... .8, 5.8, 6.8, GR.2, A3072) Material :Alloy steel :20MnTiB ,40Cr ,42CrMo Class :8.8, 10.9,12.9 ... ,A325-1,A490-1 ,GR.B7,GR.B7M3) Material :stainless steel :302 ,304 ,305 ,316, 304L ,316L ,410, 430 Class: A2 ... phosphorus ,Brass , Nickel plate ,Chrome plate ,Heating galvanization ,Zinc plated(yellow, black, green)Packing: 1) Bulk packing: about 20-25kgs per ...