DinStock Manufacturers of Industrial Fasteners

Mushroom Head Square Neck Bolts (Cup Square)

Product Code DIN603
Coach Bolt, Carriage Bolt...


A Mushroom Head Square Neck Bolt, also known as a Coach Bolt, Cup Square or Carriage Bolt, has a square shoulder under a rounded head which resists turning when the nut is tightened or removed. Carriage bolts are 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. Used whenever a smooth finish surface is needed so that nothing becomes snagged on the fastener. Zinc plating, retards the corrosion rate in a normal atmosphere.

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