device placed in the floor that combines top and bottom pivots for hanging the door with a controlled speed dosing mechanism

Cipher Lock - A lock that is opened by pressing its buttons in a specific sequence. It differs from a coded lock in that it typically has only 4-5 buttons, and each button can only be pressed once. The cipher lock was the mechanical precursor of today's electronic coded lock with a telephone-like keypad

Classroom-Intruder - Latchbolt is operated by rotating the inside lever, or rotating the outside lever only when not locked from the inside or outside key. Outside lever is locked and unlocked by turning the key inside or outside lever. Inside lever cannot be locked

Classroom Function - The inside knob or lever works at all times, but outside knob or lever works only when not locked by key. BHMA function 08

Clean Room Door Package - A door package that has special seals and characteristics to meet stringent air or particle infiltration specifications

Closer Reinforcement - A reinforcing piece inside of a door or frame. Provides additional strength of attachment of door closers

Coded Lock - A lock that is opened by typing a code on a keypad

Combination Anchor - A device for anchoring a frame to wall constructed with wood or metal stud

Contact - Electrically conductive points, or sets of points, used to make or break an electrical circuit mechanically

Contact Rating - Maximum load rating of a switch, stated in voltage and/or current

Contact Smart Card - A smart card that must make contact with the reader. Compare with contactless smart card

Contactless Smart Card - A smart card that uses RFID technology to enable its use without physical contact with the reader. Maximum distance from the reader is either the proximity range (10 cm. / 4 inches) or the vicinity range (one meter / 3 feet) depending upon which of two RFID standards is used

Continuity Measurement - A test performed on a wire or electrical circuit to verify that there are no open lines or poor connections

Continuous Duty - Refers to a device or a control that can operate continuously with no off or rest periods

Continuous Hinge - A hinge designed to be the same length as the moving part to which it is applied as, for example, the lid covering the keyboard of a piano

Coordinator - A device used on a pair of doors to ensure that the inactive leaf is per mined to dose before the active leaf. Necessary when an overlapping astragal is present and exit devices, automatic or self-latching bolts are used with closers on both door leaves

Credential - A medium that contains encoded information, such as ID cards, key fobs, & smart chips

Cremone Bolt - A device of surface application that, by a turn of knob or lever handle, locks the door or the sash into the frame, top and bottom

Cup Escutcheon - A door plate, for use on sliding doors, having a recessed panel to afford finger hold and to contain a flush ring and sometimes a cylinder, all being flush with the surface of the plate

Current - The flow of electricity through a conductor measured in amps

Cutout (door) - A piercing for hardware, lite, louvers, and/or accessories

Cylinder (of a lock) - The cylindrical-shaped assembly containing the tumbler mechanism and the keyway, which can be actuated only by the correct keys

Cylinder Collar - A plate or ring used under the head of a cylinder

Cylinder Lock - A lock in which the locking mechanism is controlled by a cylinder

Cylinder Screw - The set screw that holds a cylinder in place by preventing the cylinder from being turned after installation

Cylindrical (locks and latches) - A term used to describe bored locks, which have a cylindrical case into which a separate latch bolt case fits

Cylindrical Lock Prep - Cutout (or hole) in a door for bored/cylindrical locksets. Also known as 161 Prep - Cutout (or hole) in a door for bored/cylindrical locksets. Also known as 161 Prep

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D

Data0 (DO) - One of two data lines in Wiegand communications. Data0 (D0) represents the binary "0"

Data1 (D1) - One of two data lines in Wiegand communications. Data1 (D1) represents the binary "1"

DCDB - Abbreviation for "Door Cut Down Bottom" - Cut door undercut

Dead Bolt - A lock component which projects from, and is withdrawn into, the lock case by action of the lock mechanism. When the door is closed and the dead bolt thrown, it extends into the strike, locks the door, and does not release with end pressure

Deadlock - A lock equipped with a dead bolt only

Deadlocking Latch Bolt - A latch bolt incorporating a plunger that is held in a retracted position when a door is dosed, thus preventing the bolt from being retracted by end pressure

Decibel (db) - An increment of measurement used to compare measured levels of sound energy (intensity) to the apparent level detected by the human ear. A sound that has 10 times the energy of another sound is said to be 10 decibels louder; 100 times the energy is 20 decibels louder; 1,000 times the energy is 30 decibels louder and so on. Decibel levels are correctly expressed as the number of decibels at a measured distance from the sourse of sound (for example, 125dB at 10 feet)

Delay On Break - A term used to describe a mode of operation relative to timing devices. The delay begins when the initiate switch is opened (delay on break of initiate switch)

Delayed Egress - An irreversible time delay built in the locking device of an opening preventing immediate egress

Depth of Security - Concentric perimeters of security having different or increasingly stringent access methods. An inner area is protected both by its own access methods and by those of the areas that enclose it and must therefore be entered first

Detector / Sensor (Motion) - A device designed to detect the movement of a person or object in the vicinity of the doorway and signal the door control. Four types are in use today. They are:

Infrared (Active) - A device that emits infrared energy and detects the amount reflected from people. The pattern can vary in size from narrow to wide, depending on design

Infrared (Passive) - A device designed to detect a change in temperature gradient. These devices do not emit any energy, but only detect infrared energy differentials

Microwave Unit - A device that operates on the Doppler radar principle, designed to detect moving people. Microwave units use antennae designed for varying pickup patterns usually described as either wide or narrow. Microwave units are normally either the directional or non-directional type

Visual Image Processing - A device that uses camera (s) along with digital signal processing to detect motion of people within the defined zone of the camera’s field of view

Detector / Sensor (Presence) - A device designed to detect the presence of people in the vicinity of the doorway and send an activating signal to the door control. Four common types are in use today. They are:

Holding Beam - An infrared device used to activate, re-activate, or hold open a sliding door. It is used as a safety device to hold the door open. There are two types on the market. One uses a separate transmitter and receiver, the other uses a transmitter/receiver in one unit with a reflector. Both types use pulsed infrared as the detecting medium

Infrared (Active) - A device that emits infrared and detects the amount reflected from people. The pattern can vary in size from narrow to wide, depending on design. For sensors that are capable of learning different environments, the standard establishes a 30 second minimum learning time

Ultrasonic - A device that uses a transducer or transducers to emit high frequency sound to detect the presence of a person through echolocation. The pattern from a transducer is narrow and precise in range and transducers can be combined to produce a larger detection area

Visual Image Processing - A device that uses camera(s) along with digital signal processing to detect presence of people within the defined zone of the cameras field of view

Diode - An electronic component that will only pass current in one direction. Commonly used in door controls for rectifying AC to DC

Dip Switch - A small type of gang switch used on circuit boards for mode selection. Acronym for a switch that mounts in the same socket of circuit pattern as a Dual-In-Line I.C. that are normally called dual-in-line packages; hence D.I.P.

