square bolt

square bolt

A door bolt which moves in a casing; similar to a barrel bolt but has a square rather than a circular cross section.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
In the Model 500 the lifter is skeletonized and lies invisibly on both sides of the square bolt when the action is closed.
All we had was a socket wrench with a 24-inch handle and an end wrench that fit square bolt heads.
What you see in both the centerfire and rimfire versions is a square bolt, reciprocating back-and-forth in a trough formed by the sheet metal receiver.
In response to the letter about square bolts and nuts, Fastenal Co.