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" (1040mm) or more from the bottom.

Armored Front

A lock that consists of two plates: the under plate is fastened to the case and is unfinished; 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)

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 the door somewhere between 60 degrees and 85degrees of opening. Designed to protect an object behind 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 measurement from the edge of the door to the center point of the 2-1/8" holes through the door.
Ball-Bearing Hinge	A hinge equipped with ball bearings between the hinge knuckles to reduce friction. (See Anti-Friction Bearing). Mainly used for heavy doors for ease of opening.
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). If otherwise detailed, it must be so noted in ordering locks.
Bevel (of a lock front)	Anti-reflective glass is float glass with a specially-designed coating which reflects a very low % of light. It offers maximum transparency and optical clarity, allowing optimum viewing through the glass at all times.
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.
Bit (of a key)	The projecting blade, cut in a manner that actuates the tumblers and permits the lock bolts to be operated.
Bitting	The number(s) which represent(s) the dimensions of the key cut (s) or the actual cut(s) or combination of a key bitting depth; the depth of a cut which is made into the blade of a key
Bitting Position	The location of a key cut on the blade
Bored Lock (or Latch)	Lock or latch whose parts are intended for installation in holes bored in a door.
Bottom Pin	Cylindrically shaped tumbler, which may be conical, ball shaped, or chisel pointed on the end which makes contact with the key
Bow	The portion of the key which serves as a grip or handle
Box Strike	A strike that also provides a complete housing to protect the bolt openings.
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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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, for example, the lid covering the keyboard of a piano.
Conversion Kit	Allows flexibility to adapt handlesets and deadbolts to fit 2" or 2-1/4" thick doors.
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 self-latching 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 sash into the frame, top and bottom.
CTC (center-to-center)	The vertical measurement from the center point of the bottom through hole to the center point of the top through hole. Applicable for handlesets only.
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.
Cut Key	A key which has been bitted or combined (cut to code)
Cylinder (of a lock)	The cylindrical-shaped assembly (complete operating unit) containing the tumbler mechanism and the keyway (plug, shell, tumblers, springs and actuating device), into which the key is inserted to operate a lock and can only be actuated by the correct key.
Cylinder Collar	A plate or ring used under the head of a cylinder.
Cylinder Collar Spacer	For use with deadbolts to accommodate 1-3/8" thick doors.
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.

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DBLC	A Baldwin term indicating double cylinder function
Deadbolt (of a lock)	A lock bolt having no spring action nor bevel, and which is operated by a key or a turn piece. Locking mechanism. Metal bolt which slides from door into frame preventing the door from opening. Security feature for exterior doors.
Deadlock	A lock equipped with a deadbolt 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 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 Hand	A term to describe the direction a door swings, for example, right hand (RH), left hand (LH), right hand reverse (RHR) or left hand reverse (LHR).
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 Stile	The stile is the frame (edge) of the door where the handle is mounted. The width of the stile is critical in properly fitting hardware on a door.
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 Thickness	The measured thickness of a door – required to determine certain components of door hardware. For example, 1-3/8” standard residential interior, 1-3/4” standard residential exterior.
Double Cylinder Entrance Handleset	Deadbolt operated by key from either side; no turn knob. Frequently used when door has glass panes.
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, when 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 Door	The inactive door in a pair of doors, as in French doors.
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.

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Edge Bore	The hole drilled into the edge of the door to hold lock or latch.
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.
Emergency Egress	Term used to describe a lock function that allows simultaneous retraction of both deadbolt and latchbolt by operating the interior door knob or lever.
Emergency Entry Key	A small device which allows the homeowner to unlock a bedroom or bathroom knob/lever from the exterior.
Emergency Exit Entrance Set	Handleset which retracts the latchbolt and deadbolt simultaneously when the inside lever is turned. Provides quick exit in emergency situations.
ENTR	A Baldwin term indicating single cylinder function.
Entrance (ENTR)	A term which indicates a keyed single cylinder function.
Escutcheon (Elongated)	A decorative backplate, generally larger than 6" in height, on which a knob, lever, or pull is mounted. 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.

