Glossary of Hardware Terminology

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 - Abbreviations

ABRASIVE: Hard granular material of varying fineness, used in grinding and/or polishing, or incorporated with metal to provide a non-slip surface.

ACTIVE DOOR (IN A PAIR OF DOORS): The leaf that opens first and the one to which the lock is applied.

ADDENDUM: Changes made to the specification.

ADJUSTABLE KEY: A key for sliding door locks, having a stem or adjustable shank to adjust the key to doors of various thicknesses.

ALCOVE: A recessed space connected with, or at the side of, a large room.

ALLOY: The combination of two or more metal elements to achieve special strength, hardness of appearance characteristics.

ALTERNATES: A bid process by which additions and deletions are made to a set of drawings and specifications.

ALUMILITE: A trade name used by Aluminum Co. of America for its clear or color-impregnated anodized finishes on aluminum.

ANCHOR: A metal piece used to attach building members to masonry.

ANCHOR HINGE: Butt-type hinge with extended angle plates on one or both leaves, which are mortised (anchored) into top edge of door and/or header.

ANNEAL: To heat metal, glass or other materials above the critical or re-crystallization temperature, then cool, to eliminate the effects of color working, relieve internal stresses or improve electrical, magnetic or other properties.

ANODIC COATING: The surface finish resulting from anodizing. See Anodize.

ANODIZE: To provide a non-corrosive oxide film on the surface of a metal, particularly aluminum by electrochemical action.

ANTI-FRICTION BEARING: Bearing used in a hinge for the purpose of reducing friction and improving efficiency. Normally balls, oil-impregnated or other anti-friction material is used.

ANTI-FRICTION LATCHBOLT: The latchbolt of a lock that has been equipped with a device for lessening friction between bolt and strike. May be a small trigger attached to the bolt that contacts the strike and exerts a lever action to depress the bolt (three-piece latchbolt). May also be a latchbolt with some form of nylon insert or surface.

APPROVED SCHEDULE: Schedule reviewed by the architect and stamped as approved.

ARCH: A curved structure that carries the weight over an opening.

ARCHITECT: A person who plans buildings and oversees their construction.

ARCHITECTURAL FINISH HARDWARE: Functional hardware with a finished appearance. A part of the decorative treatment of the building and its rooms.

ARMORED FRONT: An additional front, applied to the regular front of a lock by machine screws, which protects the cylinder set screws, so that they cannot be loosened without removing the armored front. The armored front need not be applied until after the door has been painted, thus giving the additional advantage of preserving the finish during painting operations.

ASTRAGAL: A member of combination of members applied to one or both doors of a pair at their meeting edges. The astragal closes the clearance gap for the purpose of either providing a weather seal, minimizing the passage of light between the doors or retarding the passage of smoke or flame during a fire. Some types overlay, others meet at the centerline of the gap (sometimes referred to as a "split astragal").

AUXILIARY DEADLATCH: A supplementary latch, which, when the door is closed, automatically deadlocks the latchbolt against end pressure. It does not interfere with the normal operation of the lock.

AUXILIARY LOCK: A lock having a latchbolt or a deadbolt operated by a key or a thumbturn, or both. This lock often is used in addition to another lock, which may or may not be key operated, but which has a latchbolt operated by knobs or levers.

BACKCHECK: Optional hydraulic feature that prevents the door from opening too fast and damaging the closer or anything else in its path. Backcheck usually takes place about 15 degrees before maximum degree of opening is reached.

BACKFILL: Earth replaced around a foundation.

BACKSET (OF A LOCK): A term used in referring to the horizontal distance from the face of the lock to the centerline of the cylinder, keyhole or knob hub. On locks with beveled fronts, this distance is measured from the center of the lock edge. On locks with rabbeted fronts it is measured from the lower step of the center of the lock face.

BAITING: A number that represents a depth of a cut on a pin tumbler-type key. A baiting is often expressed as a series of numbers and/or letters that designate all the cuts on a key.

BALCONY: A platform projecting from the wall of a building, above the ground.

BALL-BEARING HINGE: A hinge equipped with ball bearings between the hinge knuckles to reduce friction.

BARREL: That portion of a hinge that is enlarged to receive the pin and act as the pivot point. It includes one or more knuckles from each individual leaf.

BARREL KEY: A key with a round shank and wing bit. The shank has a hole in the end, which is inserted in the lock. Used chiefly for cabinet locks.

BASEBOARD: The finishing board covering a wall where it meets the floor.

BASEMENT: The lowest story of a building partially or entirely below ground.

BATTEN: A strip of board for use in fastening other boards together.

BEAM: A horizontal structural member that carries a load.

BEARING PARTITION: A partition supporting any vertical load in addition to its own weight.

BENCHMARK: A reference point used by surveyors to establish lines and grades.

BEVEL OF DOOR: The angle of the edge of the door in relation to the inside and outside surfaces of the stile. Thin doors are not usually beveled. The commonly used bevel for heavier doors is 1/8" in 2". (A beveled edge on a thick door is necessary for a close fit when the door is closed because of the arched swing of the door.)

BI-FOLD: Folding doors consisting or pairs of door panels, which fold out of the way to access an opening.

BIT KEY: A key with a solid cylinder shank, stem and wing bit. The wing bit may be tapered, flat or curved. Bit keys are available in a variety of sizes.

BLOCKING: Small, wood framing members.

BOND: Mortar bond between mortar and masonry units structural bond between widths; pattern bond for decorative effect.

BORED DEADLATCH: A lock-fitting round bored openings in the face and edge of a door and having a deadlatch operated by a key or thumbturn, or both.

BORED DEADLOCK: A lock-fitting round bored openings in the face and edge of a door and having a deadbolt operated by a key or thumbturn, or both.

BORED LOCK (OR BORED LATCH): A lock or latch installed into a drilled or bored opening a door. As tubular or cylindrical lock.

BOX STRIKE: A strike containing a housing in the back to enclose the bolt opening in the frame. May be a separate piece from the strike. Metal frames usually have a box already built into the strike area to protect it from mortar and cement.

BRIGHT FINISH: A term used to describe builders' hardware that is polished and buffed to achieve a mirror-like surface.

BUFFING: The process of providing a lustrous finish by means of power-operated soft fabric wheels coated with a wax compound containing fine, abrasive particles.

BUILDERS' HARDWARE: All hardware used in building construction, both finish and rough See Architectural Hardware, Rough Hardware.

BUILDING LINE: An imaginary line on a plot beyond which a building may not extend.

BUILD-UP BEAM: A beam constructed of smaller members fastened together with the grains parallel.

BURNISHING: The process of developing a smooth lustrous surface on metal parts by tumbling in a drum with small steel balls or by rubbing with hard metal pads.

BUTT HINGE (OR BUTT): A hinge mortised into both the door and frame.

BUTT WELD: A weld of members butting against each other.

BUTTON-IN-KNOB: An inside knob with a built-in-button that controls the locking and unlocking of the outside knob. May be either push button or turn button.

