Control shear line
Control shear line: the secondary shear line of certain interchangeable cores which controls the sleeve and its locking lug and thereby the removal of the core from its cylinder. The control shear line is the gap between the sleeve and the cylinder housing. A special key, called the control key, lifts the pins so that the control pins line up at the control shear line and permit the sleeve to turn and the locking lug to retract. See also operating shear line.
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