NG&G Facility Service, Int'l.
Access Door: Entryway, for service purposes, to closed area where sliding wall panels stack.
Active Door (or leaf): First operating door of a pair, when unlocking; the door usually equipped with cylinder control for locking mechanism.
Aesthetics: The science and philosophy of beauty.
Air Lock Strip: The weather-stripping attached to the edges of each wing of a revolving door.
All-Glass Door: See Glass Door
Anchor: Any device used to secure a building part or component to adjoining construction or a supporting membert. See also Floor Anchor and Jamb Anchor.
Anoxic Coating: The surface finish resulting from anodizing. Coatings may be produced by clear, integral color or electrolytically deposited color processes.
Anodize: To give an aluminum oxide coating by electrolytic action.
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.
Armored Face Plate: Tamper-proof faceplate or front of a lock mortised in the edge of a door to cover the lock mechanisms.
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. Usually for weatherstripping purposes (Also See Coordinator.)
Automatic Operator: Power-operated door activating device and control, actuated by approaching traffic or remote switch.
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: A resistance to cushion and slow down the opening swing of a door before reaching the door swing limit. Designed to protect an object behind the door. Not intended to act as an overhead stop.
Backset (of a lock): Distance from vertical centerline of leading edge of lock stile of door to centerline of lock cylinder, measure parallel with door face.
Backset (of a hinge): The distance from the stop side face of door to edge of hinge cut-out on both door and frame.
Backset (of a door): Dimension from plane of face of door to plane of face of frame.
Backset (Flushbolt): Distance from the outside of the face plate to the inside surface of mounting tabs.
Back Stop: A mechanical feature of a door closer which completely stops the opening swing of a door at a pre-set position.
Ball-Bearing Hinge: A hinge equipped with ball bearings between the hinge knuckles to reduce friction (See Anti-Friction Bearing.)
Balanced Door: A door equipped with double-pivoted hardware so designed as to cause a semi-counterbalanced swing action when opening.
Barrier Free: The elimination of barriers or obstructions to permit ready access to and through entrances for those who are confined to wheelchairs or otherwise physically handicapped.
Beam: A horizontal, weight-supporting member of a structural frame.
Bevel: A sloped or canted surface contiguous with a vertical or horizontal one.
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.
Bite: See Edge Cover.
Bituminous: Describing cement, mastic, or roofing, indicating a product in which asphalt is a major ingredient.
Blocking: Internal members of wall furring, or the like; to afford fastening rigidity for the outside shell.
Bookfold: All four or three wings of a revolving door folded so that they are parallel and point in the same direction.
Bored Lock (or Latch): Lock or latch whose parts are intended for installation in holes bored in a door
Bottom Arm: The arm mechanism attached to the bottom rail of a door and connecting to the spindle of a floor closer or pivot.
Box Strike: A strike that also provides a complete housing to protect the bolt openings. (Also See Strike)
Brake Shape: Sheet stock bent or "broken" to desired shape, as required by a specific job, on a power or manual brake machine. This shape is often used to cover conditions which cannot be covered by stock shape.
Breakaway Mechanism: See Collapsing Mechanism.
Builders Hardware: See Architectural Hardware.
Bulkhead: The member of an entrance frame which forms a base for a sidelite.
Bull-Nose: Convex rounding of a member, such as a radius face plate.
Bumper Bar: See Guard Bar.
Butt (Hinge): A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame.
Butt-Hung Door: A meeting of two members squarely end-to-end.
Cam (of a cylinder): A rotating piece attached to the end of the cylinder plug to engage the locking mechanism.
Camber: A slight raising from a plane to gain an actual or apparent effect or arching.
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.
Casing: Door or window trim encasing a structural member.
Caulk, or Calk: To fill cracks and crevices, chiefly along the intersection of wood or metal with masonry, using a non-hardening putty-like compound often applied from a pressure gun.
Cement Casing: the pan installed in the floor to house the floor bearing and/or operator of a revolving door or the floor mounted operator or closer for a swing door.
Center-Hung Door: A door hung on center pivots.
Center-Pivot: Swing hardware having its pivot axis on the thickness centerline of the door and normally located about 2-3/4" from the hinge jamb.
Center Shaft: The vertical shaft to which the wings of a revolving door are fastened.
Channel: A rolled form of structural steel in varying sizes, each having a straight web with equal right-angled flanges on both edges on the same side of the web.
Chase: A rough channel formed in the inner face of wall to receive piping, wiring, or duct-work and keep it behind the finished surface.
