tower bolt[′tau̇·ər ‚bōlt]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
barrel bolt, tower bolt
A door bolt which moves in a cylindrical casing; not driven by a key.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.