... ,galvanized.. 2.Grade:4.8,8.8,10.9,12.9 3:Material:mild steel,45# steel,40Cr,42CrMo high strength hex ... bolt, hex cap bolt, balck bolt1. Surface:black oxide, phosphated,galvanized, Dacrotized2. Grade:4.8, 8 ... (2) Strict quality control(3) very reasonable and competitive price China fastener high strength hex bolt