BY-PASS: Doors, which slide past each other to access an opening.

CABINET LOCKS: Includes a variety of applications such as school lockers, store display cases, panels, desk drawers, showcases, letter boxes, sliding doors, wardrobe doors, file cabinets, chests, luggage and trunks, metal boxes, cupboards and others.

CAM (OF A CYLINDER): A piece attached to the end of the cylinder plug. As the proper key turns the cylinder plug, the cam is rotated. This, in turn, moves the bolt or other locking mechanism.

CANOPY: A sheltering roof.

CARBON STEEL: An alloy of iron and carbon, with varying small proportions of other materials such as manganese, silicon and copper.

CASE (OF A LOCK): The box containing the mechanism.

CASE HARDEN: To produce a hard surface layer on steel by a process of heating, then cooling the metal.

CASEMENT: A window whose frame is hinged at the side.

CASING: The framing around a door or window.

CAULKING: A waterproof material used to seal cracks.

CAVITY WALL: A masonry wall having an air space of about 2".

CEMENT: A masonry material purchased in a form of a highly pulverized power, usually medium gray in color.

CEMENT CASE: Plastic or cast iron case that is set into the finished floor.The closer is then fastened to the case, allowing the closer to be removed easily from the floor.

CENTER HUNG: Center hung closers locate the pivot in the center of the door opening and require a frame applied stop at 0 degrees in single acting applications.

CENTER PIVOT: A special type of hanging device for heavy-duty doors that usually swing both ways (double acting).

CENTER-TO-CENTER: Measurement from the center of one member to the center of another.

CHANGE KEY: A key that operates an individual cylinder. Also called "day key" or " individual key."

CHANNEL: A standard form of structure rolled steel, consisting of three sides at right angels in channel form.

CIRCUIT: The path for an electric current.

CLEARANCE:A space intentionally provided between building parts, either to facilitate operation or installation, to insure proper separation, to accommodate dimensional variations or for other reasons.

COLD ROLLED: A term applied to metal sheet or plate that has been brought to final thickness and finish by being passed, unheated, between heavy rollers.

COLD WEATHER FLUID: Special cold weather closer fluid used in extreme cold to prevent the closer from freezing.

COLUMN: A vertical supporting member.

COMBINATION LOCKER LOCK: Combines a combination dial with key operation, which permits the lock to operate either with the combination or master key.

COMPOSITE WALL: A masonry wall of at least two adjacent widths of different materials.

COMPRESSIVE STRENGTH: Resistance to a force ending to crush the material.

CONCEALED HINGE: A hinge so constructed that no parts are exposed when the door is closed.

CONCRETE: A masonry mixture of Portland cement, sand, aggregate and water in proper proportions.

CONDENSATION: Water formed by warm, moist air contacting a cold surface.

CONDUIT: A pipe or trough that carries water, electrical wiring, cables and so forth.

CONSTRUCTION MASTER KEY (CMK): A key normally used by builder personnel for a temporary period during construction. It operates all key cylinders designated for its use. The owner permanently voids this key when he accepts the building or buildings form the contractor.

CONTINUOUS HINGE: A hinge designed to extend for the length of the moving part to which it is applied. Also called "piano hinge."

CONTROL JOINT: A joint to divert cracking in a masonry wall. Formed by raking mortar from a continuous vertical joint.

COORDINATOR: A device used on a pair of doors to insure that the inactive leaf closes first, before the active leaf. Necessary when an overlapping astragal is present, with certain exit device combinations and when automatic or self-latching bolts are used. Both door leaves must have closers.

COPING: A masonry cap on top of a wall to protect it from water penetration.

CORE: The proportion of a mold used to form the hollow interior of a casting during the casting process.

CORNER BRACKET (DOOR CLOSER BRACKET): A bracket that is connected to a doorframe jamb and head at the upper hinge corner, to support an exposed overhead door closer.

CORNICE: The part of a roof that extends or projects beyond the wall: the architectural treatment thereof, as a "box cornice."

CORROSION: The deterioration of metal by chemical or electrochemical action resulting from exposure to weather, moisture, chemicals or other agents. A form of oxidation.

COURT: An open space surrounded partly or entirely by a building.

CLOSER SIZE: A term used to describe the strength of a door closer. Generally, the greater the door width, the larger the closer size should be.

CLOSING/LATCH SPEED: The cycle of closing from initial degree to about 10 degrees from closing position. This cycle is controlled by valve to speed up or slow down the closing of the door.

CRAWL SPACE: The space between the floor joists and the surface below when there is no basement. This is used to make repairs on plumbing and other utilities.

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.

CUPOLA: A small structure built on top of a roof.

CURTAIN WALL: An exterior wall that provides no structural support.

CURVED-LIP STRIKE: A strike with lip curved to conform to the detail of the door casing.

CUTS: An indentation or notch made in a key that enables it to turn. It may be either square or rounded. In tumbler locks, the cuts align the tumblers properly to allow the key to rotate. In warded locks, the cuts clear the wards and allow the key to rotate.

CYLINDER: The part of a lock that contains the tumbler mechanism and keyway. The cylinder will permit only the correct key to enter and turn, thus operating the locking mechanism.

CYLINDER RING (OR CYLINDER COLLAR): A collar or washer that fits snugly around the head of a cylinder. It enhances the appearance of the installation, and in some cases, protects the cylinder from tampering.

CYLINDER SET SCREW: The setscrew in the front of a lock that prevents the mortise cylinder from being removed after installation.

CYLINDRICAL LOCK: A type of bored lock. The locking mechanism is usually contained within a cylindrical case, and actuated by a cylinder and/or a button in the knob.

DEADBOLT: A lock bolt having no spring action, usually rectangular in shape, which is operated by a key or turnknob. It is locked against end pressure when projected.

DEADLOCK: One having a deadbolt only.

DEADLOCKING LATCHBOLT: A spring-actuated latchbolt with a beveled end and incorporating a plunger that, when depressed, automatically locks the projected latchbolt against return by end pressure. See Auxiliary Deadlatch.

DEAD STOP: A positive stop built in the closer prevents the door from going beyond the desired degree of opening.

DEGREE OF OPENING: Maximum opening that a door is allowed to open. Floor closers openings range from 85 - 105 degrees in 5 degree increments.

DELAY ACTION: Delays closing at any point from fully opening, down to 70 degrees to allow for wheelchairs or carts. Note: In order for the delay feature to engage, the door must reach its maximum degree of opening.

DETERMINING DOOR HAND: Stand with your back to the hinge end of the door. Hand of door will be determined by which of your hands the door swings to.

DOGGING: Term used with exit devices. A mechanism that allows the latchbolt to remain in a retracted position thus permitting free push-pull operation of the door from either side. Cannot be used on fire-rated exit devices.

DOH (DOOR OPENING HEIGHT): It is telling you to order the astragal (or other gasketing) in a length equal to the door opening height.

DOOR BUCK:A door frame (usually Metal).

