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5/16-18 x 7" Carriage Bolts A307 Grade 2 Zinc Plated "Coach Screws" 5/16"-18

5/16-18 x 7" Carriage Bolts A307 Grade 2 Zinc Plated "Coach Screws" 5/16"-18

A carriage bolt, coach bolt or round head square neckbolt is used through iron strengthening plates on either side of a wooden beam.It is commonplace though to use them on bare timber, the squared section givingenough grip to prevent rotation.