Hex head high strength bolts for steel structure Apply to standard: A325, A490,GB1228,GB1231,DIN931,DIN933,ect Hex head high strength bolts for steel structure1.Materials: Low carbon alloy steel2.Property grade: 8.8 or 10.9s3.Mainly used in steel structure4.Size: M16-M30, length:40-200mm5.Apply to standard: A325, A490,GB1228,GB1231,DIN931,DIN933,ect. High Strength Hex Bolt for Steel Structure