... specialling in spur gear producing 2, material : brass , stainless steel POM 3, OEM and small quality accepted 4 ... SGS Standard: ISO, GB, JIS, DIN, AGMA and non-standard Material: Carbon steel, stainless steel, plastic ... and tempering, Nitriding, high frequency treatment, black of oxidation, zincing, nickelage. Machine: CNC engine lathe, milling machine, drilling machine, hobbing machine, grinder, gear ...