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.