American Quality Products - Cylinders & Parts

Bitting:	The manner in which the cylinder pins are organized in sequence and in relationship to the cut of the key. See Fig. 4.
Cam:	The part of the cylinder that activates the locking or unlocking of the lock. See Fig. 8
Cylinder Rings:	A decorative and functional ring in which the cylinder is seated.
Control Key	The key that retracts the core from a removable core cylinder.
Follower:	A tool which is used to keep the pins in the cylinder shell or housing, once the plug is removed.
Hi-Security:	A special cutting of the key, in which the records of the bitting and keyway sections are protected by the lock manufacturer, making duplication of the key very difficult.
Key Bow:	The large end of the key.
Keyed Alike:	Two or more cylinders or locks that operate with the same key.
Master Key:	A single key which operates a group of cylinders that are keyed different.
Mortise Cylinder:	A threaded cylinder that operates a mortise lock.
Pins:	A part of the cylinder that corresponds to the cut of the key. See Fig. 4.
Plug:	The center portion of a cylinder which is rotated by the key. See Fig. 1.
Removable Core Cylinder:	Cylinder in which the core can be extracted quickly with the use of a control key without removing the lock from the door.
Rim Cylinder:	A type of cylinder that is used with exit devices or auxiliary locks. A tailpiece from the back of the cylinder operates the lock.
Restricted Key Section:	A rare keyway which is hard to purchase and makes duplication of a key difficult.
Shell:	The part of the cylinder which holds the cylinder plug or core. See Fig. 3.