Dogging - Securing a device in a released/open position

Dogging Device - As used in exit devices, a mechanism that fastens the cross bar in the fully depressed position, and also retains the latch bolt or bolts in a retracted position, thus permitting free operation of the door from either side

Door - A movable panel or leaf used to close an entryway

Door Bolt - A manually operated rod or bar attached to a door providing means of locking

Door Closer Bracket - A device whereby a door closer may be installed on the frame rather than directly on the door

Door Closer or Check - A device combining a spring for dosing and a compression chamber into which the liquid or air escapes slowly, thus providing a means of controlling the speed of the dosing action

Door Holder - A device that holds a door open at selected positions

Door Mounted Sensors - Sensors mounted on the door leaf such that they move with the door

Door Pivot - A hinging device embodying a fixed pin and a single joint. Most types include lateral fastening

Door Stop - A device to stop the swing or movement of a door at a certain point. Also an architectural term defining that part of a door frame against which the door closes

Door Sweep - A weather brush or stripping used on the bottom of a door panel

Double Acting Operator - An operator that is powered when moving in one direction and is capable of moving manually in the other direction in emergency situations

Double Doors - A pair of doors that meet in the middle of the door frame when closed

Double Pole/Double Throw - A term used to describe a switch or relay output contact form (2 form C) in which two separate switches are operating simultaneously, each with a normally open and normally closed contact and a common connection. This form is used to make and break two separate circuits

Double-Throw Bolt - A bolt that can be projected beyond its first position into a second, or fully extended one, thus providing extra security

Drawer Roller - A device used to ease the sliding of a drawer open or shut, usually with a metal or fiber wheel rotating in a metal frame

Drawer Slides - A mechanism employing guides and rollers that guide and support the drawer, permitting easy operation

Drivers - The upper set of pins in a pin tumbler cylinder, which, activated by the springs, project into the plug until raised by insertion of the key

Drop Escutcheon - One having a pivoted plate that covers the key hole

Drop Ring - A ring handle attached to a spindle that operates a lock or latch. The ring is pivoted but remains in a dropped position when not in use

Dry Contact - Metallic points making (shorting) or breaking (opening) a circuit

Drywall Frame - A three piece door frame, installed after a wall has been erected

Dual - Two swinging doors, side by side, in a common header, that operate independently of each other and are separated by a vertical member

Dummy Cylinder - A mock cylinder without any operating mechanism for use where effect is desired

Dummy Trim - Trim only, without lock; usually used on the inactive door in a pair of doors

Dust-Proof Strike - A strike with a spring plunger that completely fills the bolt hole when the bolt is not projected

Dutch Door - A door divided into two parts horizontally, allowing one half to be shut and the other left open

Dutch Door Bolt - Device for locking together the upper and the lower leaves of a Dutch door

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E

Edge Plate - An angle or channel-shaped guard used to protect the edge of a door

Edge Pull - A pull mortised into the edge of a sliding door

Egress - Free access outside from inside

Elbow Catch - A spring-loaded device embodying a rocker arm and angle strike, for locking the inactive leaf of a pair of cabinet locks

Electric Strike - An electric door locking device (usually solenoid-operated) that will unlock the door when electrical power is applied to it. A fail-safe configuration will operate in the reverse condition (i.e., normally locked when power is applied and unlocked when power is interrupted)

Electromagnet - A coil of wire, usually wound on an iron core, that produces a strong magnetic field when current is sent through the coil

Electro-Magnetic Latch Release - A device used in conjunction with a vertical rod exit device on an automatic swinging door to coordinate the automatic door operator with the exit devices. Typically used on fire door applications

Encryption - The reversible transformation of data from its original form to a format which is difficult to interpret. This is a mechanism to protect the confidentiality and integrity of the data and insure integrity. Encryption requires use of an algorithm and one or more encryption keys

End of Line Resistor (EOL) - Resistance in a supervised circuit, usually at the farthest point from the alarm control unit, restricting the flow of current to a known value which is monitored. Shorting the circuit in an attempt to bypass protective devices in the loop (i.e., door contacts) will create increased flow of current and cause an alarm. Opening (breaking) the circuit also triggers an alarm if the system is armed, or a supervisory signal, if the system is disarmed

Entry/Entrance/Office Function - Push button locking. Button on inside locks outside lever until unlocked by key or by rotating the inside lever. Inside lever always free

Escutcheon (Elongated) - A plate long enough to span a lock case and having holes for knob bushing, bit key, cylinder, turn knob and similar operating members as required

Escutcheon (Key) - See Key Plate

Existing Wall Anchor - An expansion bolt sleeve anchor, used to anchor a frame in an existing block wall. A reinforcement bracket and a punch-out & dimple prep through the stop of the frame is required for the sleeve anchor to go through

Exit Device - A door-locking device designed to grant instant exit by pressing on a cross bar that releases the locking bolt or latch

Extended Bypass - The alarm sounds if the door switch (or bar switch) is opened in the armed condition. The key is required to reset the alarm. If the door switch is open, turning the key on, the unit will flash the red light twice. Once the door switch is closed, the unit will go through the arming delay mode and arm

Extension Flush Bolt - A flush bolt in which the connection between bolt head and operating mechanism is by means of a rod inserted through a hole bored in the thickness of the door

Extension Link - A device used to provide long backsets in bored locks

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F

Face (of a lock) - The exposed surface that shows in the edge of a door after installation (See Front)

Facial Geometry - One of the physical traits that can be measured by biometric technology – the relative position of eyes, nose, and mouth on the face

Fail-Safe - A term used to describe an electric lock that has a mechanical state of being unlocked and requires power to lock it. Also known as electrically locked

