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You can use the information contained here to find helpful definitions of commonly
used terms to aid with the selection process.
 Backset
The measurement between the
edge of the door to the center of
the hole drilled for the lock.
 Bolt
The piece of metal that protrudes
and secures or closes a door.
 Cylinder
The round assembly of the lock
which provides the ability to lock a
door through the tumbler and the
keyway.
 Deadbolt
A lock whose latchbolt is engaged
by using a key or a thumbturn.
 Fixed Interior
A term used to describe a stationary
piece of door hardware that does
not provide any latching function
for the door.
Finish
The color of the metal of the door
hardware.
Function
The type of door hardware used by
a specific entry or door.
Example “Bed/Bath”, “Hall/Closet”
or “Entry”.
 Locking
Both knobs locked or unlocked by
outside key or thumbturn inside.
 Non-Locking
Both knobs always free.
Handing
Some styles of levers are handed,
usually due to a curved lever design. There
are left-handed levers and righthanded
levers. To determine the
appropriate handing for your door,
look at the hinges from the exterior
side of the door. As you stand outside
facing the door, if the hinges are on
the left, you require a left-handed
lever. If the hinges are on the right,
you need a right-handed lever.
 Handleset
The door hardware that encompasses
a grip or handle along with a
deadbolt function to lock the door.
 Keyway
The area on the face of a keyed
product where the key is placed.
 Knobset
A door set consisting of inside and
outside knobs.
 Latch
The mechanism that throws the bolt
or closes the door when the door is
closed.
 Leverset
A door set consisting of inside and
outside levers.
 Rose
The circular plate surrounding the
knob or lever that is flush against the
door.
 Strike
The metal attachment that is
mounted onto the doorframe.
 Thumbturn/T-turn
The small knob or lever turnpiece on
the inside or inner trim that operates
the deadbolt function.
 Throw
The measurement of the projection
of a deadbolt latch.
 Thumb Piece
The small moving part on the grip of
a handle that is depressed when
opening a handleset.
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