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How Far To Turn

The companion question to which way to turn a lock is how far to turn it. Desk and filing cabinet locks generally open with less than a quarter turn (90 degrees) of the plug. When opening a desk lock try to avoid having the plug lock in the open position. Locks built into doorknobs also tend to open with less than a quarter turn. Locks which are separate from the doorknob tend to require a half turn to open. Deadbolt lock mechanisms can require almost a full turn to open.
Turning a lock more than 180 degrees is difficult because the drivers enter the bottom of the keyway.

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