Fail-Secure - A term used to describe an electric lock that has a mechanical state of being locked and requires power to unlock it. Also known as electrically unlocked

False Acceptance - In biometric identification, the erroneous result of identifying someone who isn’t in the database of known people. It is one of two ways biometric identification can fail; the other is false rejection

False Rejection - In biometric identification, the erroneous result of failure to recognize a known person. It is one of two ways biometric identification can fail; the other is false acceptance

FAR - False Acceptance Rate. For a biometric device, the percentage of readings that are a false acceptance

Fast Pin Hinge - One in which the pin is fastened permanently in place

FCDB - Abbreviation for "Frame Cut Down Bottom" - Cut jamb legs down in height

Filler Plate - A blank plate used to fill mortised cutouts

Finish Builders Hardware - Hardware that has a finished appearance as well as a functional purpose and that may be considered a part of the decorative treatment of a room or building. Also termed Architectural Hardware, Finish Hardware and Builders Finish Hardware

FIPS - Federal information processing standard

FIPS201 - Federal information processing standard for personal identification verification (PIV)

Fire Exit Bolt - See Exit Device

Fire Exit Hardware - Panic hardware which additionally provides fire protection when used as part of a fire door assembly and is labeled by a NRTL and is subject to follow-up inspection service

Fire Lite - A type of ceramic glass used in fire rated doors and frames

Fire Rated Door or Frame - The ability of a door or frames to provide an effective barrier against the passage of flames, smoke and toxic gases and/or to reduce the transmittance of radiated heat

Floor Anchor - See also base anchor

Floor Closer - A closing device installed in the floor under a door

Floor Hinge - A combined pivot hinge and closing device set either in the floor or in the bottom of the door. It may be spring type only or may be combined with liquid control

Flush Bolt - A door bolt so designed that when applied it is flush with the face or edge of the door

Flush Cup Pull - A pull mortised flush into a door, having a ring pull that folds Hat into the cup of the pull

Flush Door - A door without glass and/or louvers

Flush Ring - A flush door pull mortised in a door, having a ring pull that folds flat into the cup of the pull

Foot Bolt - A type of bolt applied at the bottom of a door and arranged for foot operation. Generally the bolt head is held up by a spring when the door is unbolted

Force Gauge - A test device used to measure door opening and closing force

Form C Relay - A switch mechanism which contains three terminal points: Open, Closed, Common

Format - The way that the information (parity bits, facility code and card #) is organized on the credential

Friction Catch - Any catch which when it engages a strike is held in the engaged position by friction

Friction Hinge - A hinge designed to hang a door and hold it at any desired degree of opening by means of friction control incorporated in the knuckle of the hinge

Front (of a lock) - The plate through which the latching or locking bolts project (See Face)

FRR - False Rejection Rate. For a biometric device, the percentage of readings that are a false rejection

Full Glass Door (Design FG) - A design of dor having louvers the entire height and width of the area surrounded by rails and stiles

Full Louver Door (Design FL) - A design of door having louvers the entire height and width of the area surrounded by rails and stiles

Fusible Link Louver - A louver used in fire-rated doors

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G

Gateway - A device for providing isolation and control of the flow of information between a computer and authenticated devices on the network

Glass Stop - Extrusions used to hold the glass in a door leaf

Glazing Bead - Removable trim at a glazed opening to hold glass securely in place

Grand Master Key - A key that operates locks in several groups, each of which has its own master key

Ground Wire - An electrical conductor that leads from a device to an earth ground connection

Guard Bar - A series of two or more cross bars generally fastened to a common back plate to ensure protection of glass or screen in a door

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H

Half Glass Door (Design G) - A design of door having class in upper portion only

Hand - Defines the pivot location or the direction of movement. Certain conventions have been set up and used by the door industry

Hand Scan - A technique for biometric identification that measures three-dimensional hand geometry – the shape of the fingers and the thickness of the hand

Handed/Handing - Depicts the direction a door swings, i.e. from left or from the right

Harmon Hinge - A hinge designed to swing a door into a pocket at a right angle with the frame

Hasp - A fastening device consisting of a loop and a slotted hinge plate, normally secured with a padlock

Header - The main extrusion that forms the top structure of an automatic door and which contains the controls and operators

Hertz (Hz) - The international unit of frequency equal to one cycle per second; named after the German physicist Heinrich Rudolph Hertz (1857-1894)

Hinge - Two plates pined together by a pin and attached to a door and its frame whereby a door is supported and is enabled to swing or move

Hinge Filler Plate - A plate installed in hinge cutout when hinge is not required

Hinge Jamb - A vertical piece of a door frame prepared for installation of hinges

Hinge Stile (of a door) - The stile to which the hinges are applied as distinguished from the lock stile

Hinged Latch Bolt – See Swinging Latch Bolt

Hold-Open Time - The time a door remains fully open after loss of detection

Homerun - A wiring method in which each device has a separate wiring run to the control panel

Horizontal Spring Hinge - A spring hinge mortised horizontally into the bottom rail of a door and fastened to the floor and head frame with pivots

Host Computer - A computer that primarily provides services such as computation, data base access, or special programs and/or services

HSPD - Homeland Security Presidential Directive

HSPD12 - Homeland Security Presidential Directive calling for a mandatory government-wide standard for secure and reliable forms of ID issued by the federal government for access to federally controlled facilities and networks

Hub - The part of a lock through which the spindle passes to actuate the mechanism

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I

I.C. - Acronym for Integrated Circuit. A type of solid stated electronic component used in sensors and controls. Sometimes referred to as a “chip”

I/O - Input/output

iButton® - A microchip similar to those used in smart cards but housed in a round stainless steel button about a half inch in diameter, which can be attached to a key fob or jewelry. iButtons are extremely rugged, but are not available with RFID technology for contactless use

IFPO - International Foundation for Protection Officers. A non-profit organization founded for the purpose of standardized training and certification of protection officers. Its Security Supervisor Training Manual is a reference guide for protection officers and their employers

Inactive Door (or leaf) - That leaf of a pair of doors that does not contain a lock, but is bolted when closed, and to which the strike is fastened to receive the latch or bolt of the active door

Indicator Button - A device used in connection with a hotel lock to indicate whether or not the room is occupied

