1)Non-standard metal componets of steel nuts. 2)ISO9001, ISO14001, ISO13485. 3)Pass Torque Test per customer requirement. 1. OEM non-standard steel ... ) Surface treatment: Black; Zinc, Nickel, powder coating, sand blasting etc.4) Certification: ISO16949, ISO9001, ISO14001, ISO13485.5). Standard : AISI, ASTM, JIS, BS, DIN ...