Size: 1/2" - 4" Grade: O, A,DH,etc. Material: 45#, 40Cr, 42CrMo(B7), etc. Finish: Plain, Black, Zinc, H.D.G., etc. Specification: ASTM A 563 -Carbon and Alloy Steel NutsDimensions: ANSI B 18.2.2Size: 1/2" - 4"Grade: O, A,DH,etc.Material: 45#, 40Cr, 42CrMo(B7), etc.Finish: Plain, Black, Zinc, H.D.G., etc. Heavy hex nuts and heavy hex jam nuts-A563