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 G L O S S A R Y O F T E R M S A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All Active Door (in a pair of doors) The leaf that opens first and the one to which the lock is applied.
AHC Indicates that the individual so identified is a qualified Architectural Hardware Consultant and member of the Door and Hardware Institute.
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.
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.
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.
Armor Plate A plate similar to a kick plate but covering the door to a greater height, usually 40" (1 040mm) or more from the bottom.
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.)
Auxiliary Dead Latch A supplementary latch that automatically deadlocks the main latch bolt when the door is closed. (Also called Deadlocking Latch Bolt.)
Back Check Optional feature in hydraulic door closers slowing the opening swing of door somewhere between 600 and 850 of opening. Designed to protect an object behind the door. Not intended to act as an overhead stop.
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.)
Backset (of a hinge) The distance from the edge of the door to the hinge.
Ball-Bearing Hinge A hinge equipped with ball bearings between the hinge knuckles to reduce friction. (See Anti Friction Bearing.)
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" (3.2mm in 50.8mm) It otherwise detailed it must be so noted in ordering locks. Bevel (of a lock) A term used to indicate the direction in which the latch bolt is inclined: regular bevel for doors opening in, reverse bevel for doors opening out.
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.
Bit (of a key) The projecting blade, cut in a manner that actuates the tumblers and permits the lock bolts to be operated.
Bored Lock (or Latch) Lock or latch whose parts are intended for installation in holes bored in a door
Box Strike A strike that also provides a complete housing to protect the bolt openings.
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.
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.
Case (of a lock) The box containing the lock mechanism.
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.
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 controlledspeed closing mechanism.
Continuous Hinge (also called Piano 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 permitted to close before the active leaf. Necessary when an overlapping astragal is present and exit devices, automatic or selflatching bolts are used with closers on both door leaves.
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.
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.
Cylindrical(locks and latches) A term used to describe bored locks, which have a cylindrical case into which a separate latch bolt case fits.
Cylinder Screw The set screw that holds a cylinder in place by preventing the cylinder from being turned after installation.
Deadbolt(of a lock) A lock bolt having no spring acton nor bevel, and which is operated by a key or a turn piece.
Deadlock A lock equipped with a cleadbolt only
Deadlocking Latch Bolt A latch bolt incorporating a plunger that is held in a retracted position when a door is closed, thus preventing the bolt from being retracted by end pressure.
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 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 closing and a compression chamber into which the liquid or air escapes slowly, thus providing a means of controlling the speed of the closing action.
Door Holder A device that holds a door open at one or more selected positions.
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,
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(or Key Plate) One having a pivoted plate that covers the keyhole.
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.
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 Bolt Device for locking together the upper and the lower leaves of a Dutch door
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.
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 electrical device that permits releasing of the door from a remote control.
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.
Exit Device A door-locking device designed to grant instant exit by pressing on a cross bar that releases the locking bolt or latch.
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.
Face (of a lock) The exposed surface that shows in the edge of a door after installation. (See Front.)
Fast Pin Hinge One in which the pin is fastened permanently in place.
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' Hardware.
Fire Exit Bolt See Exit Device.
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 flat into the cup of the pull.
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.
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.)
Grand Master Key A key that operates locks in several groups, each of which has its own master key
Guard Bar A series of two or more cross bars generally fastened to a common back plate to insure protection of glass or screen in a door.
Hand (of a lock, etc.) A term used to indicate the direction of swing or movement, and/or locking security side of a door.
Handed (locks, etc.) A term used to indicate that the article is for use only on doors of the designated hand.
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.
Hinge Two plates joined 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 Stile (of a door) The stile to which the hinges are applied as distinguished from the lock stile.
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.
Hub The part of a lock through which the spindle passes to actuate the mechanism,
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.
Integral (locks and latches) A term used to describe a type of mortise lock having cylinder in the knob.
Invisible Hinge A hinge so constructed that no parts are exposed when the door is closed.
Keeper Synonymous with Strike.
Key Change The combination of cuts in a key that enable it to operate the lock for which intended.
Key Plate A small plate or escutcheon having only a keyhold
Keyway The aperture in lock cylinders that receives the key and closely engages with it throughout its length.
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.
Knuckle The enlarged part of a hinge into which the pin is inserted.
Latch Bolt A beveled spring bolt, usually operated by a knob, handle or turn.
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 plate attached to the door with an opening to permit insertion of mail.
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.
Lip of a Strike The projecting part on which the latch bolt rides.
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.
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.
Magnetic Catch A cupboard catch that uses a magnet to hold the door closed.
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.
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 Lock (or Latch) A lock designed to be installed in a mortise rather than applied to the door's surface.
Mullion A fixed or movable post dividing an opening vertically
Nightlatch An auxiliary lock having a spring latch bolt and functioning independently of, and providing additional security to, the regular lock of the door.
Olive Knuckle Hinge A paumelle hinge with knuckles forming an oval shape.
Overhead Concealed Closer A closer concealed in the head frame with an armconnecting with the door at the top rail.
Panic Exit Device See Exit Device.
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
Paumelle A style of hinge embodying a single joint of the pivot type, generally of modern, or streamlined design.
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.
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).
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.
Push Plate A plate applied to the lock stile to protect the door against soiling and wear.
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