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Zinc plated grade 8, 5/16"-18 x 1-3/4", Hex flange head, US

US Fasteners, Zinc plated grade 8, 5/16"-18 x 1-3/4", Hex flange head

Flange bolts

Flange bolts

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