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coach screw[′kōch ‚skrü]
A large, square-headed, wooden screw used to join heavy timbers. Also known as lag bolt; lag screw.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
lag bolt, coach screw, lag screw
A bolt having a square head and a thin, coarse-pitched thread.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.