pin tumbler

Noun
  1. Cylindrical tumblers consisting of two parts that are held in place by springs;
    When they are aligned with a key the bolt can be thrown (synset 103947289)
    is a type of: tumbler - a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown
    is a part of: cylinder lock - a lock in which a cylinder rotates to move a bolt; tumblers are pins; inserting the key lifts and aligns the pins to free the cylinder to rotate
    same as: pin

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