DOOR CLOSER (OR DOOR CHECK): A device attached at the top of the door, either on the surface or mortised, to regulate and control the operation of the door.

DOOR HOLDER: Used for fastening a door in selected open positions.

DOOR PULL: A handle or grip, commonly mounted on a plate, designed for attachment to a door to facilitate opening and closing.

DOOR STOP: A device to limit the opening swing of a door. Also, that part of a doorframe against which the door closes.

DOUBLE ACTING: Double acting doors swing in both directions. Double acting closers are self centering and center hung.

DOUBLE EGRESS: A pair of doors that are comprised of two single-acting doors swinging in opposite directions both doors being of the same hand.

DOUBLE RABBET FRAME: A doorframe having two rabbets.

DOUBLE-ACTING DOOR: A door equipped with hardware that permits it to swing to either side of the plane of its frame.

DOUBLE-ACTING SPRING HINGE: A device for hanging a door, permitting the door to swing in either direction and return to a closed position.

DOUBLE-HUNG WINDOW: A window having top and bottom sashes, each capable of movement up and down in its own grooves.

DOW (DOOR OPENING WIDTH): It is telling you to order the threshold (or other gasketing) in a length equal to the door opening width.

DRAFTSMAN: A man or woman who draws plans using drafting instruments.

DRAWING: The process of pulling metal in solid form through dies to alter its finish, mechanical properties of cross-sectional shape.

DRIP: A molding designed to prevent rainwater from running down the face of a wall, or to protect the bottom of a door or window from leakage.

DRIVERS (OR TOP PINS): The upper set of pins in a pin tumbler cylinder, which when activated by springs, projects into the plug until raised by insertion of the key to the proper shear line for operation.

DROP PLATES: Necessary when narrow top rails or narrow frame face prevent standard closer mounting.

DRY WALL: A wall finished with wallboard in place of plaster; stonewall built without mortar.

DUCT: Sheet-metal conductor for air distribution.

DUCTILE: A term used to describe metals soft enough to be stretched, drawn or hammered without breaking.

DUMMY CYLINDER: One without operating mechanism, for use where effect is desired.

DUMMY TRIM: Trim only, without lock. Usually used on the inactive door of a pair of doors to give balance.

DURANODIC: Trade name used by the Aluminum Co. of America for its hard anodic coatings. See Hard Anodic Coating.

DUTCH DOOR: One having two separate leaves hung one over the other. Usually equipped so that both leaves can be operated as a single unit, or upper leaf can be opened independently.

DUTCH DOOR BOLT: A device for locking together the upper and lower leaves of a Dutch door.

DUTCHMAN: A Dutchman is a wood patch or filler which replaces a damaged or missing area of any wood object. The procedure involves removing a symmetrical, squared area around the defect and replacing it with new wood. It is best to use wood of the same species, grain pattern and color as the original. An ideal Dutchman repair would use a piece of the damaged board for the patch. Since sharp woodworking tools are involved, use extreme caution and care. A Dutchman repair is best made by an experienced woodworker.

EAVES: The lower portion of a roof that extends beyond the wall.

EDGE PLATE: An angle-or channel-shaped guard used to protect the edge of a door.

ELECTRIC STRIKE: An electrical device that replaces a regular lock strike and allows opening of the door from a remote location or by special access equipment.

ELECTROPLATING: The coating of metal by the action of an electric current passing through a chemical compound solution.

ELEMENT: Any number of basic substances (i.e. iron, copper, zinc and nickel) whose characteristics are determined by the structure of their atoms.

ELEVATION: An orthographic projection of the vertical side of a building.

EMBOSSED: Having a raised and/or indented pattern impressed on a surface by means of patterned rolls or stamping dies.

ESCUTCHEON: An elongated plate, either protective or ornamental, contains openings for the cylinder, knob or thumbturn.

ETCH: To produce a textured finish on metal or glass by corrosive action of an acid.

EXCAVATION: A hole formed by removing earth.

EXECUTION: That part of the specification that lays out a description of how the hardware should be handled. Includes marking of cartons, receiving and storage at the job site, installation, final adjustment and cleaning, and additional requirements. Also lists hardware sets as appropriate for the job.

EXIT DEVICE: A door-locking device designed to grant instant exit from an area by pressing on crossbar, which releases the locking bolt or latch.

EXTENDED SPINDLE: Certain floor conditions may require the spindle of the closer to be longer than standard. Spindles may be increased in size by 1/2” increments up to 2” max.

EXTENSION 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.

EXTRUSION: The process of producing metal shapes by forcing heated metal through an orifice in a die by means of a pressure ram; any item made by this process.

FACADE: The front or face of a building.

FACE (OF A LOCK): See Front.

FACING: Any material forming a part of a wall used as a finished surface.

FAST PIN BUTT (HINGE): A hinge in which the pin is fastened permanently in place, preventing separation of the two leaves.

FATIGUE: Structural failure of a material caused by repeated application of stress.

FENESTRATION: The arrangement of windows in wall.

FERROUS: A term applied to materials containing iron.

FERROUS METAL: A metal containing or derived from iron.

FIBERBOARD: Sheet material of refined wood fibers.

FIBERGLASS: A material composed of thin glass threads used for insulation or with resin for a finished surface.

FILIGREE: Fine, decorative openwork.

FINISH HARDWARE: See Architectural Finish Hardware.

FIRE RATED CLOSERS: Closer that is made of approved fire-rated materials.

FIRE STOPPING: Obstructions across air passages in buildings to prevent the spread of hot gases and flames; horizontal blocking between wall studs.

FIRE WALL: A wall extending from foundation through the roof to subdivide a building in order to restrict the spread of fire.

FIREPROOFING: Any material protecting structural members to increase their fire resistance.

FLASHING: The sheet metal work used to prevent leakage over windows and doors, around chimneys, and at the intersection of different wall surfaces and roof planes.

FLAT KEY: A thin, flat, stamped key, usually steel and usually having square-cut baiting on one or both sides.

FLAT KEY LOCKER LOCK: Used to lock metal storage lockers in factories, schools or similar facilities.

FLAT LIP STRIKE: A strike with a flat (non-curved) lip. May often be non-handed.

FLOOR CLEARANCE: The size of the space between the bottom of a door and the finished floor.

FLOOR CLOSER: A door closer that is mounted in the floor. A floor closer not only closes the door but also hangs it. Standard floor closers come complete with top pivot. Side jamb pivots need to be ordered separately.

FLOOR PLAN: An orthographic projection of the floor of a building.

FLUE: A passage in the chimney to convey smoke to the outer air.

FLUSH BOLT: A door bolt so designed that when installed it is flush with the face or edge of the door.

FOOT BOLT: A bolt designed for attachment to the bottom of a door. Usually the bolt is controlled by a trigger, which holds the bolt against a spring. Release of the trigger permits the spring to move the bolt into the locking position.

FOOTING: The bases upon which the foundation and posts rest.

FORGING: Shaping metal by impact of pressure. May be heated prior to shaping.

