A carriage bolt, coach bolt or round head square neck bolt is a form of bolt used to fasten metal to wood. A carriage bolt has a square shoulder under a rounded head which resists turning when the nut is tightened or removed. So they are good for wood-to-wood connections when the head may not be accessible for tightening. The carriage bolt can not only used for wood applications, but also some specialized versions can also be utilized to fasten metal components. Also dubbed coach bolts or plow bolts, the fastener has a design similar to a standard bolt.
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