Back Home / Fasteners / Bolts / HEX FLANGE BOLT SERRATED UNC ZINC 5/16″-18 X 1″ GR 8 HEX FLANGE BOLT SERRATED UNC ZINC 5/16″-18 X 1″ GR 8 SKU: X5618X1HF8Z Categories: Bolts, Fasteners An unslotted hex head screw with unified thread pitch and a flange that has serrations on the bearing surface side. For use in applications where loosening forces are present, such as vibration. Diameter 5/16″ Case Quantity: 100 Log In For Pricing