FORMICA: The trade name for a plastic veneer.

FOUNDATION: The supporting wall of a building below the first floor level.

FRAMING: Lumber used for the structural framing of a building.

FRENCH DOOR: A door with glass panes throughout its length, usually with narrow stiles.

FRICTION HINGE: A hinge designed to swing a door and hold it at any desired position by means of friction control incorporated in the knuckles of the hinge.

FRONT (OF A LOCK): That part of a lock visible in the edge of a door after installation.

FROST LINE: The depth of frost penetration in soil.

FURRING: Wood strips fastened to a wall or ceiling for the purpose of attaching wallboards or ceiling tile.

GABLE: The triangular portion of an end wall formed by a sloping roof.

GALVANIZING: The process of coating metal with zinc, either by dipping in a bath of molten zinc or by electrolytic action.

GASKETING: Certain items and equipment used for the control of environment, weather, sound, vision, smoke, etc.

GATE: A channel in a foundry mold through which the molten metal flows into the cavity made by the pattern.

GAUGE: A number indicating the thickness of materials.

GBK: Glass Bead Kit is for use on doors with raised glass beads and is located between the face of the door and the underside of the hardware such as a rim mounted exit device when you have a full glass kit installed into the door and the trim of the vision frame projects from the face of the door. Typical thicknesses for glass bead kits are 1/4” but others are also available and is manufacturer-specific and the use of glass bead kits is generally limited when it comes to fire rated openings. Also consider the impact of using glass bead kits as it pertains to the length of fasteners that you have as well.

GRAND MASTER KEY (GMK): A key that operates all of a large group of locks, which contain two or more master key groups.

GROUT: Mortar of pouring consistency.

GUTTER: A trough or depression for carrying off water.

GYPSUM BOARD: Board made of plaster with a covering of paper (also called "plasterboard").

HAND: Term used to indicate the direction a door swings.

HANDED HARDWARE: Locks, closers and other hardware, limited to use with doors that swing in a given direction.

HANDICAP CODE: Also referred to as barrier code or accessible code. A term used to describe a standard that is intended for use in making buildings and facilities accessible to the physically challenged.

HARD ANODIC COATING: A coating provided on aluminum by an anodizing process, without the use of dyes or pigments. It provides a high resistance to abrasion and corrosion, and is produced in various shades of bronze and gray, as well as black.

HARDBOARD: Sheet material of compressed fibers.

HARDNESS: The measure of the resistance of a material to indentation, wear of abrasion.

HARDWARE SETS: A group of hardware listed in the specification, under execution, for a specific opening.

HARDWOOD: Wood from trees having broad leaves in contrast to needles. The term does not necessarily refer to the hardness of the wood.

HEADROOM: The vertical clearance in a room or on a stairway.

HEAVY DUTY: Heavy duty floor closers are designed for use on heavy doors or doors subject to heavy use/abuse.

HINGE: Two jointed plates hinged together and attached to a door and its frame. Serves to support or "hang" the door and allows the door to swing or move.

HINGE BACKSET: Distance from back end of hinge to edge of inside door surface.

HINGE JAMB: Vertical member of door frame to which the hinges are applied.

HINGE STILE (OF A DOOR): The door stile to which the hinges are applied.

HINGE TYPES: Classified according to installation method;
    Half-Mortise - Hinge with one leaf mortised in a edge of the door, the other leaf mortised in the edge of the door, the other leaf secured to the surface of doorjamb.
    Full Mortise - Hinge with one leaf mortised in the edge of the door, the door, the other leaf mortised in the doorjamb.
    Half-Surface - Hinge with one leaf mortised in doorjamb, the other leaf secured to surface of door.
    Full Surface - Hinge with one leaf secured to surface of door, the other leaf secured to surface of doorjamb.

HIP ROOF: A roof with four sloping sides.

HOLD OPEN: Optional mechanical feature that is incorporated into the door closer arm assembly. Hold open arms cannot be used on �UL� or fire rated door assemblies.

HORIZONTAL SCHEDULE: A scheduling of "detailed" doors, frames and hardware. Done in a horizontal format, similar to what is found as a door schedule on some architectural plans.

HOSPITAL TIPS: A scheduling of "detailed" doors, frames and hardware. Done in a horizontal format, similar to what is found as a door schedule on some architectural plans.

HOT ROLLED: Shaping a heated form of metal between rollers.

HOT WORKING: The process of forming a metal at extremely high temperature.

HOTEL LOCK: A lock having special locking and access characteristics, especially designed for use in a hotel/motel.

HUB: The part of a lock through which a spindle passes (either knob or turnknob) to actuate the mechanism.

I-BEAM: A steel beam with an I-shaped cross section.

INACTIVE DOOR: That leaf of a pair of doors that is bolted when closed and to which the lock strike is fastened to receive the latch of the active door.

INDICATOR: A device, usually an inward-or outward-moving button, used in connection with hotel locks to indicate whether room is occupied.

INSET: The distance from the face of the door to the face of the jamb.

INSULATION: Material for obstructing passage of sound, heat or cold from one surface to another.

INTERLOCKING JOINT: A joint formed between sheet metal parts by engaging their edges, which have been pre-formed to provide a continuous splice.

JALOUSIE: A type of window consisting of a number of long, thin, hinged panels.

JAMB: The vertical member forming the side of a door, window or wall opening frame. The hinge jamb is the jamb at which the hinges or pivots are installed. The strike jamb is the jamb in which a strike may be installed and away from which the door or window swings. A blank jamb is one that has not been prepared to receive hardware.

JAMB DEPTH: The width of a jamb, measured perpendicular to the door or wall face at the edge of the opening.

KALAMEIN DOOR: A term used to describe doors, frames and trim with a metal covering over a wood core.

KALCOLOR: The trade name used by Kaiser Aluminum and Chemical Corp. for its hard anodic coatings. See Hard Anodic Coating.

KEEPER: Same as Strike.

KEY CHANGE: The baiting of a key to operate the lock for which it is intended.

KEY CHANGE NUMBER: The recorded code or baiting number indicating the key change, usually stamped on key.

KEY SECTION: The cross-sectional shape or configuration applied lengthwise to a key blade that may restrict its insertion into the lock mechanism through the keyway. Each key section is usually assigned a designation or code by the manufacturer. (This is usually shown as a cross-section view from the bow toward the tip of the key).

KEY SET SYMBOLS: The symbols that identify keying instructions from each lock in the schedule.

KEYED ALIKE (KA): A group of locks in which each is operated by the same change key.

KEYING SCHEDULE: A complete listing and explanation of all keys and keying requirements.

KEY-IN-THE-KNOB: A doorknob with built-in cylinder for locking and unlocking with a key.

KEYWAY: The shape or configuration of the hole in the lock mechanism that allows only a key with the proper key section to enter.

KICK PLATE: A protective plate applied on the lower rail of the door to protect against the door being marred.

