Hex Nut, Nut,DIN934 Hex Nut M3-M42 Zinc,Plain,Black,HDG Carbon Steel,Class6,8,10,2H ISO9001: ... or requirementsSize:M3-M42Class or Grade:class/grade 4,5,6,8,10,12Head Mark:S6, S/8/, S8, S10,S12 ... . Alloy Steel: 40CRFinishing: 1. Plain2.White Zinc Plated : CR3+ , CR+63.Yellow zinc plated 4. Black zinc plated5. Black6.Heat treatment7.H.D ...