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Zinc plated steel, Hex flange head, 5/8"-11 x 1-3/4"

US Fasteners, Zinc plated steel, Hex flange head, 5/8"-11 x 1-3/4"

Flange bolts

Flange bolts

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