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(pronounced BOHLT)

In the A&D world, this word has several meanings: 1) A roll of cloth with a specified length. 2) A rod or bar used to fasten a door. 3) The portion of a lock that is inserted into the door from the mechanism located in the doorjamb in order to secure it. 4) A metal rod having a screw thread and a head at one end used to fastening objects together during construction.