Induction - An influence exerted by a charged body or by a magnetic field on neighboring bodies without apparent communication; electrifying, magnetizing, or inducing voltage by exposure to a field

Infrared Shadow Card - A type of access control card that has a bar code sandwiched between two layers of plastic. The reader passes infrared light through the card, and the shadow of the bar code is read by sensors on the other side

Ingress - Free access inside from the outside

Inrush - The initial surge of current through a load when power is first applied. Lamp loads, inductive motors, solenoids and capacitive load types all have inrush or surge currents higher than the normal running or steady state currents. Resistive loads, such as heater elements, have no inrush

Insulated Glass (Double Pane) - Glass panes separated by air or gas. The air/gas is trapped between the two pieces of glass and acts as an insulator

Integral (locks and latches) - A term used to describe a type of mortise lock having cylinder in the knob

Interchangeable Core (IC) - Unlike a standard key cylinder, which is accessible for combinating only via locking device disassembly, an interchangeable mechanism relies upon a specialized "control" key for insertion and extraction of the essential (or "core") combinating components

Interlock - A system of multiple doors with controlled interaction. Interlocks are also known as lighttraps, airtraps, mantraps and sally-ports (See safety interlock, security interlock)

Intermittent Duty - A solenoid designed to be energized for short periods of time. Continuous operation may damage an intermittent duty solenoid

Invisible Hinge - A hinge so constructed that no parts are exposed when the door is closed

Iris Scan - A technique for biometric identification that maps the pattern of colors in the iris of the eye

ISO-14443 - A series of international vendor independent standards for proximity RFID that establishes guidelines for two types of smart cards (A & B). The most common application requires a read within 4 inches of the reader and includes Classic MIFARE, EV1, DESFire and PIV

ISO-15693 - A series of international vendor independent standards for vicinity RFID that establishes guidelines for smart cards that can read up to 1.5 meters

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J

Jamb - A vertical piece of a door frame assembly, adjacent to wall

Jamb Depth (Frame Profile) - The overall width of frame profile - face to face dimension

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K

Keeper – See Strike

Key Change - The combination of cuts in a key that enable it to operate the lock for which intendedv

Key Plate - A small plate or escutcheon having only a keyhold (See Drop Escutcheon)

Key Retention - The function in which a lock must be locked before the key can be removed. Also known as Keystop

Key Side - A reference point used to determine outside of door - sometimes required for handing or determination fo secure side of glass bead or louvers

Keyfob - Specific form factor of credential that generally refers to a hard plastic disk that is carried on a key chain

Keystop - A pertusion that prevents a key from moving past a particular point on a locking device

Keyway - The aperture in lock cylinders that receives the key and closely engages with it throughout its length

Keyed Alike (KA) - A keying option which allows for any number of cylinders to operate by the same key

Kick Down Holder - A type of door stop that kicks down to hold the door open; locks in the up position to allow the door to open freely

Kick Plate - A protective plate applied on the lower rail of the door to prevent the door from being marred

Knob - A projecting handle for operating a lock

Knob Shank - The projecting stem of a knob into which the spindle is fastened

Knob Top - That part of the knob that the hand grasps

Knocked Down (KD) Frame - A door frame furnished in three or more parts for assembly in the field

Knuckle - The enlarged part of a hinge into which the pin is inserted

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L

Laminated Glass - A type of safety glass that holds together when shattered

LAN - Local area network

Latch Bolt - A lock component which projects from the assembly in an extended position, but is forced back into the lock case by end pressure or drawn back the mechanism. When the door is closed, the latch bolt engages the strike, and holds the door in the closed position

Latch Guard - See latch protector

Latch Protector - A piece of hardware (attached to door) that completely covers the latch area protecting the latch bolt from prying and shimming. Also known as latch guard

L.E.D. - Acronym for Light Emitting Diodes. A solid state lamp commonly used as an indicator in sensors and controls

Leading Edge - The vertical edge of the door opposite the hinge

Leaf (of a pair of doors) - One of the two doors forming a pair of doors

Letterbox Back Plate - A plate, similar to a letterbox plate, attached to the inside of a door to allow the passage of mail

Letterbox Plate - A date attached to the door with an opening to permit insertion of mail

Levels of Security - The range of security protection, low to high, provided at concentric perimeters – the least secure at the outermost perimeter (such as entry to the building) and the most secure at the innermost perimeter (such as access to a rack)

Lever Handle - A horizontal handle for operating the bolt(s) of a lock

Lever Tumbler - Flat tumbler having a pivoted motion actuated by the turning of the key and controlling the locking function

Light Emitting Diode (LED) - A diode, a solid-state device, that gives off virtually heatless colored light when electric current is passed through it. LEDs are very efficient and long-lasting and are often used for digital readouts and annunciators. Common colors include red, green and amber

Limit Arm - A device used to limit how far a panel can swing when broken out

Line Drop - A voltage loss occurring between any two points in a power or transmission line. Such loss, or drop, is due to the resistance, reactance or leakage of the linev

Linking - When an input changes the state of an output

Lip of a Strike - The projecting part on which the latch bolt rides

Lite - Preparation in a door for view window, vision and/or glazing including glass stop and glazing bead

Lite Kit - A frame inside of a door used to hold glass in place

Lock (electric)

Fail Safe - A lock that is designed to unlock in the event of a loss of power

Fail Secure - A lock that is designed to remain locked in the event of a loss of power

Magnetic (sometimes called Electro-Magnetic) - A lock using a magnetic coil that acts against a steel plate to lock a door

Solenoid - A lock that utilizes a coil and metal plunger to physically lock and/or unlock a door

Lock Rail (of the door) - The horizontal member of a door intended to receive the lock case

Lock Set - A lock, complete with trim, such as knobs, escutcheons or handles

Lock Stile (of a door) - The stile to which the lock is applied as distinguished from the hinge stile

Lockout / Cutoff - Either a function or a device. To “lockout” or cutoff is to disconnect or disable a device

Loose Joint Hinge - A hinge having but two knuckles; the pin is fastened permanently to one knuckle, the other contains the pinhole, whereby the two parts of the hinge can be disengaged by lifting. These hinges are handed

Loose Pin Hinge - A hinge having a removable pin to permit the two parts of the hinge to be separated

Louver - An opening in a door with a series of slats or blades to allow passage of air

