| Part | Function | |------|-----------| | (not visible in simple diagram) | 5-6 spring-loaded pins of varying lengths. When correct key lifts pins to the shear line, the plug can rotate. | | Cam | A rotating arm attached to the plug. As the key turns, the cam pushes or pulls the latch retractor. | | Retractor | A sliding metal piece that pulls back the latchbolt. | | Latchbolt | The spring-loaded angled bolt that engages the strike plate on the frame. | | Deadlatch (optional) | A small secondary plunger that prevents forcing the latchbolt back when door is closed. |
The diagram of a cylinder door lock illustrates a simple but precise mechanical system: the key aligns internal pins, rotates a cam, retracts a latchbolt, and allows the door to open. Each component—from the keyway to the strike plate—plays a critical role in security and function. This diagram serves as a foundational reference for lock professionals, DIY installers, and security students. diagram of a door lock
The process is reversed. The key is turned to misalign the pins with the shear line, and the bolt (latch) moves to lock or unlock the door. | Part | Function | |------|-----------| | (not
Understanding this diagram helps you troubleshoot common issues: As the key turns, the cam pushes or