A cylinder (or shell, housing) is a lock component which holds the plug, actuator, and locking components. Though most commonly associated with pin-tumbler based lock designs, cylinders are used in many others, such as wafer and disc-detainer.
A threaded cylinder that screws into a door assembly and is held in place by set screws on each side.
A cylinder that is held in place by screws that extend through the cylinder itself.
Key in Knob (KIK)
A cylinder that is inserted into a knob or housing, held in place by various methods depending on the housing's design.
A cylinder of a standard european format that is held in place by a screw that extends through the center of the cylinder.
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