... ,UNI5587 hex nuts,2.nut size:M3~~M563.nut material:low carbon steel,carbon steel 35#,stainless steel,brass4.nut grade: 4.8/8 ... /105.nut finish: Black, Plain,Zinc Cr+3,Yellow Zinc ... ' special requirements, in grades 4.8, 6.8, 8.8, 10.9, 12.9, A2-50, A2-70, and A4-70 ...