Low Energy and Power Assist Doors - Swinging doors that meet the requirements of ANSI/BHMA A156.19

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M

Macro - A defined set of actions or commands that will be executed based on a trigger event

Magnetic Catch - A cupboard catch that uses a magnet to hold the door closed

Magnetic Sensor - A solid-state switch that turns on and off when a magnetic field is passed in front of it

Magnetic Stripe Card - A type of access control card that uses a magnetic strip to store information; read by inserting or swiping through a reader

Magstripe Card - See Magnetic Stripe Card

Manageable Device - Able to be monitored and controlled remotely. Manageable access control devices can communicate with a remote management system for monitoring (who’s coming and going and when), control (configuring the device to allow access to certain people at certain times), and alarm (notification of repeated unsuccessful access attempts or device failure)

Mantrap - An airlock-style arrangement having secured doors for entry and exit, with room for only one person between the doors. It is a solution to the security loophole called piggybacking or tailgating, in which an unauthorized person freely passes a security checkpoint by following an authorized person through an open door

Masking - Hiding or suppressing alarms which do not need to be viewed

Masonry Frame - A frame installed in a new or existing masonry or block opening

Master Key - Operates any quantity of cylinders of different individual key changes

Masterkeying - An arrangement of cylinders having individual key changes, which permits them all to be operated by a simple key called a master key

Masterkey System - An arrangement of cylinders having individual key changes, which permits them all to be operated by one key, called a master key

Meantime-Between-Failure - A prediction of the time interval between system failures. Should be measured in thousands of hours/possibly years

MIFARE® - A contactless and dual smart card chip technology produced by NXP that is fully compliant with ISO-14443

Mission Critical Facility - A facility that must operate 24/7/365 regardless of availability of power/water/fuel/etc. Examples would be corporate data center, 911 dispatch, military facilities

Mono Lock - See Preassembled Lock

Mop Plate - A narrow plate similar to a kick plate, of sufficient height to protect against the swish of the mop

Mortise - A cavity made to receive a lock or other hardware; also the act of making such a cavity

Mortise Bolt - A door bolt designed to be mortised into a door rather than applied to its surface

Mortise Cylinder - Screw in cylinder with a cam tailpiece

Mortise Exit Device - An exit device with the lock mechanism installed into a mortise provided in the edge of a door. Mortise exit devices can be either Panic or Fire Exit Hardware

Mortise Lock/Latch - A lock designed to be installed in a mortise rather than applied to the door's surface

Mortise Lock Prep - Cutout in the edge of a door for mortise lock. Also known as mortise lock prep

Mullion - A vertical member in an opening for two doors permitting each door to be operated and latched independently. The mullion may be removable or fixed

Multi-Meter - An instrument that combines several functions; usually resistance measurement, voltage measurement, and current measurement. This instrument is commonly called a VOM or OHM meter

Muntin - A vertical or horizontal member in a door leaf, other than the top and bottom members

Multi-Technology Credential - A credential that contains two or more technologies (i.e. proximity, smart card, magnetic stripe)

Multi-Technology Reader - A reader with the capability to read two or more card technologies (i.e. proximity, smart card, magnetic stripe)

Mute - See silencer

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N

Narrow Lite Door (Design NV) - Design of door with narrow rectangular lite at lock stile of door

NCPI - Network-Critical Physical Infrastructure. Elements of a data center’s physical infrastructure (as distinguished from IT infrastructure such as routers and storage managers) that contribute directly to availability by ensuring uninterrupted operation. NCPI includes power, cooling, fire suppression, and physical security

NEC - National Electrical Code

Need to Know - A very high level of security, with access restricted to people who have a specific, immediate need to be in the secured area (for access to particular data, for example), with access only allowed for the time period during which that need exists

NIC - Network interface card

Nightlatch - An auxiliary lock having a spring latch bolt and functioning independently of, and providing additional security to, the regular lock of the door

NO/NC - Normally open/normally closed, refers to the normal circuit state of a switch/relay

Non-Extended Bypass - The alarm sounds if the door switch (or bar switch) is opened in the armed condition. The key is required to reset the alarm. If the door is open at the end of the arming delay mode, the device will sound

Non Removable Pin Hinge (NRP) - A hinge with a set screw in its barrel; to prevent the removing of hinge pin. Set screw is not accessible when door is closed. Used with outswinging exterior doors

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O

OHM - Unit of electrical resistance. One OHM is the resistance which allows one ampere of current to flow through a conductor at one volt

Ohm’s Law - Voltage = Current x Resistance

Olive Knuckle Hinge -A paumelle hinge with knuckles forming an oval shape

Overhead Concealed (O.H.C.) - A swinging door header that is above the door and between the jambs, as opposed to a surface mounted header

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P

PAC - Personal Access Code. Another name for PIN (Personal Identification Number) – a code or password that identifies a user at an access point

PACR - Abbreviation for "Parallel Arm Closer Reinforcement" - Welded-in reinforcement, in frame head, for mounting of door closer

Pair Frame - A door frame, to accommodate two doors or a pair

Pair of Doors - See double doors

Panic Bar
- See exit device

Panic Exit Device - See Exit Device

Panic Hardware - A door latching assembly incorporating an actuating member usually called actuating bar which releases the latch bolt(s) upon the application of force in the direction of exit travel

Panic Hardware/Exit Device Types (according to ANSI/BHMA)
Type 1: Rim Exit Device
Type 2: Surface Vertical Rod Exit Device
Type 3: Mortise Exit Device
Type 4: Narrow Stile Rim Exit Device
Type 5: Narrow Stile Surface Vertical Rod Exit Device
Type 6: Narrow Stile Concealed Vertical Rod Exit Device
Type 7: Wood Door Concealed Vertical Rod Exit Device
Type 8: Metal Door Concealed Vertical Rod Exit Device
Type 9: Combination Rim and Surface Vertical Rod Exit Device
Type 10: Narrow Stile Mortise Exit Device
Type 11: Combination Mortise and Surface Vertical Rod Exit Device
Type 12: Combination Mortise and Concealed Vertical Rod Exit Device
Type 21A: Door Coordinator with Override Feature
Type 21B: Door Coordinator without Override Feature
Type 22: Removable Mullion
Type 23: Concealed Automatic Latching Two Point Bolts
Type 24: Surface Automatic Latching Two Point Bolts
Type 25: Automatic Extension Flush Bolt
Type 27: Self-latching Extension Flush Bolt Set
Type 28: Rim Exit Device incorporating a Dead Bolt

