... :8.8,10.9,12.9 4Material:Q235,45#,4Cr Rail fastener high strength structural steel nut bolt I. Item:High ... 7999, DIN 931, ISO 7412, ISO 4775, ISO 7416, JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T ... products 4.Factory view figurespackagingfactory viewTesting equipmentsWorkshop Welcome your visit! Rail fastener high strength structural steel nut bolt