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Zinc plated grade 5 steel, Hex flange head, 5/16"-18 x 1-1/2", US

US Fasteners, Zinc plated grade 5 steel, Hex flange head, 5/16"-18 x 1-1/2"

Flange bolts

Flange bolts

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