... kinds of gears (spur gear, bevel gear, sprial gear, ring gear, internal gear, sprocket, chain wheel) transmission, gear box, reducer ,shaft and ... black of oxidation, zincing.EquipmentSprial bevel gear milling machine, hobbing machine, grinding machine, gear shaving machine, CNC lathes, precision ... for high precision on teeth of gear.Minimum quantityAccept trial order steel pinion differential gear