KNOB: That portion of the lock protruding from the door, it is grasped and turned for entry.

KNOB SHANK: The projecting stem of a knob into which the spindle is fastened.

KNOCKED DOWN: A term used in reference to any product that is shipped disassembled, for assembly at the building site, commonly abbreviated "KD".

KNUCKLE: The enlarged part of a hinge into which the pin is inserted.

LABELED DOOR (OR FRAME): A door or frame that conforms to all the applicable requirements- in respect to fire resistance- of a nationally recognized testing authority and bears a label designating that fire rating.

LALLY COLUMN: A steel column.

LAMINATE: The process of, or a product made by, bonding together two or more layers of material or materials.

LANDING: A stair platform.

LATCH RETRACTOR: In a cylindrical lock, the device that is activated by the spindle, and in turn, retracts the latchbolt.

LATCH UNIT: That portion of a cylindrical lock that fits into the edge of the door housing the latchbolt and latchtail. In a tubular lock, it also contains the retracting mechanism.

LATCHBOLT: A lock component having a beveled end that projects from the lock front but may be forced back into the lock case by end pressure or drawn back by action of the lock mechanism. When the door is closed, the latchbolt projects into a hole provided in the strike, holding the door in a closed position.

LATERAL MOVEMENT: Movement toward the side, sideways.

LATH (METAL): Sheet metal screening used as a base for plastering.

LATH (WOOD): Thin wood used to level a surface in preparation for plastering or composition tiles (also called "furring").

LATTICE: Openwork made by crossed or interlaced strips of material.

LAVATORY: A washbasin or room equipped with a washbasin.

LEAD LINED: L series closers have an arm and top pivot with a special screw pattern to span the lead lining on a door with lead mounted in the middle. If lead is mounted elsewhere in door, consult with us before ordering. Lead lined closers can handle extremely heavy door loads.

LEAF (OF A HINGE OR BUTT): One of the two movable plates which, when fastened together by the hinge pin, form a complete hinge.

LEAF (OF A PAIR OF DOORS): One of the two doors forming a pair or a double door.

LEVER HANDLE: A horizontal handle on a lockset or auxiliary lock.

LIP OF STRIKE: The projecting part on which the latchbolt rides. It may be either a curved-lip or flat lip.

LOCK FRONT: A plate fastened to the edge of a door through which the bolts pass.

LOCK RAIL (OF A DOOR): The horizontal member of a door that receives the locking mechanism.

LOCK STILE (OF A DOOR): The vertical member of a door to which the lock is applied, as distinguished from the hinge stile.

LOCKSET: A complete lock or latch assembly, includes the lock or latch mechanism and trim (knobs, levers, handles, roses and escutcheons).

LOOSE JOINT HINGE: A hinge having only two knuckles, to one of which the pin is fastened permanently, the other containing the pinhole, whereby the two parts of the hinge can easily be separated. These hinges are handed.

LOOSE PIN HINGE: A hinge having a removable pin to permit the two leaves of the hinge to be separated.

LOT LINE: The limit of a lot.

LOUVER: A ventilating window covered by sloping slats to exclude rain.

LUBRICITY: Possessing an inherent lubrication.

LUMBER: Wood that has been sawed, re-sawed, planed, crosscut or matched.

MAGNETIC CATCH: A cupboard catch that uses a magnetized strike to hold the door closed.

MALLEABLE: A term used to describe metals that can be hammered, pounded or pressed into various shapes.

MASONITE: A hardboard trade name.

MASONRY: Material such as stone, brick and block used by a mason.

MASTER KEY (MK): A key with baiting arranged to operate two or more locks of different changes in a group, each lock also being operated by its own individual key.

MASTIC: A waterproof material used to seal cracks.

MEETING STILE: The vertical edge of a door or window, in a pair, which is adjacent to the other door or window. A parallel bevel meeting stile is one, which has a beveled edge paralleling the edge of the other door. A round (radius) stile is one having a rounded edge. A V-bevel meeting stile has edges that bevel in opposite direction, thus forming a "V".

METALLURGY: The science or technology of metals.

MILLWORK: Woodwork that has been finished (milled) in a milling plant.

MITER: A beveled cut.

MODULE: A standardized unit of measurement.

MOLD: A form into which molten metal is poured to produce a casting.

MOLDING: Strips used for ornamentation.

MOP PLATE: A narrow plate, similar to a kick plate, of sufficient height only to protect against the swish of the mop.

MORTAR: A mixture of cement, sand and water used as a bonding agent by masons.

MORTISE: An opening recess or cutout made to receive a lock or other hardware. Also the act of making such an opening.

MORTISE BOLT: A bolt assembly designed to be mortised into a door (in opposition to being surface mounted).

MORTISE CYLINDER: A cylinder with a threaded body and a cam. Normally used with mortise lock.

MORTISE LOCK: A lock assembly designed to be mortised into the edge cut out in a door.

MULLION: A fixed or movable vertical member dividing a door opening.

MULTI-SIZED: Door closers with adjustable spring power, to permit the adjustment of closing power to meet the needs of most doors. They are available with normal power range adjustments or with barrier code and power range adjustments (Sizes 1-4 and 3-6).

MUNTIN: The small members that divide the glass in a window frame.

NICHE: A small recess in the wall.

NOMINAL SIZE: The "name" by which lumber is identified and sold.

NON-FERROUS: Metals that do not contain iron.

NON-HANDED: Door closers which are non-handed permit installation on doors of either hand without modification to the door closer.

NOSING: The rounded edge of a stair tread.

OFFSET HUNG: Offset closers locate the pivot point from the heel edge of the door and from the face of door. 1-1/2� offset closers locate the pivot point from the heel edge of the door and 1-1/2� fromthe face of the door.

OFFSET PIVOT: A special hanging device for heavy-duty doors, used on doors swinging one way only.

OLIVE KNUCKLE HINGE: A hinge with an oval-shaped single knuckle.

ON CENTER: Measurement from the center of one member to the center of another.

OPENING SIZE: The size of a doorframe opening, measured horizontally between jam rabbets and vertically between the head rabbet and the finished floor. The opening size is usually the nominal size and is equal to the actual door size plus clearances.

ORGANIC COATING: A coating such as paint, lacquer, enamel or film in which the principal ingredients are derived from animal or vegetable matter or from some compound of carbon.

OUTLET: An electric socket.

OVERHANG: The horizontal distance that a roof projects beyond a wall.

OVERHEAD CONCEALED CLOSER: A closer in the frame header with an arm connecting to the door at the top rail.

OXIDATION: The natural tendency of compounds to break down and return to their basic, original forms. This characteristic is both beneficial and detrimental in builders' hardware. Rust and corrosion and detrimental, destructive form of oxidation. On the other hand, a finish that darkens with use, i.e., oxidized bronze or copper's "patina" are examples of attractive, essentially non-destructive forms of oxidation.

PADLOCK: A small, portable lock consisting of a case containing a lock mechanism, a shackle or U-shaped bar that fastens into the lock case, and usually a key to open the locking mechanism.