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.
Check: See Door Closer.
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.
Clearance: See Door Clearance.
Clipped Canopy: See Revolving Door Canopy.
Closer: See Door Closer.
Coefficient of Expanision: A value denoting the rate at which a material expands with rising temperature.
Collapsing Mechanism: The revolving door mechanism, top and bottom, that allows the door to turn properly and breakaway when required.
Column: A supporting pillar.
Continuous Hinge (also called Roton Hinge): A hinge designed to be the same length as the moving part to which it is applied.
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.
Cope: To join two molded strips at an angle by fitting one over the other, instead of mitering.
Corner Bracket: A bracket which is connected to a door frame jamb and head at the upper hinge corner to support an exposed overhead door closerd. Used only on out-swinging doors.
Corner Post: A glass-holding mullion which connects two plate of glass at an angle, forming a corner.
Cover Plate: A finish plate used to cover the exposed face of a floor closer not covered by the threshold; also, a plate used to cover the exposed face of a closer mounted in the hed of a door frame or a section of threshold over a door closer.
Crash Bar: The cross bar of a panic exit device, serviing as a push bar to activate the panic hardware.
Crash Bar Housing: The housing at either end of a crash bar which is mounted on the surface of a door.
Cremone: A locking device consisting of two long rods, the ends of which engage at sill and head.
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. There are two different types of cylinders: Mortise type -- which has a threaded surface which screws directly into a lock case, with a cam which engages the lock mechanism. Rim type -- which is mounted on the surface of a door, usually by screws from the reverse side, it is mounted independantly of the lock and engages with the lock mechanism by means of a tail piece or metal extension.
Cylinder Cam: See Cylinder.
Cylinder Collar: A plate or ring used under the head of a cylinder.
Cylinder Guard: Hardened protective shield to prevent pulling of 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 Ring: The spacing collar to accomodate longer cylinders.
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 action nor bevel, and which is operated by a key or a turn piece.
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.
Deadstop: See Backstop.
Division Bar: A resilient member used vertically or horizontally, supporting light-weight building materials when combined with a structural element.
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, permitting free operation of the door from either side.
Door Backset: See Backset.
Door Bolt: A manually operated rod or bar attached to a door providing means of locking.
Door Buck: A door frame of rough material to which the finished door frame is attached.
Door Clearance: The margin of clearance around the edge of a door, between door and frame.
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 Frame: The assembly of members into which a door fits when closed, consisting of jambs and head but no sill.
Door Holder: A hardware device designed to limit the swing of a door and hold it open at selected positions.
Door Lite: The glass area in a glazed door.
Door Opening: The opening dimension of a doorway, measured from inside of jambs and from floor line to underside of head of frame. The opening size is usually the nominal door size, and is equal to the actual door size plus clearances and threshold height.
Door Pivot: A hinging device embodying a fixed pin and a single joint. Most types include lateral fastening.
Door Size (actual): a) For swing doors, the actual width and height of the door leaf itself. b) For revolving doors, the inside diameter of the enclosure walls and the height from floor to underside of ceiling.
Door Size (nominal): See Door Opening.
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: See Sweep Strip.
Double Acting Door: A door equipped with hardware which permits it to swing in both directions from the plane of its frame.
Double-Throw Bolt: A bolt that can be projected beyond its first position into a second, or fully extended one, thus providing extra security.
Dress Plate: See Cover Plate.
Drip: The projection of a vertical surface beyond a lower one in a parallel plane, with undercut edge to drip rainwater.
Drip Mold: A molding shaped for drip.
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 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.
Drum: The curved sides of the enclosure, either glass or sheet metal, of a revolving door.
Dry Glazing: A method of securing glass in a frame by use of a dry, preformed resilient gasket, without the use of a compound.
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 Blocks: Continuous or short lengths of elastomeric materials located at both jambs of the frame for centering the glass in the framed opening and for preventing laterial "walking..." They also protect the glass from being nicked during installation.
Edge Clearance: The dimension between the edge of glass or panel and its surrounding frame, measured normal to the edge in the plane of the glass or panel.
Edge Cover: The dimension by which the inner edge of the frame or stop overlaps the edge of the glass or panel.
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: A path of exit.
Electric Strike: An electrical device that permits releasing of the door from a remote control.
Electrolysis: Chemical decomposition of metal surfaces by action of dissimilar metals and moisture.
Emergency Release: A safety device other than panic hardware which permits egress under emergency conditions.