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Face (of a lock)	The exposed surface that shows in the edge of a door after installation. (See Front)
Face Bore	The hole drilled through the door, front to back, to hold knob or lever.
Fast Pin Hinge	One in which the pin is fastened permanently in place.
FD	A Baldwin term indicating fully dummy function (back to back – interior/exterior)
Finish	Refers to the color and protective coating of the item.
Finish Builders' Hardware	Hardware that has a finished appearance as well as a functional purpose and that may be considered a part ot 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.)
Full Dummy	D�corative handleset, lever, or knob used on the non-working door of a double door unit. Full dummy trim is on both sides of the inactive door.

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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.
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Half Dummy	A single knob or lever for a non-latching door. Half dummy is only used on outside of the door. Most commonly used for a push/pull application or on a closet door that does not have a latch.
Hand (of a lock, etc.)	Indicates the direction of swing or movement, and/or locking security side of a door and is determined by standing on the outside of the door.
Handed (locks, etc.)	Indicates that the article is for use only on doors of the designated hand.
Handleset	Term describing a lock trim with a handle and thumbpiece on the exterior of the door, and a knob/lever on the interior.
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. Types: invisible, ball bearing, radius corner and butt hinge.
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.

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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 a cylinder in the knob.
Invisible Hinge	A hinge so constructed that no parts are exposed when the door is closed.

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KA1, KA2, KA3 etc	Keyed alike symbol indicating that all cylinders so designated are to be operated by the same key(s).
Keeper	See Strike
Key Blank	A key manufactured to the proper size and configuration allowing its entry into the keyway of a specific locking device, but has not yet been cut, or bitted, to any code.
Key Change	The combination of cuts in a key that enable it to operate the lock for which intended.
Key Code	Keys and locks cut to a specific code.
Key Plate	A small plate or escutcheon having only a keyhold.
Keyed Entry Lockset	Entrance lockset which is locked by a key from exterior and thumbturn from interior. Can be either a knob or lever.
Keyed Alike	More than one lock can be operated by the same key. For example, you may open a number of exterior doors with the same key.
Keyed Different	Term describing groups of locks with a key code that is different from the others.
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.

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Latch Bolt	A beveled spring bolt, usually operated when either the knob or lever is turned, or when the thumbpiece which operates the handleset is pushed down.
Leaf (of a pair of doors)	One of the two doors forming a pair of doors.
Left Hand Door	If hinges are on the left side of the door when viewing from the outside, door is left handed.
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.
LHRH	A Baldwin term which indicates both left and right hand levers are included with product in single cylinder lockset.
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.
Lock Trim	The components of a lockset installed on the interior and exterior surfaces of the door, i.e. door knobs/levers, escutcheon plates, roses, handle, etc.
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.
LRDB	A Baldwin term which indicates both left and right hand levers are included with product in double cylinder lockset.
LRFD	A Baldwin term which indicates both left and right hand levers are included with product in dummy lockset.

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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
Master Key System	A keying arrangement which has 2 or more levels of keying.
Minus Rose (MR)	A term describing a door knob/lever without any rosettes (rose).
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 which is mortised into the edge of a door which combines the two functions normally required on a door; latching and bolting (deadbolt).
Mullion	A fixed or movable post dividing an opening vertically.

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

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Olive Knuckle Hinge	A paumelle hinge with knuckles forming an oval shape.
Overhead Concealed Closer	A closer concealed in the head frame with an arm connecting with the door at the top rail.

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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.
Passage Function (Hall/Closet)	Knob or lever set most commonly used in hallways where a locking feature is not required.
Patio	A term describing a lock which locks the exterior side of a door but has no keyed access from the exterior.
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 Follower	A tool used to allow removal of the cylinder plug while retaining the top pins, springs, or other components within the shell.
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 parts assembled as a unit at the factory and which, when installed in a rectangular notch cut into the door edge, requires little or no disassembly.
Pre-Drilled Hole	Term describing a door which has been bored for standard hardware prep; usually a 1” edge bore, 2-1/8” side bore @ 2-3/8” or 2-3/4” backset.
Prison Lock	A heavy lock designed especially for use on jail cells.
Privacy Function (Bed/Bath)	Knob or lever set most commonly used in bathroom or bedroom; can be locked from the inside with a push button emergency release feature.
Push Plate	A plate applied to the lock stile to protect the door against soiling and wear.