Panic Hardware/Exit Device Functions (according to ANSI/BHMA)
01: Exit only, no trim or blank escutcheon
02: Entrance by trim when actuating bar is locked down
03: Entrance by trim when latch bolt is released by key. Key removable only when locked
04: Entrance by trim when latch bolt is released by key or set in a retracted position by key
05: Entrance by thumb piece. Key locks or unlocks by thumb piece
06: Entrance by thumb piece only when released by key. Key removable only when locked
07: Entrance by thumb piece. Inside or outside key locks or unlocks thumb piece. Outside key releases latch
08: Entrance by knob or lever. Key locks or unlocks knob or lever
09: Entrance by knob or lever only when released by key. Key removable only when locked
10: Entrance by knob or lever. Inside or outside key locks or unlocks knob or lever. Outside key releases latch
11: Entrance by control turnpiece. Key locks or unlocks control
12: Entrance by control turnpiece only when released by turning key. Key removable only when locked
13: Entrance by key or combination lock
14: Entrance by trim when latch bolt is released by knob or lever. Always active, no cylinder
15: Entrance by trim when latch is released by thumb piece. Thumb piece always active, no cylinder
16: Entrance by trim when latch is released by control turnpiece. Turnpiece always active, no cylinder
17: Entrance by control turnpiece. Inside or outside key locks or unlocks turnpiece. Outside key releases latch

Paracentric - A term used in connection with cylinder plugs having projections on the sides of the keyway that extend beyond the vertical center line of the keyway

Passage Function - Doors do not lock. There is no key cylinder and no means to lock a passage set. BHMA function 14

Paumelle - A style of hinge embodying a single pint of the pivot type, generally of modern, or streamlined design

Physical Security - Protecting physical facilities from accidents or sabotage caused by the presence of unauthorized or ill-intentioned people. A physical security system includes access control devices for automated screening at entry points, plus a sensor-based alarm system. Additional protection may include camera surveillance and security guards

Piano Hinge - See Continuous Hinge

Piggybacking - The security breach that occurs when an authorized person, having unlocked a door using legitimate credentials, holds the door open for an unauthorized person to follow through the checkpoint with no credentials. (See Tailgating)

PIN - A code or password that identifies a user at an access point

Pin Tumblers -Small sliding pins in a lock cylinder, working against coil springs and preventing the cylinder plug from rotating until the pins are raised to the proper alignment by bitting of key

PIV - Personal identification verification

Pivot - See Door Pivot

Plug (of a cylinder) - The round part containing the keyway and rotated by the key to transmit motion to the bolt(s)

Pocket Door - A door that is prepared to slide into a pocket built in the wall

Potentiometer (POT) - An electronic device used to vary electrical voltage. These are present in many controls as adjustments to vary range, sensitivity, speed, or timing

Power Assist Close (P.A.C.) - A swinging door that has a spring to close the door; but, in addition, applies a low voltage to the motor to assist in closing or holding closed a door in the case of wind load or extra heavy doors. This type of control may keep a low voltage on the motor at all times, even when the door is closed. The term ”power boost” is sometimes used to describe this system

Power Open - Power Close (P.O.P.C.) - A door that both opens and closes under power

Power Open - Spring Close (P.O.S.C.) - A door that opens under power but is closed by a spring

Preassembled Lock - A lock that has all the parts assembled as a unit at the factory, and when installed in a rectangular notch cut into the door edge, requires little or no disassembly

Prison Lock - A heavy lock designed especially for use on jail cells

Privacy Function - Outside knob/lever locked by pushbutton on inside knob/lever. Rotating inside knob/lever or closing door releases/unlocks button. Emergency release in outside knob/lever

Proximity Credential - An access control card that has an onboard RFID transmitter/receiver, allowing it to communicate with a reader from a distance of up to one meter (3 feet). Typically 125KHz frequency

Prox Card - See Proiximity Credential

Proximity Smart Card - A smart card that has RFID technology in its chip, so that it can communicate with the reader from a distance of up to 10 cm. (4 inches). Also called a contactless smart card. Typically 13.58MHz frequency

Push Bar - A horizontal bar surface applied to a door leaf

Push Plate - A plate applied to the lock stile to protect the door against soiling and wear

PVD - Process of applying a coating/finish on a product with positive vapor

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Q

Quadrant (Dutch Door) - A device to fasten together the upper and the lower leaves of a Dutch door

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R

Rabbet - A term used to describe the abutting edges of a pair of doors or windows so shaped as to provide a tight fit. One half of the edge projects beyond the other half, usually 1/2. Also used to define that portion of a door frame into which the door fits

Rabbeted Lock/Latch - A lock in which the face conforms to the rabbet found on a rabbeted door

RACR - Abbreviation for "Regular Arm Closer Reinforcement" - Welded-in reinforcement, in frame head, for mounting of door closer

Rail (of a door) - A horizontal member that pins the stiles. May be exposed as in a paneled door, or concealed as in a flush door

Rectifier - A solid state electrical device that will allow current to flow in one direction. It is designed to convert AC current to DC current

Reed Switch (aka Magnetic Switch) - A switch made up of two metal reeds. This switch is closed or opened by a magnetic field. These are usually encased in either a tubular or rectangular plastic housing

Reinforcing Unit - A metal box-shaped reinforcement for use in a metal door in which a bored lock is to be installed. It provides both vertical and horizontal latch support

Relay - An electro-mechanical device that enables several circuits to be switched simultaneously under the command of a single signal. There are many types and sizes. Some common ones are S.P.S.T. (Single Pole Single Throw), S.P.D.T. (Single Pole Double Throw), D.P.S.T. (Double Pole Single Throw), and D.P.D.T. (Double Pole Double Throw). Relays are rated in terms of coil voltage, contact current ratings, and contact voltage ratings

Removable Mullion - A mullion which can be temporarily taken out of opening to allow the passage of large objects through the opening

Resistor - An electronic component that resists current flow. There are various types and power ratings. The value is expressed in OHMs and the rating in watts. They also have tolerances

