Active:In paired or double doors, the hinged door leaf which is primarily operable.
Astragal:A wood or steel 'post' attached on the latch-side edge of one of a set of paired or double doors, which covers the space between doors when they are closed. Which acts like a stop for the active door.
Ball-Bearing Hinge:A heavier-duty hinge than the standard hinge, with bearings supporting the pivots. Ball-bearing hinges are usually used for heavy doors that will be in commercial or industrial use.
Ball Catch:A spring loaded ball mechanism that is inserted into the top edge of doors that have dummy locks. The ball engages a plate on the header that has a dimple to receive the ball, which in turn keeps the door closed.
Casing:A horizontal or vertical molding, which accents or trims edges of doors and windows to the surrounding walls.
Clad:Provided with a facing or jacket which works as a protection against weather, and provides a finished appearance. Cladding may be painted metal, plastic, or a heavy coating applied by the manufacturer. Provided with a facing or jacket which works as a protection against weather, and provides a finished appearance. Cladding may be painted metal, plastic, or a heavy coating applied by the manufacturer.
Clear Jambs：Natural wood door frames, without paint or primer applied, and which appears to be made of full-length pieces of stock, without joints or knots.
Closer Block：An inside reinforcement, usually placed across the top edge of a door, to enable firm fastening of self-closing hardware to the door.
Core：The center section of a door.
Cylinder Lock：Lock hardware that mounts into a door which has been prepared with a bored hole or holes through the face, and into the edge.
Deadbolt：A latch used to secure a door closed, the latch being driven from the door into a receiver in the jamb or frame.
Deadbolt Spacing：The distance between the cylinder lock to the bore for the deadbolt lock.
Door Hand：The door hand is the description of which side of the door the lock-set is on and consequently, which side of the door has the hinge pins visible.
Double-Glazed：Outfitted with two panes of glass with a sealed airspace between.
Drywall Opening：A rectangular opening in a wall, usually an interior wall, prepared to the size @necessary to receive a pre-hung door assembly.
Dummy Cylinder：A lock without a latch, typically used for the passive door panel of a double door unit, so that the hardware appears equal to that used on the active panel.
Electric Strike:A mechanism, which allows a switch to open the latch of a door.
Faceplate Mortise:The pocket in the edge of the door that is mortised to receive the faceplate.
Finger Joint:A way of joining short sections of board stock together, end to end to make longer stock. Door and frame parts are often made using finger-jointed pine stock.
Fire Door:A door of a construction type, which has been tested to contain the spread of fire from one room or occupancy area to another. Fire doors are listed and labeled to show their ratings in terms of time, i.e.,112 hour, 1-112 hour, etc.
Flush-Glazed:A type of glazed door which has its glass perimeter moldings flush with or set down from the face of the surrounding door.
Frame:In door assemblies, the perimeter members at the top and sides, to which the door is hinged and latched. See jamb.
Glazing:The elastic material used to seal glass to a surrounding frame.
Grille:For doors with glass lites or inserts, a removable face-mounted assembly of thin wood or plastic pieces, which when in place, gives the lite or insert a patterned multi-pane look.
Grooved Glass :Glass, which has been decorated with abrasively routed recesses. Grooving can give a single piece of glass a multi-paned look.
Handing: A term, which describes or determines the direction of swing of a door when opening.
Head, Head Jamb: The horizontal top frame member of a door assembly.
Header Clearance :The clearance between the top edge of the door and the head jamb.
Hinge An assembly of metal plates and a cylindrical metal pin, which when fastened to a door edge and to a doorframe, allow the door to swing or rotate in its frame.
Hinge Pattern The dimensions that locate the hinges on the door edge.
Hinge Sizes The distance across the hinge, measured parallel to the hinge pin.
Hinge Stile The full-length vertical pane of a door, at the side or edge of the door, which fastens to its frame with hinges.
Inactive A term for a door panel fixed in its frame. Inactive door panels are not hinged and are not operable.
Inswing A term used to describe an exterior entry door unit for which, when the hinged door panel is opened, the panel swings into the building.
Jamb A vertical perimeter frame pad of a door unit.
Knuckle The feature of a hinge where the hinge leaf is cut for two or three projections which wrap and form a barrel or socket for the hinge pin.
Laminate A thin sheet of wood or plastic that is bonded with adhesive to a core or substrate which creates a decorative and usable surface.
Latch A moveable, usually spring-loaded pin or bolt, which is part of a lock mechanism, and engages a socket or clip on a door jamb, retaining the door closed.
Latch Bore The hole drilled into the edge of a door to accept the door latch portion of the lock hardware.
Leaf A term which can apply to a door or hinge and which defines a part of the assembly which can swing on a pivot. Butt hinges have two leaves.
Lite An assembly of glass and a surrounding frame, which is assembled to a door, or is integrally built into the door at the factory
Lock Block A rectangular block of wood or other solid material, placed inside a door assembly at the lock side edge, which reinforces the assembly when the lock hardware is installed.
Lock Bore For cylindrical lock-sets, the large through hole, usually 2-1/8-inches in diameter, bored near the door panel's lock edge into which the lock mechanism is placed and installed.
Lock Height The dimension from the top of the door to the center line of the lock bore.
Lock Stile In insulated door assemblies, the full-length part, usually wood, which makes up the lock edge of the door panel. In wood stile and rail doors, the full length wood piece, 4 to 6-inches wide, at the lock edge of the door.
Mortise A recess cut into the surface or edge of a part, usually for the purpose of housing hardware such as hinges, latch plates etc.
Mortise-Type Lock A lock-set which usually has a rectangular-shaped mechanism, which is housed into a deep recess cut into the edge of a door.
Mullion A post or divider which runs from sill to frame top in a multi-panel door, or door and sidelite assembly. In stile and rail doors, the vertical wood parts which separate panels,
NRP Hinge An abbreviation for a hinge with a non-removable pivot pin. NRP hinges are used when exterior doors swing out, as a security feature. The fixed pins make it impossible to remove a door by driving out pivot pins.
Outswing An exterior door assembly in which the door panel swings outside the building.
Panic-Proof Lock A lock and latch device, which permits a door to be, opened outward by pressure being applied to a horizontal bar mounted across the inside face of the door.
Passage Lock A lock-set, which will retain a door, closed, but which cannot be locked.
PVC Abbreviation for polyvinyl chloride, a plastic material used to make molded or extruded parts.
Rabbet, Rebate A groove or step cut along the length of the edge of a piece of wood that is to be joined to another with a corresponding tongue or ledge cut into it.
Strike A metal part with a hole or recess for receiving a door latch. It has a curved or ramped face so that a spring-loaded latch contacts it when closing. Strikes are fit into mortises in doorjambs or mullions, and screw-fastened.
Tempered Glass A glass sheet, which has been strengthened by heat processing.
Threshold Another term for sill. The horizontal part of a door assembly, fixed under the door panel and bearing on the floor.
Triple-Glazed An insulated glass assembly made of three thicknesses of glass, with air spaces between the outer and inner thicknesses.
Veneer A thin film or facing, adhesively bonded to a core or substrate, which makes up the exposed and decorative face of an assembly.
Wired Glass Glass made for use in fire doors, which has embedded wires which bind the glass, and permit the glass to remain solid when exposed to fire.