Door Hardware Glossary. Types of Keyways. Door Functions.

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  Richelieu Decorative Hardware
  Richelieu Decorative Hardware


Both inside and outside always unlocked. No option to lock. Common Uses: Hall & Closet.

Inside locks with turn or push button. Can be opened from the outside with a small emergency pen. Common Uses: Bedroom & Bathroom.

Entrance Lock
Inside locks with turn button. Outside requires a key to lock & unlock. Common Uses: Exterior Door, Workshop & Garage.

Storeroom/Vestibule Lock
Outside is fixed. Entrance by key only. Inside is always unlocked. Inside is always free for immediate egress. Common Uses: Janitorial Closet & Storage Shed.

Classroom Lock
Outside is locked and unlocked by key. Inside is always unlocked. Inside is always free for immediate egress. Common Uses: School Classroom.

Dummy (half/full)
Dummy trim is non-functioning. Used for door pull or as matching inactive trim. Half dummy is for one side of the door. Full dummy is for both sides. Common Uses: Non-Active French Door & Foyer Door.

Single Cylinder Deadbolt
Inside locks/unlocks with a thumb-turn. Outside locks/unlocks with a key. Common Uses: Entrance Door without Glass.

Double Cylinder Deadbolt*
Inside locks/unlocks with a key. Outside locks/unlocks with a key. Common Uses: Entrance Door with Glass. *Check local fire codes.
ANTI-PICK PINS: Top pins which create a false sheer line to add security against pick attacks.
ACTIVE DOOR: The door in a pair of doors into which the locking system is installed. Normally the only door in the pair which is used for entry or egress.
BACKSET: A term used to describe the distance from the edge of a door to the center of the cross bore hole.
BOTTOM PIN: Cylindrically shaped tumbler, which may be conical, ball shaped, or chisel pointed on the end, which makes contact with the key.
CTC (Center to Center): A term used to describe the measurement from center to center between 2 holes.
CYLINDER: A complete operating unit consisting of the plug, shell, tumblers, springs and actuating device into which the key is inserted to operate a lock.
CYLINDER COLLAR: A plate or ring installed under or behind a cylinder to enhance appearance and/or security.
DBLC: Baldwin term indicating double cylinder function.
DEADBOLT: A lock with a bolt extending into the door jamb which is rigid.
DOOR HAND: A term to describe the direction a door swings. Example: Right Hand (RH), Left Hand (LH), Right Hand Reverse (RHR), or Left Hand Reverse (LHR).
DOOR KNOB: Round or oval shaped knob which turns a latching mechanism on a door.
DOOR LEVER: Lever shaped door handle which turns a latching mechanism on a door.
DOOR THICKNESS: The measured thickness of a door. Required to determine certain components of door hardware.
DOUBLE CYLINDER (DBLC): 1 lock which requires the use of a key from both interior and exterior.
DUMMY: A door knob or lever which is stationary and does not turn any latch mechanism.
DUMMY DOOR: The inactive door in a pair of doors.
EMERGENCY EGRESS: Term used to describe a lock function that allows simultaneous retraction of both deadbolt and latchbolt by operating the interior door knob or lever.
ENTR: Baldwin term which indicates a keyed single cylinder function.
ENTRANCE (ENTR): A term which indicates a keyed single cylinder function.
ESCUTCHEON: A surface mounted trim plate which enhances the appearance and/or security of a lock installation.
FD: Baldwin term indicating full dummy function (back to back – interior/exterior).
FLUSH BOLT: A mechanism installed in the edge of a dummy door which locks the door into the opening so the active door can lock into the dummy door. Normally installed in pairs at the top & bottom of the door.
FULL DUMMY: A pair of knobs/levers mounted back to back on a door, or a matching lock trim installed on the dummy door on a pair of doors not operating any mechanism.
GRAND MASTER KEY: The key which operates 2 or more separate groups of locks, which are each operated by a different master key. A grand master key system has exactly 3 levels of keying.
HANDLESET: Term describing a lock trim with a handle and thumbpiece on the exterior of the door, and a knob/lever on the interior.
KEY BLANK: A key manufactured to the proper size and configuration allowing its entry into the keyway of a specific locking device, but has not yet been cut, or bitted, to any code.
KEY CODE: Keys and locks cut to a specific code.
KEYED ALIKE (KA): Term describing multiple locks which are operated with the same key.
KEYED DIFFERENT (KD): Term describing groups of locks with a key code that is different from the others.
KEYWAY: Term to describe the correct key required to fit a particular manufacturer’s cylinder. EX: Schlage C-Keyway, Kwikset KW1 Keyway, Weiser WR3 Keyway, etc.
LATCHBOLT: The mechanism that extends from the edge of a door into the jamb, beveled to the hand of the door, and usually operated by the door knob/lever, or thumbpiece of a handleset. Normally spring activated.
LHRH: Baldwin term which indicates both left and right hand levers are included with product in single cylinder lockset.
LRDB: Baldwin term which indicates both left and right hand levers are included with product in double cylinder lockset.
LRFD: Baldwin term which indicates both left and right hand levers are included with product in dummy lockset.
MASTER KEY: A key which operates all the master keyed locks or cylinders in a group.
MASTER KEY SYSTEM: A keying arrangement which has 2 or more levels of keying.
MINUS ROSE (MR): Term describing a door knob/lever without any rosettes (rose).
MORTISE LOCK: A lock which is mortised into the edge of a door which combines the two functions normally required on a door; latching and bolting (deadbolt).
PASSAGE: Term to describe a latching function only.
PATIO: Term to describe a lock which locks the exterior side of a door but has no keyed access from the exterior.
PIN TUMBLER: The tumbler used in a lock cylinder. Three types are normally used: Bottom Pin, Top Pin and Master Pin.
PLUG: The part of a cylinder which contains the keyway, with tumbler chambers usually corresponding to those in the cylinder shell.
PLUG FOLLOWER: A tool used to allow removal of the cylinder plug while retaining the top pins, springs, or other components within the shell.
PRE-DRILLED HOLE: Term describing a door which has been bored for a standard hardware prep; usually a 1” edge bore, 2-1/8” side bore @ 2-3/8” or 2-3/4” backset.
PRIVACY: Term to describe a locking function mainly for a bedroom or bathroom. Not intended for security use.
RE-KEY: To change the existing combination (code) of a cylinder or lock.
ROSE OR ROSETTE: A circular plate attached to the door under the knob/lever.
SECTIONAL LOCK TRIM: A lock trim consisting of a pair of knobs/levers, with roses, a cylinder and cylinder collar, and a thumb turn. No escutcheon plate.
SINGLE CYLINDER: A lock requiring the use of a key from one side of the door, usually the exterior side.
SINGLE DUMMY: A knob/lever surface mounted on the interior or exterior of a door which does not turn any mechanism.
SPINDLE: Square shaft component that connects the knob or lever and operates the latching mechanism.
STOP BUTTONS: Mechanism on a mortise lock that allows the exterior trim to be locked, while the interior remains unlocked.
STRIKE PLATE: The component of a lock or latch that is installed on the door jamb, into which the latchbolt or the deadbolt extends. Usually made from brass and matches the finish on the hardware.
SWIVEL SPINDLE: Spindle with a swivel joint in the middle allowing the exterior and interior knob/lever to turn independently of each other.
THUMB TURN: Lock trim component which typically is used to lock a deadbolt from the interior side of a door.
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