Enclosure Wall: The curved wall components of a revolving door.
Entrance: The doorway, vestibule or lobby through which one enters a building.
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. (Also See Panic Exit Hardware)
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
Extruded: Formed by forcing platic materials or metal through a shaped opening.
Facade: A face of a building, usually the front.
Face (of a lock): The exposed surface that shows in the edge of a door after installation. (See Front.)
Face Clearance: The dimension between the face of a lite of glass or panel and the nearest face of its retaining frame or stop, measured normal to the plane of glass or panel.
Fast Pin Hinge: One in which the pin is fastened permanently in place.
Fencer: One who repairs fences.
Filmer: One who applies film/tint to windows.
Finger Guard: A closure strip of soft material such as rubber or plastic, which is applied at the edge of a door or to the pivot jamb adjacent to the door, to prevent damage to hands or fingers inserted between door and frame.
Finish 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.
Fire Exit Bolt: See Exit Device.
Floor Anchor: A metal device attached to the back of a door frame jamb at its base, to secure the frame to the floor. It may be either fixed or adjustable in height.
Floor Check: See Floor Closer.
Floor Closer: A door closing device which is installed in a recess in the floor under a door to regulate the opening and closing swing of 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. (See Also Floor Closer, which is the preferred term)
Floor Pivot: A center of offset pivot which is located at the at the floor or threshold.
Flush Bolt: A rod or bolt which is mounted flush with the edge or the face of the inactive door of a pair, to lock the door to the frame at head and/or sill. When mounted in the edge, operation is by means of a recessed lever. (See Surface Bolt).
Flush Cup Pull: A pull mortised flush into a door, having a ring pull that folds flat into the cup of the pull.
Flush Glazing: A methold of setting glass whereby glazing beads are recessed within and flush with the edge of the frame.
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.
Frame: An assembly of members surrounding and supporting a door or doors and perhaps adjacent sidelites, also transom lites.
Free Standing: Structurally independent of an adjacent wall or other background, as a free-standing column.
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.)
Gator: One who repairs gates.
Glass Door: A door with no stiles in which glass forms the structure. Provision is made for mounting on hinges or pivots.
Glass Stop: A glazing bead which is either applied to, or is an integral part of the frame.
Glaze: To install glass lites or infill material.
Glazier: One who installs glass.
Glazing Bead: A light member applied to a frame or door stile or rail to hold glass or infill in a fixed position.
Glazing Compound: A soft, dough-like material used for filling and sealing the spaces between a lite of glass and its surrounding frame and/or stops.
Glazing Gasket: A performed elastomeric or plastic material applied between the face of the glass or panel and the framing to provide resilient support between the glass or panel and the framing and to prevent the passage of air and water. Gaskets are normally used alone but in some installations may be used in conjunction with a supplemental application of sealant.
Grand Master Key: A key that operates locks in several groups, each of which has its own master key.
Guard Bar: A protective bar applied to the lower portion of a door or sidelite to prevent accidental contact with glass.
Hair-Line Joint: The fine line on contact between abutting members, with a maximum joing width of 1/64".
Hand (of a lock, etc.): A term used to indicate the direction of swing or movement, and/or locking security side of a door.
Hand (of a door): The designation of direction of swing of door. Viewed in plane, a clockwise swing inward is right hand, and outward is left hand reverse; a counter-closkwise swing inward is left hand, and outward is right hand reverse.
Handed (locks, etc.): A term used to indicate that the article is for use only on doors of the designated hand.
Handicap Hardware: Hardware designed specifically to accommodate the needs of the physically handicapped and to provide for ease of operation of doors and accessibility.
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.
Head, or Header: The horizontal frame member which forms the top of a frame.
Hinge: Two plates pinned 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.
Hold-Back Feature: A mechanism on a latch which serve to hold the latchbolt in a retracted position.
Holder: See Door Holder.
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.
Infill: Various material glazed into a framing system.
Inside Radius: The distance from the center of the unit to the inside of the revolving door drum.
Integral (locks and latches): A term used to describe a type of mortise lock having cylinder in the knob.
Intermediate Pivot: A jamb mounted alignment and/or reinforcing offset pivot located between the top and bottom offset pivots on a door.
Invisible Hinge: A hinge so constructed that no parts are exposed when the door is closed.
Jamb: The vertical frame member forming the side of a door frame or opening. The hinge jamb is the jamb at which the hinges or pivots are mounted; the lock jamb is the jamb at the leading edge of the door, where a lock bolt may be engaged.
