bottom bolt

bottom bolt
a bolt at the bottom of a door or the like, sliding into a socket in the floor or sill and equipped with a device for keeping it raised when the door is not fastened.

Useful english dictionary. 2012.

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  • extension bolt — noun : a bolt set flush and vertically (as at the top or bottom of a door) having a long extended rod by which it may be conveniently slid into place * * * a bolt fitted into a mortise in a door or the like, sliding into a socket in the head or… …   Useful english dictionary

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