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Quadrant (Dutch Door)	A device for fastening the upper and the lower leaves of a Dutch door.

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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 (or Latch)	A lock in which the face conforms to the rabbet found on a rabbeted door.
Radius Hinge	Full mortise hinge with rounded (radius) corners.
Rail (of a door)	A horizontal member that joins the stiles. May be exposed as in a paneled door, or concealed as in a flush door.
Reinforcing Unit	A metal, box-shaped reinforcement used in a metal door in which a bored lock is to be installed to provide both vertical and horizontal latch support.
Re-Key	To change the existing combination (code) of a cylinder or lock.
Reverse Bevel	See Bevel
Reversible Lock	A lock which, by reversing the latch bolt, can be used by either hand. On certain types of locks, other parts must also be changed.
Right Hand Door	If hinges are on the right side of the door when viewing from the outside, door is right handed.
Rigid Lock	See Preassembled Lock
Rim	A term indicating articles of hardware designed for application to the surface of doors and windows.
Rim Lock	A type of lock which is surface mounted on the interior of a door with all functions inside of the lock. It does not require the door edge to be bored.
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 decorative backplate for knobs and levers, often round- or oval-shaped. The trim plate is attached to the door under the knob. It sometimes acts as a knob bearing.

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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 a 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 device 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.
Secret Gate Latch	A surface-applied latch operated by a concealed button or other device; usually used on office gates.
Sectional Lock Trim	A lock trim consisting of a pair of knobs/levers, with roses, a cylinder and cylinder collar, and a thumb turn. No escutcheon plate.
Shank (of a knob)	The projecting stem of a knob into which the spindle is fastened.
Shear Line	The location inside of a cylinder or lock at which specific tumbler surfaces must be aligned in order for the key to turn the lock mechanism.
Shelf Pin	A pin for supporting a shelf; also called a shelf support or shelf rest.
Shutter Operator (also called a Shutter Worker)	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.
Side Knob Screw	A set screw used to fasten a knob to a spindle.
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.
Single Cylinder Entrance Handleset	Key operates deadbolt from outside; turnpiece operates deadbolt from the inside.
Single Dummy	A knob/lever surface mounted on the interior or exterior of a door which does not turn any mechanism.
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 desired position. It may be either single or double acting.
Stile	Horizontal measurement from the edge of the door to the edge of the bead or glass.
Stile (of a door)	A vertical member of the door structure; each door has two: a lock stile and a hinge stile.
Stop Buttons	Mechanism on a mortise lock that allows the exterior trim to be locked, while the interior remains unlocked.
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 on which one or both leaves are of considerable length.
Strike Plate	The component of a lock or latch that is installed on the door jamb, into which the latchbolt or the deadbolt extends. Usually made from brass and matches the finish of the hardware.
Style	The appearance of the handleset, deadbolt, knob or lever design.
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. Sometimes called Hinged Latch Bolt.
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 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.
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.
Throw (of a deadbolt or latch bolt)	Measurement of the maximum projection when bolt is fully extended.
Thumbpiece or Thumbturn	Lock trim component which typically is used to lock a deadbolt from the interior side of a door.
Transmission Case	Round housing mounted on the back of the outside handle. Converts up and down motion of thumb piece to a twisting motion so latch can be operated.
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.
Tubular Lock (or Latch)	A type of bored lock.
Tumbler	A guard or obstruction that prevents operation of a bolt except by insertion of the proper key.
Turnpiece	A small knob, lever or tee turn with spindle attached for operating the deadbolt of a lock or a mortise bolt. Also termed Thumb Turn. Used only on single cylinder operations.
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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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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Vertical Spring Pivot Hinge	A spring hinge mortised into the heel of a door and fastened to the floor and head with pivots.

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

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