PANEL: A flat wood, metal or glass surface framed in either wood or metal.

PANEL BOARD: The center for controlling electrical circuits.

PANIC HARDWARE: See Exit Device.

PARAPET: The portion of a wall extended above the roof.

PARALLEL RIGID ARM: An exceptionally sturdy arm assembly for parallel arm application only.

PAUMELLE HINGE: A style of hinge using a single, pivot-type knuckle. Generally modern, or streamlined design.

PENNY: A term for the length of a nail, abbreviated "d". Originally, it meant the price per hundred nails (i.e. 8-penny-8 cents per hundred nails).

PENTHOUSE: A housing above the roof for elevation machinery.

PHYSICAL PROPERTIES: Those properties of a material such as specific gravity or density, electrical and thermal conductivity and coefficient of thermal expansion, which serve to characterize and distinguish between different materials.

PIANO HINGE: See Continuous Hinge.

PICKING: The treatment of metal surfaces with a strong oxidizing agent such as nitric acid, to make them chemically clean and provide a strong, inert oxide film.

PICKLING: The treatment of metal surfaces with a strong oxidizing agent such as nitric acid, to make them chemically clean and provide a strong, inert oxide film.

PILASTER: Specifically, an attached pier used to strengthen a wall.

PIN TUMBLERS: Small sliding pins in a lock cylinder working against coil springs and preventing the cylinder plug from rotating until aligned by the baiting of the correct key.

PITCH: A term applied to the amount of a roof slope.

PITTING: Localized surface defects on metals, in the form of small depressions, or "pits."

PIVOT-REINFORCED HINGE: Butt hinge combined and interlocked with a pivot to increase shock load resistance.

PLAIN-BEARING: A standard hinge without ball, oil-impregnated or anti-friction bearings.

PLANK: Lumber 2" or more in thickness.

PLUG (OF A LOCK CYLINDER): The round part containing the keyway and rotated by the key to transit motion to the bolt, or other locking mechanism.

PLUMB: Vertical.

PLY: The number of layers of roofing felt, plywood veneer or other materials.

PLYWOOD: Wood made up of three or more layers of veneer bonded with glue.

POCKET DOOR: A sliding door that slides into the wall making it disappear from sight. Pocket doors are used in both residential and commercial applications and are regarded as upgrades and space savers.

POCKET DOOR FRAME: A pocket doorframe is the hardware and structure needed to support the door, which slides into the wall. The frame also supplies the nailing surfaces for the drywall or other wall material hiding the door.

POCKET DOOR GUIDE: The plastic guides used to keep the [pocket door centered and from rubbing against the sides of the split jamb when the door is operated.

PRE-ASSEMBLED LOCK: A lockset that has all the parts assembled as a unit at the factory. Requires little or no assembly for installation. Installs into a rectangular notch cut into the door edge.

PRE-CASTING: A casting in a mold that is not located at its final position in the structure.

PRIMER: A liquid coating applied to a surface prior to application of one or more coats of paint or other applied finish.

PUNCHING: The process of forcing a punch through metal into a die, forming an opening.

PUSH PLATE: A plate placed on the surface of a door to protect it from wear and soiling, as a result of persons pushing the door open.

QUADRANT (DUTCH DOOR): A device to fasten together the upper and the lower leaves of a Dutch door.

QUENCHING: The process of cooling heated metal by contact with a liquid, gas or solid, for purposes of hardening or tempering.

RABBET: A term used to define that portion of a doorframe into which the door fits. Also 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".

RABBETED LOCK (OR LATCH): A lock whose front conforms to the rabbet on the edge of the door.

RAFTER: A member in a roof framework running from the eaves in the ridge. There are hip rafters, jack rafters and valley rafters.

RAIL: A full-thickness, horizontal structural member forming the top or bottom edge of a door or sash. May be located at an intermediate height in a door, separating panels or glazed area.

REBAR: Reinforcing bar.

RECAPPING: A total count and grouping by category, of all hardware.

REINFORCED CONCRETE: Concrete containing more than 0.2 percent of reinforcing steel.

REMOVABLE CORE CYLINDER: A cylinder containing an easily removable core assembly, which incorporates the entire lumber mechanism including the plug, tumblers and separate shell. The cores normally are removable and interchangeable by use of a special key (called a "control key").

REMOVABLE MULLION: A mullion separating doors vertically within a doorframe. Required for the normal operation of doors by designed to permit its temporary removal so the entire width of the opening can be utilized.

RETURN: A molding turned back to the wall on which it is located.

REVEAL: The distance measured from the surface of the frame face to the surface of the door.

REVERSE BEVEL: A term used to designate the hand of a door when the door swings to the outside/key swing.

RIB: A raised ridge or fold formed in sheet metal to provide stiffness.

RIM: A term indicating articles of hardware designed for application to the surface of the door or frame.

RIM CYLINDER: Mounted through the door independently of the lock, usually by screws from the reverse side, and engaging the lock mechanism by means of tailpiece.

RISER: The vertical board of a step. It forms the front of the stair step.

SADDLE: See Threshold.

SASH: A framing for windowpanes. A sash window is generally understood to be a double-hung, vertically sliding window.

SATIN FINISH: Builders' hardware that has been scoured with an abrasive to achieve a dull luster.

SCHEDULE: A list of parts or components (such as a hardware schedule).

SCHEDULING SEQUENCE: A proper and orderly listing of various hardware items for each door.

SCOURING: The application of a fine abrasive to achieve a satin, or dull, finish. The abrasive may be applied by hand, wheel or belt.

SCREWLESS KNOB: A knob attached to a spindle by fastenings other than screws.

SEALED CLOSER: Closer sealed in cement case preventing debris from getting in between the closer body and cement case.

SECTION: An orthographic projection that has been cut apart to show interior features.

SHANK (OF A KNOB): The projecting stem of a knob into which the spindle is fastened.

SHEAR LINE: The interface between the plug and shell in a cylinder that is normally obstructed by the pin tumblers. The pins must be raised to the sear line by the correct key to allow the plug/key to turn.

SHEATHING: The rough boarding on the outside of a wall or roof over which is laid the finished siding or the shingles.

SHERARDIZED: A thin anti-corrosive coating of zinc to cover steel.

SHIM: A piece of material used to true up or fill in the space between the two surfaces.

SHUTTER HINGE: A hinge designed to swing shutters.

SIDELIGHT: The outside layer of boards on a frame wall.

SIDING: The outside layer of boards on a frame wall.

SILENCER: A small piece of resilient material attached to the stop on a doorframe to cushion the closing of the door.

SILL: The stone or wood member across the bottom of a door or window opening. Also the bottom member on which a building frame rests (sill plate).

SINGLE ACTING: Doors that swing in one direction. All offset hung closers are single acting. Center hung closers maybe single acting as well.

SINGLE-RABBET FRAME: A doorframe having only one rabbet.

SINTERING: The solidification and fusing of compressed powdered metal.

