Square nut 1.Standard:DIN, BS, ANSI/ASME, ISO and non standard 2.Size:M3-M64, 1/8''-3'' 3.Grade:6, ... 8,10,12.9 Square nut1.standard:DIN(din557,din562), BS, ANSI/ASME, ISO, GB, nonstandard ... /8''-3''3.finish: zp(bluish, white, yellow), plain4.class:4.8,6.0,8.8,12.9 grade:2,5 ...