... 8 Hex flange bolt Middle carbon steel zinc plated Heat treated, YZP, HDG, BZP options Diameter Size from 1 ... Specifications Supply:Thead size: 1/4, 3/8, 5/8 up to 3/4Length: 1/2 to 6 inch ( for thread 3 ... /4)Grade 5, 8 or ... metric sizes availableOr customized specificationsMetric size M6 to M16Grade 8.8, 10.9 and 12.9Surface Treatment Optional: Black ...