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5/8"-11 x 1-1/2", Hex flange head, US, Zinc plated grade 5

US Fasteners, 5/8"-11 x 1-1/2", Hex flange head, Zinc plated grade 5

Flange bolts

Flange bolts

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