Jamb Anchor: A metal device inserted in the back of a metal frame to anchor the frame to the wall. A masonry anchor is used in masonry walls, a stud anchor in a wall built with wood or metal studs.
Keeper: Synonymous with Strike.
Keyed-Alike Cylinders: Cylinders operated by the same key (not to be confused with master-keyed cylinders).
Keyed-Different Cylinders: Cylinders requiring individual keys for their operation.
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 keyhole.
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.
Knuckle: The enlarged part of a hinge into which the pin is inserted.
Latch: See Lock.
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.
Letter Slot: See Mail Slot.
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.
Lintel: A horizontal structrual member spanning an opening at its head to carry construction above the opening.
Lip of a Strike: The projecting part on which the latch bolt rides.
Lock: a) Deadlock: A lock in which a bolt is moved by means of a key or thumb turn, and is positively stopped in its projected position. b) Latch: A mechanism having a spring-activated beveled latch bolt but no locking device. Retraction of the latch bolt is by lever handle or by knob. c) Deadlatch: A latch bolt having an auxiliary feature which prevents its retraction by end pressure when in projected position. d) Deadlock and Latch: A hardware item containing both a deadbolt and latch bolt.
Lock Faceplate: The exposed plate which sets in the edge of a door to cover locking mechanism.
Lock Rail (of the door): The horizontal member of a door intended to receive the lock case.
Lockset: 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 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.
Mail Slot: An opening provided in a door, sidelite or adjacent construction for the insertion of mail. (Size and location usually governed by the Postal Code).
Master Key: Operates any quantity of cylinders of different individual key changes.
Master Keying: An arrangement of cylinders having individual key changes, which permits them all to be operated by a simple key called a master key.
Medium Stile: See Stile.
Meeting Stile: The stiles which meet when a pair of doors are closed.
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.
Muntin: A secondry member separating lites of glass or infill material.
Narrow Stile: See Stile.
Nightlatch: An auxiliary lock having a spring latch bolt and functioning independently of, and providing additional security to, the regular lock of the door.
Offset Pivot: A pin-and-socket hardware device with bearing contact by means of which a door is suspended in its frame, allowing it to swing about an axis which is normally located about 3/4" out from the door face.
Overhead Closer: a) Surface Type -- an exposed door swing control and closer device mounted on the surface of a door and frame at its head. b) Semi-Concealed Type -- a door swing control and closing device mortised into the door top rail and/or frame head. c) Concealed Type -- a door swing control and closer device enclosed within the door top rail and/or frame head.
Panic Bar: See Crash Bar
Panic Device: See Exit Device.
Panic Device Case: See Crash Bar Housing.
Panic Exit Hardware: A door locking mechanism designed to be always operable from the interior by pressure on a crash bar or lever. a) Mortise type -- panic exit hardware having the lock mechanism mortised into the edge of the door or concealed within the door. b) Rim type -- panic exit hardware having the lock mechanism mounted on the push side of the door. c) Vertical Rod type, surface or concealed -- panic exit hardware having latches in or on the top and/or bottom of the door, which are activated through the crash bar by a rod linkage extending vertically on or in the door stile.
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.
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.
Pull Hardware: A fixed handle or grip used to pull a door open.
Push Hardware: A fixed handle or grip used to push a door open.
Push Plate: A plate applied to the lock stile to protect the door against soiling and wear
Quadrant (Dutch Door): A device to fasten together the upper and the lower leaves of a Dutch door.
Rabbet: A term used to describe the abutting edges of a pair of doors 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.
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
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
Removable Mullion: A mullion separating door openings, designed to permit its temporary romoval.
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.
Revolving Door: A door consisting of leaves, usually three or four in number, mounted at equal angles to each other on a common vertical pivot axis with their outer edges in sweeping contact with the building floor, a flat ceiling and two opposed curved enclosure walls, each of which extends through slightly more than the 90 degree arc of a circle.
Revolving Door Canopy: That circular part of a revolving door between the ceiling sheet and the roof sheet. Any canopy that has a flat side and is not a complete circle is referred to as a clipped canopy.
Roller Latch: A hardware device for holding a door in closed position. It consists of a spring-loaded roller mortised into the edge of a door so as to engage with a grooved strike mortised into the frame jamb.
Roller Strike: See Strike.
Rigid Lock: See Preassembled Lock.
Rim: A term indicating articles of hardware designed for application to the surface of doors and windows.
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.
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).
