... . many kinds of material and finish can be selected Grade 5 Black Hex nut 1). Size:M3-M64; 1/8"- 2 ... /2"2). Grade:53). Material:stainless steel, carbon steel4). Treatment:Plain, hot dip galvanizing, Phosphated, Zinc, Nickel, Dacromet, black oxide5). Standards ... nuts, hex flange nuts, wing nuts, weld nuts, square nuts, cap nuts.Washers: flat washers, spring washers, lock washers, structural Washers ...