1)nut and bolt 2>Grade: Q235,202,304,316L 3>Finish: Zinc ... .5-3.0mm 5>Size:41*41mm,41*25mm NIut and bolt:Specifications:Material:35# 45# steel.40Cr.35Crmo. Finish:Black ... ,BS,DIN), eye bolt (DIN444) and so on. NUT:(M12-45), include spring nut, hex nut(DIN934), cap nut(DIN1587), hex flange nuts(DIN6923), hex ...