Which operates most key-operated locks?

Which operates most key-operated locks?

• A. Levers
• B. Pins
• C. Cylinders
• D. Gears

Answer: (C)

The part that translates a key’s cuts into turning action in most key-operated locks is the cylinder. Inside the cylinder are pin stacks, and the key’s cuts lift these pins to precise heights so the gap between the bottom and top pins lines up at the shear line. When this alignment happens, the cylinder (the plug) can rotate, retracting the bolt and opening the lock. This cylinder-based mechanism is what makes the vast majority of everyday locks key-operated. Levers describe a different, less common mechanism where the action is on a set of levers rather than a rotating cylinder, and gears aren’t typically used for the opening action in standard key-operated locks. Pins are part of the internals inside the cylinder, not the overall actuator by themselves.

The part that translates a key’s cuts into turning action in most key-operated locks is the cylinder. Inside the cylinder are pin stacks, and the key’s cuts lift these pins to precise heights so the gap between the bottom and top pins lines up at the shear line. When this alignment happens, the cylinder (the plug) can rotate, retracting the bolt and opening the lock. This cylinder-based mechanism is what makes the vast majority of everyday locks key-operated. Levers describe a different, less common mechanism where the action is on a set of levers rather than a rotating cylinder, and gears aren’t typically used for the opening action in standard key-operated locks. Pins are part of the internals inside the cylinder, not the overall actuator by themselves.