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5/16"-18 x 5/8", Hex flange head, Zinc plated grade 5 steel

US Fasteners, 5/16"-18 x 5/8", Hex flange head, 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.