Saddle: See Threshold.
Sash: An assembly of light-weight members framing the perimeter of a lite of glass.
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.
Sealant: An elastomeric material with adhesive qualities used to seal joints or openings against the passage of air and water.
Setting Blocks: Small pieces of neoprene, lead or other material which are used to support a piece of glass within a frame.
Shank (of a knob): The projecting stem of a knob into which the spindle is fastened.
Side Jamb Pivot: See Intermediate Pivot.
Side Lite: A fixed lite of glass located along side a door.
Side Knob Screw: A set screw used to fasten a knob to a spindle.
Single Acting Door: A door mounted to swing in one direction only from the plane of its frame.
Sill: The bottom horizontal frame member.
Soffit Bracket: A bracket for mounting an exposed overhead door closer to the underside of a door frame head or transom bar; used for outswinging doors only.
Spacers: Continuous or short lengths of elastomeric material placed around the periphery of one or both sides of the glass at the edges, between the glass and its frame, to hold the glass in proper plane.
Speed Control: The mechanism that controls the rate of speed at which a door will operate.
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.
Stiffener: A reinforcing member which serves to limit the deflection of the member to which it is attached.
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.
Stop: See Also Door Stop or Glass Stop.
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.
Store Front Sash: An assembly of moulding members forming a continuous frame for a fixed glass store front.
Strap Hinge: A surface hinge of which one or both leaves are of considerable length.
Strike: An opening or retaining device provided in the head, jamb or threshold of a door frame or in the edge on an inactive door to receive a lock or latch bolt. (also referred to as a Keeper or Srike Plate). a) Box Strike -- a strike consisting of a face plate with rectangular opening and a box-like enclosure attached to the back of the plate and surrounding the opening. b) Dustproof Strike -- a strike which is placed in the floor, sill or threshold of an opening, to receive a flush bolt, and is equipped with a spring-loaded follower to cover the recess and prevent its filling with dirt. c) Electric Strike -- a strike used with a latch bolt and designed to be actuated by a remotely controlled electro-magnet, to permit the door to be opened without retracting the latch. d) Roller Strike -- a strike for latch bolts, having a roller mounted in the lip to reduce friction.
Strike Plate: See Strike.
Structural Gasket: A synthetic rubber gasket designed to engage the edge of glass or panel in a surrounding frame by forcing an interlocking filler strip into a grooved recess in the face of the gasket. Such gaskets are structurally capable of transmitting wind and dead loads from the glass or panel to the frame.
Sub-Buck: See Sub-Frame.
Sub-Frame: A supporting structural frame installed prior to and concealed by a finished door frame.
Surface Bolt: A rod or bolt mounted on the face of a door to lock it to the frame. It is operated manually.
Surface Hinge: One having both leaves surface applied.
Sweep Strip or Door Sweep: A weatherstrip mounted at the top or bottom edge of a swing door.
Swing: The direction of opening of a swing door (same as Hand of Door).
Swing of Wings: The arc of travel of the wings of a revolving door beyond the enclosure walls.
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.
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: A master pattern or scaled drawing showing all dimensions and hole spacing for hardware application.
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.
Thermal Break: An element of low heat conductivity incorporated in an assembly of metal parts to reduce the flow of heat across the assembly.
Thimble: The socket or bearing attached to an escutcheon plate in which the end of the knob shank rotates.
Thin Stile: See Stile.
Tinter: See filmer.
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.
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.
Thumbturn: A permanently attached small lever which, when turned, operates the bolt on a lock in the same manner as a key.
Transom: The frames area immediatly above a door opening which contains fixed glass or an operating sash.
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 Bracket: A bracket used to support an all-glass transom over an all-glass door when the latter hs no metal rail and no transom bar is used.
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.
Trim Hardware: Decorative finish hardware used to operate functional hardware or the door itself.
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
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.
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.
Vertical Spring Pivot Hinge: A spring hinge mortised into the heel of a door and fastened to the floor and head with pivots.
Walking Beam Pivot: A form of retractable top center-hung pivot.
Wall Post: The end components of the enclosure walls of a revolving door.
Ward: An obstruction projecting from the lock case of side of a keyhole intended to prevent entrance or rotation of an improperly cut key.
Weep Hole: A hole for drainage, as through a retaining wall or at the bottom of a parapet.
Wet Glazing: The sealing of glass or other panel material in a frame by use of a glazing compound or sealant.
Wide Stile: See Stile.
Wing: One of the rotating leaves of a revolving door.
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