... ,DIN934 Hex Nut M3-M42 Zinc,Plain,Black,HDG Carbon Steel,Class6,8,10,2H ISO9001:2000 Hex Nuts, Nuts,Hexagon NutsCertificate ... :M3-M42Class or Grade:class/grade 4,5,6,8,10,12Head Mark:S6, S/8/, S8, S10,S12,S 2H ... "T 4" "T8" etc.Material: 1. Low Carbon Steel: C1008/C1010/C10152. Middel Carbon Steel: C1030/1035/1040/10453. Alloy Steel: 40CRFinishing ...