Carriage bolt is generally used for wooden operations and also known as plow bolts. They have a dome top but a square head under it. The square head on mainly a circular shank makes it self-locking. This lets the bolt to be locked with a single tool such as a spanner or wrench.

Carriage bolts were developed for use through iron strengthening plates on either side of a wooden beam. It is commonplace though to use them into bare timber, the squared section giving enough grip to prevent rotation.

All sizes and dimensions are available. Different threads such as ISO Metric, BSW, BA, BSF, UNC, UNF UNEF etc are used.

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