| Latch Bolt | A beveled spring bolt, usually operated when either the knob or lever is turned, or when the thumbpiece which operates the handleset is pushed down. |
| Leaf (of a pair of doors) | One of the two doors forming a pair of doors. |
| Left Hand Door | If hinges are on the left side of the door when viewing from the outside, door is left handed. |
| Letterbox Back Plate | A plate, similar to a letterbox plate, attached to the inside of a door to allow the passage of mail. |
| Letterbox Plate | A plate attached to the door with an opening to permit insertion of mail. |
| 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. |
| Lip of a Strike | The projecting part on which the latch bolt rides. |
| Lock Rail (of the door) | The horizontal member of a door intended to receive the lock case. |
| Lock Set | 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 but 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. |
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Hardware Terms M | |
| Magnetic Catch | A cupboard catch that uses a magnet to hold the door closed. |
| Master Key | Operates any quantity of cylinders of different individual key changes. |
| Masterkeying | An arrangement of cylinders having individual key changes, which permits them all to be operated by a simple key called a master key |
| 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. |
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Hardware Terms N | |
| Panic Exit Device | See Exit Device |
| 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. |
| Passage Function (Hall/Closet) | Knob or lever set most commonly used in hallways where a locking feature is not required. |
| Paumelle | A style of hinge embodying a single joint of the pivot type, generally of modern, or streamlined design. |
| 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 parts assembled as a unit at the factory and which, when installed in a rectangular notch cut into the door edge, requires little or no disassembly. |
| Prison Lock | A heavy lock designed especially for use on jail cells. |
| Privacy Function (Bed/Bath) | Knob or lever set most commonly used in bathroom or bedroom; can be locked from the inside with a push button emergency release feature. |
| Push Plate | A plate applied to the lock stile to protect the door against soiling and wear. |
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