Hex Nut, Nut,DIN934 Hex Nut M3-M42 Zinc,Plain,Black,HDG Carbon Steel,Class6,8,10,2H ISO9001:2000 Hex Nuts, Nuts ... "T 4" "T8" etc.Material: 1. Low Carbon Steel: C1008/C1010/C10152. Middel Carbon Steel: C1030/1035/1040/10453. Alloy Steel: 40CRFinishing ... : 1. Plain2.White Zinc Plated : CR3+ , CR+63.Yellow zinc plated 4. Black ...