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Grade 5 steel, 1/2"-13 x 2-1/2", Hex flange head, US

US Fasteners, Grade 5 steel, 1/2"-13 x 2-1/2", 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.