Back Home / Fasteners / Nuts / HEX FLANGE NUT NON SERRATED PLAIN 5/16″-18 GR 8 HEX FLANGE NUT NON SERRATED PLAIN 5/16″-18 GR 8 SKU: X8FN5618 Categories: Fasteners, Nuts A flange nut has a wide flange at one end that acts as an integrated washer. The flange serves to distribute the pressure of the nut over the part being secured. Less likely to loosen as a result of an uneven fastening surface. Non-serrated. Meet SAE J995. Normally used in conjunction with grade 8 frame/flange bolts. Size: 5/16″-18. Case Quantity: 100 Log In For Pricing