Retinal Scan - A technique for biometric identification that maps the pattern of blood vessels in the retina of the eye

Return - The return leg at the back of frame profile

Reveal - The distance from the surface of a swinging door leaf to the mounting surface of the operator

Reverse Bevel - See Bevel

Reversible Lock - A lock which, by reversing the latch bolt, may be used by any hand. On certain types of locks, other parts must also be changed

REX - A request-to-exit device used as an input on an access control system to signal authorized egress

RFID - Radio frequency identification. Communication between card and reader without physical contact. RFID technology is what makes proximity cards, vicinity cards, and contactless smart cards work. The RFID chip is powered by an electromagnetic field from the reader

Rigid Lock - See Preassembled Lock

Rim - A term indicating articles of hardware designed for application to the surface of doors and windows

Rim Cylinder - Cylinder often used with exit devices because of long cut able tailpiece for outside key control trim that inserts into device

Rim Exit Device - An exit device with the latching mechanism applied to the face of a door. Rim exit devices can be either Panic or Fire Exit Hardware

Roller Latch - A friction door latch employing a roller latch head under spring tension, which engages a strike having a recess formed to receive the roller

Roller Strike - A strike having a rolling member at the point of latch bolt contact to minimize friction

Rose - A trim plate attached to the door under the knob. It sometimes acts as a knob bearing

Rough Opening - The size of a wall opening into which frame is to be installed

Rounded Front - A lock or bolt front conforming to the rounded edge of a double acting door. The standard radius is 4" (101.6 mm)

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S

Safety Interlock - A multidoor system in which all doors are normally closed and unlocked. Opening any door will lock all other doors

Sash Balance - A spring device used to counterbalance the weight of a window sash or other vertical sliding part

Sash Center - A pivoted support for transom or sash and comprised of two parts, one of which contains a pivot, the other a socket for the pivot

Sash Chain - A metal chain adapted for use with sliding sash, attached to the sash and to the counterbalancing sash weight

Sash Cord - Cord or rope used similarly to sash chain and in place of chain

Sash Cord Iron - A small metal holder inserted in the edge of the sash, to which sash cord or sash chain is attached

Sash Fast - A fastener attached to the meeting rail of double-hung windows

Sash Lock - A sash fast with a locking de vice controlled by a key

Sash Pole - A wood or metal pole to which a sash pole hook is attached

Sash Pole Hook - A metal hook attached to a wooden or metal pole used to lower or raise a transom or sash beyond hand reach

Sash Pulley - A pulley mortised into the frame of a double-hung sash frame over which the sash cord or sash chain passes

Sash Socket - A metal plate containing a hole or cup to receive a sash pole hook

Sash Weight - A weight used to balance sliding sash, usually of cast iron or, if conditions require, of lead

Screen Door Latch - A small locking or latching device used on screen doors and operated by a knob or a lever handle

Screwless Knob - A knob attached to a spindle by means of a special wrench as distinguished from the more commonly used side knob screw

Screwless Rose - A rose with concealed method of attachment

SDK - Software Development kit

Secret Gate Latch - A surface-applied latch operated by a concealed button or other device; usually used on office gates

Security Interlock - A multidoor system in which all doors are normally closed and locked. Opening any door will will disable the door releases of all other doors

Self-Closing - When a door must close on its own, with the assistance of closing hardware. Properly installed door closers or spring hinges will make a door self-closing. Self-closing doors are required for fire rated openings

Self-Latching Flush Bolt - A flush mounted locking device for the inactive leaf of a pair of doors that latches automatically and unlatches manually

Shank (of a knob) - The projecting stem of a knob into which the spindle is fastened

Shelf Pin - A pin for supporting a shelf; also called a shelf support or shelf rest

Shunt - Length of time that an input will be masked

Shutter Operator - A device incorporating a hinge and a method of opening or closing a shutter by means of a crank or turn from inside without opening window

Shutter Worker – See Shutter Operator

Side Knob Screw - A set screw used to fasten a knob to a spindle

Sidelite Frame - The same as a borrowed lite except that it is attached to a door frame

Sight Line - The continuation of various horizontal extrusions on a door and its adjoining walls

Signal Sash Fastener - A sash fastening device to lock double-hung windows that are beyond reach from the floor. It has a ring for a sash pole hook. When locked, the ring lever is down; when the ring lever is up, it signals by its upright position that the window is unlocked

Silencer - A rubber part attached to the stop on a frame to cushion the closing of a door

Sill (Frame) - The bottom horizontal piece of a borrowed lite or sidelite frame

Simultaneous Pair - Two swinging doors, side by side, in a common header, without a separator, that always operate together

Single Pole/Double Throw (SPDT) - A term used to describe a switch or relay contact form (1 form C) that has a normally open and a normally closed contact with a common connection

Single Pole/Single Throw (SPST) - A switch with only one moving and one stationary contact, available either normally open (NO) or normally closed (NC)

Single Acting Operator - An automatic door operator that moves in a single direction in the closed position and cannot move in the opposite direction

Smart Card - A type of access control card that stores information in a microchip. The chip not only stores data, but can perform computation and exchange data with the reader. It is read by touching the card to the reader so that the electrical contacts line up. See also contactless smart card

Smart Media - Small objects of any shape that contain the same type of chip used in a smart card. Smart media are typically small objects (tokens) that can be attached to a key ring or worn as jewelry

Social Engineering - The use of ordinary guile and deceit to con people into relaxing security procedures – for example, such as revealing passwords, lending keys, or opening doors

Solid-State Relay - A relay that is a solid-state switch rather than an electro-mechanical device. This type of relay requires power to perform its switching, and it has no moving parts

Spindle (of a knob) - The bar or tube connected with the knob or lever handle that passes through the hub of the lock or otherwise engages the mechanism to transmit the knob action to the bolt(s)

Split Astragal - An astragal that is split through the middle, allowing each door leaf to operate independently

Spring Hinge - A hinge containing one or more springs to move the door into the de sired position. It may be either single or double acting

Spring Open - Power Close (S.O.P.C.) - A door that opens under spring tension and closes under power. Useful for smoke evacuation system applications

Stile (of a door) - A vertical member of the door structure; each door has two, a lock stile and a hinge stile

