... ,8.8,10.9,12.9 3:Material:mild steel,45# steel,40Cr,42CrMo high strength hex bolt, hex cap bolt, balck bolt1. Surface ... .9, 12.93. Material: mild steel, 45# steel, 40Cr, 42CrMo4. Packing: standard neutral carton box fastened with palltet5. Quality certificate:6. Supply ability ... quality control(3) very reasonable and competitive price China fastener high strength hex bolt