CYLINDERSare the portion of a lock where the key is inserted to lock or unlock the set. There are several different kinds common to entry sets:

Mortise Cylinders
Mechanisms that are threaded into mortise locks secured by a set screw through the edge of the lock and vary in length for different door thicknesses.

ADDITIONAL TERMINOLOGY:

Active Door
The primary door in a pair of doors and typically has an operable handle set.

Butt Hinges
Hinges with one leaf mortised to the jamb and one leaf mortised to the edge of the door.

Cabinet Roses
The back plates behind the cabinet knob or pull.

Clavos
Decorative nails typically applied to the surface of the door.

Edge Pulls
Used to retrieve a pocket door from the pocket.

Emergency Release
This term refers to the capability of a lock to be unlocked from the exterior side in case of an emergency situation. This is an aspect of most interior privacy lock sets.

Flush Pulls
Recessed pulls used on sliding doors such as pocket or bypass doors.

Handing
Indicates where the door is hinged and the direction it swings. Please see chart below.

Inactive Door
The secondary door in a pair of doors. The inactive door is often secured with flush or surface bolts and typically has inoperable handles.

Ornamental Hinge Strap
A decorative piece of metal applied to the surface of the door to mimic a strap hinge.

Strap Hinges
Hinges that have one leaf applied to the surface of the jamb and one leaf attached to the surface of the door.

Spring Assist
Each handle has an additional spring attached to the handle and the escutcheon that returns the lever, knob or ring to the neutral position; this mechanism eliminates sagging handle.

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