A keyway (or keyhole) is the shaped channel in a lock cylinder into which the key slides to gain access to the lock tumblers. Lock keyway shapes vary widely with lock manufacturer, and many manufacturers have a number of unique profiles requiring a specifically milled key blank to engage the lock's tumblers.
Most people refer to lock keyways as keyholes, a linguistic carryover from the days when locks utilized big keys that actually entered the lock through a hole in the door.
- "glossary k". Locksoft.com. Retrieved 2011-12-02.
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