Specification Item Nylon insert lock nut Main products DIN982 Size M5-M56 Measurement Metric, Imperial (Inch) Material Carbon Steel:Q195, 1035, 1045,10b21 Grade 4, 6, 8, 10, 12 Heat Treatment Tempering,Spheroidizing,Quenching,Spheroidizing annealing etc. Hardness Mild Carbon Steel: HRC:25-60,HV450-700 Standard GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc Non-standard OEM is available, according to drawing or samples