SLEEVE: A tubular portion of the lock through which spindles extend and which provides a bearing surface for the knobs. On heavy-duty locks the sleeve provides the threaded member to which the roses are attached.

SLIDE TRACK: For installations where an aesthetic appearance is desirable. There is no arm or bracket projecting from the face of the door.

SLIDING DOOR PULL: A pull that is either flush with the edge of the door or with the face of a sliding door.

SOFFIT: The under surface of the stop at the frame head. That portion of a doorframe between the rabbets on a double-rabbeted frame or between the rabbet and the outer edge of the frame on the stop side of a single-rabbeted frame. Sometimes referred to as the "stop width."

SPACKLE: To cover wallboard joints with plaster.

SPAN: The distance between structural supports (i.e., the length of a joist, rafter or other member).

SPECIFICATIONS: A written document that accompanies the working drawings, which sets forth standards for, the materials used in the construction of buildings. It also covers all conditions relating to that construction; labor, bidding, purchasing, payment, etc.

SPINDLE (OF A KNOB): The bar connecting the knobs or levers and passing through the hub of the lock for the purpose of transmitting the knob/lever action to the latchbolt.

SPINNING: A process for shaping sheet metal. During the process a tool is pressed against the metal as it revolves.

SPLIT ASTRAGAL: An astragal that is split through the middle, allowing each door leaf to operate independently.

SPRAYING: The process of coating materials with paint or clear lacquer by use of air pressure.

SPRING HINGE: A hinge containing one or more springs to move the door into a closed position. It may be either singe-or double acting.

SPRING POWER ADJUSTMENT: On sized closers, power can be increased by 50% over the minimum closing force for each closer size.

STILE: The vertical members of a door to which the lock and hinges are applied.

STOOL: The wood shelf across the bottom and inside of a window. Also a water closet.

STOP (OF A LOCK): The buttons or other manual device to lock or unlock the outside knob or thumbpiece. A similar device in an auxiliary lock to keep the latchbolt retracted.

STORY (STOREY): The space between two floors, or between a floor and the ceiling above.

STRAP HINGE: A surface hinge of which both leaves are of considerable length.

STRIKE: A metal plate or box that is pierced or recessed to receive the bolt or latch of a loc. Sometimes called a "keeper."

STUD: The vertical member that forms the framework of a partition or wall.

SUB-FLOOR: The rough flooring under the finish floor.

SURFACE BOLT: A rod or bolt mounted on the face of the inactive door of a pair to lock it to the frame and/or sill; operated manually.

SURFACE HINGE: One having both leaves secured to the surface of the door and frame.

SWAGING: A slight offset of the hinge leaves at the barrel, which permits the leaves to come closer together. All hinges for full mortise application are swaged. Normal swaging on standard and heavy gauge hinges provides a clearance of 1/16� when leaves are parallel. Full mortise wide throw hinges have a clearance of 3/32�. Hinges for full surface application are not swaged. Blank hinges are for full surface welded application and are always furnished �flat back� unless other wise specified. When only one leaf is swaged, the non-swaged leaf is approximately 1/16� shorter. Exception-on template hinges for metal door and metal frame application both leaves must be the same width, so specify: �Leaves must be equal.� These hinges also require right or left hand specification. When only one leaf is swaged, the non-swaged leaf is approximately 3/32� shorter. Exception-on template hinges for metal door and metal frame application both leaves must be the same width, so specify: �Leaves must be equal.� These hinges are handed requiring right or left specification.

SWEEP SPEED: Standard hydraulic feature that permits adjustment of the doors� closing speed from the fully open position down to approximately 10 degrees from the closed position. Also referred to as closing speed.

SWING: The direction of opening of a swinging door Synonymous with the "hand of a door."

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 work, which the other end is free to operate.

TAILPIECE:�The connecting link attached to the end of a rim cylinder, which transmits the rotary motion of the key through the door, into the locking mechanism.

TAKEOFF:�The listing of openings and the appropriate hardware from a set of floor plans and door schedule.

TEE:�A structural steel member in the shape of a "T".

TEMPERATURE RISE DOOR:�Doorthat has a rating determined by the amount of heat passing through the doorforthe first 30 minutes of a fire test.

TEMPERING:�The process of heating metal, glass or other material to a temperature below the transformation stage, then cooling it at a controlled rate to change its hardness, strength, toughness or other property.

TEMPLATE HARDWARE:�Any item of hardware that is made to template, i.e., exactly matching the master template drawing as to spacing of all holes and dimensions.

TEMPLATE HARDWARE:�Hardware manufactured within template tolerances.

TEMPLATE:�A precise detailed layout or pattern for providing the necessary preparation of a door orframe to receive hardware.

TENSILE STRENGTH:�Resistance to a force tending to tear the material apart.

TERMINATED STOP (Cut-Off Stop) (Hospital Stop): A stop which terminates above floorline and is closed with a 45 or 90 degree angle.

TERRACE:�A raised flat space outdoors.

TERRAZZO: Floor covering of marble chips and cement ground to a smooth finish. Metal strips are used to separate different colors and create designs.

THERMAL STRESS:�Stress within a material caused by temperature variations.

T-HINGE:�A surface hinge with the short member attached to the jamb and the long member attached to the door.

THRESHOLD:�A raised member extending between the jambs of a frame atthe floor.

THROAT FILLER:�Flat section generally with offset edges, used to close frame section throat. Usually fastened in by tackwelding to backbends.

THROAT OPENING:�Opening between backbends of frame.

THROW:�The distance that a deadbolt or latchbolt projects when in the locked position.

THRU-BOLTS (SEX NUT & BOLTS): Bolts commonly used to secure door closer to �UL� rated wood fire doors.

TOP RAIL: Horizontal rail at the top of door connecting lock stile with the hinge stile.

TRANSLUCENT:�Having the ability to transmit light but not a clear image.

TRANSOM BAR:�That part of a transom frame which separates the door area portion from the transom area portion.

TRANSOM FRAME:�Doorframe having transom bar and glass, panel orlouver above door opening.

TRANSOM: A small window over a door.

TRANSPARENT:�Having the ability to transmit clear images.

TREAD:�The horizontal part of a step.

TRIM PROFILE:�The non hardware portion of an adjustable or splitframe.

TRIM:�A decorative member applied to the face of the doorjambs. Often used to cover or hide the joint between a doorframe and the adjacent wall surface. Also, decorative as well as functional components of a lockset, i.e., knob, rose or escutcheon. Also, decorative and/or functional components applied to a door to assist in its operation, i.e., push plates, pull plates, pulls, and kickplates.

TRIM:�See Face.

TRIMMED OPENING:�See Cased Opening.�

TRI-PACK: A term used to describe the packaging of most closers for installation, regular arm, top jamb and parallel arm mountings.

TRUSS: A braced framework capable of spanning greater distances than the individual components.

TUBULAR LOCKSET:�A lockset made up of three components: outside knob, rose and spindle assembly; latch unit with retracting mechanism; and inside knob and rose assembly.

