Active Door: [In a pair of doors] The leaf that opens first and has the lock/latch.
Armored front, or Scalp: A lock front for mortise locks consisting of a heavier inner faceplate which is permanently riveted or is screwed to the lock case. It is covered by a finish outer plate machine screwed to the inner faceplate. For cylinder locks, it consists either of two separate plates with the inner one made a permanent part of the lock body and a finish plate secured with wood or machine screws. The two plate may also be permanently joined by hollow rivets that allow mounting by finish screws.
Astragal: A molding applied to the meeting edge of a pair of doors to protect against weather.
Backplate: An escutcheon larger than a rosette, used as a means of mounting a handle.
Backset: The distance from the edge of the door to the center of the hole drilled for the knob, lever, thumbturn or keyed cylinder. A 2-3/8" or 2" backset is standard for residential doors. Backsets of 1" to 5", even 24" are available.
Bar Latch: Simple latch mechanism mounted on the surface of a gate, cabinet door, shutter, or small closet door. Operated by raising a hinged lever attached to the door. Usually includes a flat strike plate, lever, and guide.
Bore: Bore is the diameter of the hole drilled in the face of a door stile to receive the spindle for the handles; for the body of particular cylindrical latch mechanisms or for the body of a keyed cylinder, deadbolt or thumbturn.
Cam: A piece of metal applied to the back of the cylinder plug to activate the lock. Mortise locks require specific cams to operate.
Cane Bolt: A type of door anchor that pushes a long metal bolt through two surface-applied brackets and into a socket. Usually used to keep gates in the closed position.
Carriage Bolt: A bolt with a smooth, round head used in wood. Since the head is rounded, a small square section under the head keeps the bolt from spinning while the nut is tightened on the other side.
Casement Stay or Adjustor: A pivoting rod for moving and securing the hinged sash of a casement or French window. It is mounted to the sash bottom rail and window sill for out-swinging sash, or to the interior casing for in-swinging sash.
Casement Fastener: The handle that open and secures a casement window. Typical design is of a handle with projecting tongue that engages the strike.
Casement Window: A type of window that opens like a door on butt hinges, or on scissor hinges that allow the window to pivot within the opening. Typical mechanisms to open and close the window are either a manual crank, a casement fastener or a handle for a multipoint lock. European style casement windows may also have a Tilt & Turn function, which requires a lever-operated mechanism. The handle swings up to open the window a few inches at the top of the frame; or it will swing down to open the window like a traditional casement window.
Casement Fastener Strikes:
Mortise Strike - a flat strike that is set flush in the face of the jamb or stop.
Surface Strike - a strike has a wedge-shaped face that secures the tongue of the casement fastener. It is mounted on the face of the inactive leaf of a double casement window with the fastener mounted on the active leaf. The inactive leaf should be secured with an edge or surface bolt at top and/or at bottom.
Rim Strike- A flat strike with a hook for in-swinging single casement windows.
Center-to-Center: Measurement from the center of one item to the center of another. Used when determining spacing between latches and deadbolts, etc.
Change Key: A key which will operate only one lock in a series, as distinguished from a master key which will operate all locks in a series.
Clavos: Wrought-head nails used to decorate doors; it is the Spanish word for nails.
Cremone Bolt: A reciprocating surface-mounted decorative bolt mechanism most often used on French doors and windows. Traditionally, an oval knob or lever engages a gearbox that drives surface bolts upwards and downwards into strikes at both the top jamb of the opening and the sill, threshold or floor.
Closet Spindle: A spindle with a knob or lever on one end and a thumbturn on the other end; generally used for closet doors.
Crossbore: The hole that is drilled through the face of the door that receives the spindle or handle hub of a knob or lever . Door knobs and levers must fit the crossbore on pre-drilled doors and conceal the hole.
Cylinder Lock or Latch: Any lock or latch mechanism contained in a cylinder. Most commonly used on entry doors where a key cylinder allows lock operation on the exterior and thumbturn is used on the interior. A double cylinder is used in instances where key operation is needed on both sides.