SAE grade 8 Hex flange bolt Middle carbon steel zinc plated Heat treated ... to 6 inch ( for thread 3/4)Grade 5, 8 or customized featuresMaterial could be CS or SS304.Surface coating ... standard metric sizes availableOr customized specificationsMetric size M6 to M16Grade 8.8, 10.9 and 12.9Surface Treatment Optional: Black oxide, ... could be CS, SS302, SS304, SS316Grade A2 or A4 SAE grade 8 hex flange bolt