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bat bolt[′bat ‚bōlt]
A bolt whose butt or tang is bashed or jagged.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A bolt barbed or jagged at the butt, or tang, to give it a firmer hold.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.