1)nut and bolt 2>Grade: Q235,202,304,316L 3>Finish: Zinc Plated 4>Thickness: 1.5-3.0mm 5>Size:41*41mm,41*25mm NIut and bolt:Specifications:Material:35# 45# steel.40Cr.35Crmo. Finish:Black or zinc plated or HDG Standard:DIN931/933/912/601 Grade:4.8/8.8/10.9 Features: 1) Standard: DIN, GB, JIS, ANSI, Non-standard 2) Material: Carbon steel, stainless steel ,aolly steel3) Coating: plain, zinc, nickel ...