... StandardISO, GB, JIS, DIN, AGMA and non-standardSurface TreatmentCarburizing, hardening and tempering, Nitriding, high frequency treatment, black ... polishing , plating , acid treatment , anodizing , painting and PVC powder coatingEquipmentSprial bevel gear milling machine, hobbing machine, grinding ... by our well-trained and proffesional engineer and staffs.4. Special discount and protection of sales ...