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Hex flange head, 1/2" x 2-1/2", Zinc plated grade 5 steel

US Fasteners, Hex flange head, 1/2" x 2-1/2", Zinc plated grade 5 steel

Flange bolts

Flange bolts

Flange bolts have a flange on the bottom of the head that distributes the load like a washer.