Coach Bolt (Cup Sq Hex)

Coach Bolt (Cup Sq Hex) from Thomas Potter Ltd

A Coach Bolt, also referred to as Cup Square Hex or Carriage Bolt, has a square shoulder under a rounded head which resists turning when the nut is tightened or removed.

The bolt is pushed into a hole the same size as the shank and then hammered in the rest of the way, where the square shoulder locks it firmly in place.

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