TURNKNOB:�A small knob usually crescent or oval shaped, with spindle attached, for operating the deadbolt of a mortise lock.

UNDERCUT: Clearance between door bottom and finished floor.

UNIT LOCK: See Pre-Assembled Lock.

UNIVERSAL: A term used to describe a lock, door closer or other device that can be used on doors of either hand, without modification or change.

UTILITY LOCK: Also called "cam locks." Used for a variety of locking purposes. They are identified by the flat metal piece extending from the lock barrel, which is the cam.

VAPOR BARRIER: A thin sheet used to prevent the passage of water vapor.

VENEER: A facing material not load-bearing

VERTICAL SCHEDULE: A scheduling of "detailed" hardware for like openings.

VESTIBULE: A small lobby or entrance room.

VISION LITE: Small vision window in upper portion of a door, usually square but often rectangular in a vertical position.

WAINSCOT: An ornamental covering of walls often consisting of wood panels usually running only part way up the wall.

WALL: An exterior wall (a partition is an interior wall).

WALL TIE: A metal piece connecting widths of masonry to each other or to other materials.

WARDED KEY: One having cuts (grooves and/or notches) designed to clear corresponding wards or projections in the lock case or keyhole.

WATERPROOF: Material or construction that prevents the passage of water.

WEATHERSEAL CHANNEL: A top closing channel on a door, setin mastic with flanges downward.

WEATHER-STRIP: Narrow strips made of metal, or other material, designed so that when installed at doors or windows it will retard the passage of air, moisture or dust around the door or window sash.

WEEPHOLE: An opening at the bottom of a wall to allow the drainage of moisture.

WIDE SIDE (OF DOOR): See Hinge Side.

WIND BRACING: Bracing designed to resist horizontal and inclined forces.

WOOD STUD ANCHOR (CLIP): Metal piece attached to inside throat of frame which secures frame to wood stud.

WORKING DRAWING: A drawing containing information for the workers.

WRAP-AROUND FRAME: A frame which fits overthe wall.

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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

A: Ampheresor Amps

A.H.C.: Architectural Hardware Consultant

Ack: Acknowledge

AE: Authorized Entry

AH: Allen Head(screws);usually followed by

AL: Aluminum; also Alum

AMS: All machine screws

AN: Anodized

ASA: American Standards Association

AU: Auxiliary

AWG: American wire gauge

AWS: All wood screws

B.H.M.A.: Builders Hardware Manufacturers Association

BB: Ball bearing

Bev: Beveled (as in lock front, door edge or stile)

BPS: Bolt position switch

BS: Backset(of a lock)

BTB: Back to back; also B to B

C: Center of centerline

C: Common

CCTV: Closed circuit television

CF: Customer furnished

CFC: Cut for cylinder; also used �C for cylinder; C/C and cut/cyl

CFT: Cut for turn knob; also used -C/th, CFTT, c for t.k.

CH: Channel

CI: Channel iron (door frame)

CLS: Closed loop secure

Corr: Corridor

CS: Concealed switch(hinge)

CTC: Countersunk

Cyl: Cylinder(of a lock)

DA: Double acting

DB: Decibel

Dbl.: Double; also used Dble

Deg: Degree

Dia: Diameter

DP: Dust proof

DP: Display panel

DPDT: Double pole double throw

DPS: Door position switch

DPS: Dust proof strike

Dr: Door

DT: Dummy trim

Ea: Each

EOL: End-of-line resistor

Eq: Encl Equipment Enclosure

ES: Expansion shield

Ext: Exterior

FBT: Flat button tip (hinge)

FD: Fire door

FH: Flat head(screw)

Fl: Floor

Fr: (of a door or sash); commonly used with

FS: Fail-safe operation

Ga: Gauge

Gal: Gallon

GN: Grommet nut

GND: Ground

HC: Hollow core

Hdg: Heading

HM: Hollow metal

Hr.: Hour(¾hr.,1½hr.,3hr-fire door ratings)

HT: Hospital tip(hinge or pivot)

Hz.: Hertz

ID: Inside diameter

Int.: Interior

Int.: Intermittent duty

J: Jamb

J: Jack

Ka: Keyed alike

Kal.: Kalamein; also K

KD: Keyed different

KVA: Thousand volt amp

L: Lip (of a strike)

L.E.D.: Light emitting diode

L/C: Less cylinder

LBR: Less bottom rod (of a vertical rod type exit device)

LH: Left hand

LHRB: Left hand reverse bevel

LL: Lead lining (of a door)

Lox.: Locks

LP: Light-proof (door)

LS: Lead shield

LT: Lamp test

M: Meter

M.A.: Milliamps

Maint.: Maintained

Max.: Maximum

MC: Metal clad

Min.: Minimum

Mom.: Momentary

MS: Machinescrews

MxM: Metal by metal; denotes metal door in metal frame

NS: Narrow stile

O.H.: Overhead (door)

O.L.S.: Open loop secure

OB: Oilite bearings (as in hinge)

OBS: Open back strike

OD: Outside diameter

OH: Oval head (screw)

OS: Outside

OSKP: Outside knob pinned

OST: Outside trim; also OS/T

P: Plug

P.C.: Printed circuit

P.L.: Power lock

P.O.A.: Price on application

P.S.: Power supply

P.U.L.: Power unlock

PBS: Protected box strike; also used PBX

PH: Phillips head (screw)

Pr.: Pair

PSI: Pounds per square inch

RA: Remote alarm

Rab.: Rabbeted

Rad.: Radius

RB: Reverse bevel

RC: Rounded corners

Reg.: Regular

Rem.Mul.: Removable Mullion(for use with exit device)

RF: Radius front; denotes lock or flushbolt with

RH: Round head(screw)

RH: Right hand

RHRB: Right hand reverse bevel

Rm.: Room

RR: Remote alarm

RR: Remote reset

Rtn.: Return

S.P.D.T.: Single pole double throw

Sgl.: Single

SH: Security safety stud

SH: Spanner head (screw)

SMS: Sheet metal screws

SNB: Sex nuts and bolt; also SBN

Spdle.: Spindle(for a knob)

SS: Stainless steel

Std.: Standard

STMS: Strike to template machine screw

STS: Self-tapping screw

TB: Terminal block

TB: Through bolts

TBGN: Through bolt sand grommet nuts

TBN: Through bolts and nuts

TC: Tin clad

TD: Time delay

TMS or tms: To Template with machine screws

UC: Under cut (door)

UC: Under cut head (screws); also used US and UCH

UL: Under writers Laboratories

US: United States; commonly used as prefix to

VA: Volt amps

VAC: Volts alternating current

VDC: Volts direct current

VOM: Volt-ohmmeter

Wd: Wood

WD x MF: Wood door x metal frame

WD x WF: Wood door x wood frame

WS: Wood screws

x: By (i.e. HMD x HMF)

X-bar: Crossbar (of an exit device)

Yds.: Yards

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