单词	coach screw
释义	coach screw coach screw n (Building) a large screw with a square head used in timber work in buildings, etc coach screw coach screw [′kōch ‚skrü] (design engineering) A large, square-headed, wooden screw used to join heavy timbers. Also known as lag bolt; lag screw. lag bolt, coach screw, lag screw lag bolt A bolt having a square head and a thin, coarse-pitched thread. ThesaurusSeelag bolt
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