Stop (of a lock) - The button, or other small device, that serves to lock the latch bolt against the outside knob or thumb piece or unlock it if locked. Another type holds the bolt retracted

Store Door Handle - A heavy grip or pull mounted on sectional or elongated plates and provided with a thumb piece to operate the latch trip of a store door lock

Strap Hinge - A surface hinge of which one or both leaves are of considerable length

Strike - A metal plate or box that is pierced or recessed to receive the bolt or latch when projected

Surface Applied - A door header that is applied to the wall or frame surface

Surface/Concealed - Mounted on exterior existing material/ mounted inside a wall/ header to be out of sight

Surface Hinge - One having both leaves surface applied

Swinging Latch Bolt - A bolt that is hinged to a lock front and is retracted with a swinging rather than a sliding action

Swing-side (sometimes called the Safety-side) - A term used to describe the side of a swinging door that encompasses the swing path

Switch, Maintained - A switch that, when activated, maintains its activated position until it is unactivated

Switch, momentary - A switch that, when activated, automatically returns to its original position afterwards

Swivel Spindle - A spindle having a joint midway in its length to permit the knob at one end to be made rigid by the stop works while the other end is free to operate

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T

T Handle - A cross handle for actuating the bolt of a lock and used in place of a knob

T Hinge - A surface hinge with the short member attached to the jamb and the long member attached to the door

Tailgating - The security breach that occurs when an unauthorized person slips past a checkpoint undetected, by following an authorized user through an open door. (See also piggybacking)

Tamper - A digital input which monitors the status of a device, typically the door of an enclosure

Telescoping Slider - Two or more leaves slide in the same direction to arrive at the full open position at the same time

Template - In biometrics, a computed transformation of a scan – still unique to the individual but taking up much less storage. It is the template, not the raw scan, that is stored in a database of users or on the chip of a smart card, for comparison to a live scan taken at an access point

Template Hardware - A term indicating any item of hardware that is made to template; that is, exactly matching the master template drawing as to spacing of all holes and dimensions

Thimble - The socket or bearing attached to an escutcheon plate in which the end of the knob shank rotates

Three-Point Lock - A device sometimes required on three-hour fire doors to lock the active leaf of a pair of doors at three points

Threshold - A strip fastened to the floor beneath a door, usually required to cover the joint where two types of floor material meet

Threshold (Biometrics) - In biometrics, the user-adjustable parameter that can be used to adjust the two failure rates (false acceptance and false rejection). Since it represents “How close is close enough?” decreasing one of the failure rates automatically increases the other

Threshold Sensors - Presence sensors used to detect a person in the space between two non-overlapping zones in the threshold area

Throw (of a deadbolt or latch bolt) - Measurement of the maximum projection when bolt is fully extended

Thumb Piece (of a handle) - The small pivoted part above the grip of a handle to be pressed by the thumb to operate a latch bolt

Time Schedules - Consists of time ranges that are associated with days of the week or holidays, and are often used with access levels or as trigger events

Token - A small object with a microchip that carries your personal identifying information. The token is touched to a reader, or simply brought within range if it includes RFID capability

Transceiver - A term usually applied to the microwave transmitter/receiver module in a microwave motion sensor

Transducer - A term used to describe a device that emits energy. Usually an ultrasonic transmitter/receiver

Transformer - A device that can either reduce or increase electrical voltage. In the automatic door industry, it is usually used as a method to reduce voltage

Transistor - A three lead solid-state device used in electronics as either a switch or an amplifier. These can be low power units or high power units requiring heat sinks

Transom Bar - That part of a door frame that separates the top of a door or a window from the bottom of the transom

Transom Catch - A fastener applied to a transom and having a ring by which the latch bolt is retracted

Transom Chain - A short chain used to limit the opening of a transom; usually provided at each end with a plate for attachment

Transom Lift - A vertically operated device attached to a door frame and transom by which the transom may be opened or closed

Trigger - An event or manual action that will cause another event or execution of a macro

Trim - Trim is composed of both operating and non-operating decorative elements and includes knobs, levers, pulls, roses, escutcheons, lock fronts, strikes, actuating bars, turns, thumb pieces, vertical rods, cylinder assemblies, and covers

Tubular Lock (or Latch) - A type of bored lock

Tumbler - A guard or obstruction that pre vents operation of a bolt except by insertion of the proper key

Turn - The component that projects or releases a bolt or latch bolt by turning. Sometimes called a turnpiece

Turn Piece - A small knob, lever or tee turn with spindle attached for operating the deadbolt of a lock or a mortise bolt

Two-Point Latch - A device sometimes required on three-hour fire doors to lock the inactive leaf of a pair of doors at top and bottom

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U

Unit Lock - See Preassembled Lock

Universal - A term used to describe a lock, a door closer or other device that can be used on doors of any hand without change

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V

VA - An acronym for the term ”Volt-Ampere.” This term is used to indicate the power capacity of a transformer. For example a 40 VA transformer can supply 40 VA of power without exceeding its capacity

Vertical Rod Exit Device - An exit device with top and bottom latching mechanism, applied to the face of the door or concealed inside the door connected by rods to the actuating mechanism. Vertical rod devices are permitted to be supplied without bottom latching mechanism. Vertical rod exit devices can be either Panic or Fire Exit Hardware

Vertical Spring Pivot Hinge - A spring hinge mortised into the heel of a door and fastened to the floor and head with pivots

Vicinity Card - An access control card that has an onboard RFID transmitter/receiver, allowing it to communicate with a reader from a distance of up to one meter (3 feet)

Voice Print - In biometrics, a digital representation of a user’s voice used for comparison with the user’s live speech at an access point

Volt/Amp (VA) rating - The product of rated input voltage multiplied by the rated current. This establishes the "apparent energy" available to accomplish work

Voltage Drop - A term used to indicate reduction of voltage through a conductor over a specified distance

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W

WAN - Wide area network

Ward - An obstruction projecting from the lock case of side of a keyhole intended to prevent entrance or rotation of an improperly cut key

Watt - The common unit of electrical power. One watt is dissipated by a resistance of one ohm through which one ampere flows

Wattage - A measure of power consumption

Wiegand Card - A type of access control card that uses imbedded work-hardened wire (Wiegand wire) to hold information read by swiping it through a reader

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