high precision hex nut 1.iron edge's parallelism:0.002 2.out diameter tolerance:+/-0.001 3.length tolerance:+/-0.001 High precision hex Nut1 ... , E-coating, Silkscreen, Heat treatment, Black oxid; 4.Production equipment : precision and automatic lathe made in TaiwanCNC lathe5.Standard/ specification: OEM ... establishing business relation with you for long term, thank you ! high precision hex nut