International Standard DIN, ANSI, GB, JIS, Bsw, GOST Class/Grade 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 Used Machinery, Chemical Industry, Environmental Surface Finishing Hot Galvanized, Black, Color-Zinc, Blue-White Zin Name Screw Nut ...