... :M3-M64, 1/8''-3'' 3.Grade:6,8,10,12.9 Square nut1.standard:DIN(din557,din562), BS, ANSI/ASME ... .finish: zp(bluish, white, yellow), plain4.class:4.8,6.0,8.8,12.9 grade:2,5,85.finish: zp(bluish ... , Q235,Q195) Middle carbon steel(10B21,35#, 45#)7.processes: cold forging and hot forged