... 2.Grade : 8.8 s, 10.9s 3.Surface: black, yellow zinc, HDG,ect. Sets of high strength hex head bolt for steel ... : black, yellow zinc, white blue zinc, H.D.G. ,5) Grade of strength: 10.9s6) Materials: SWRCH8A, SWRCH35K, Q195LY, 20MnTiB ,45#, 40CrMo ... 45#,35#12-30(mm)HRC35-45 HDG Property grade Tensile strength sbYield strength sbElongation sbReduction rate pImpact value ak (Mpa)(Mpa)%%(J ...