Grade 5 Carriage Bolts, Zinc
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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. Grade 5 is the most common grade used in manufacturing assembly. Zinc plating, retards the corrosion rate in a normal atmosphere.