... material precision machining strict inspection.2. Specifications We make gear wheel , shaft, gearbox . We make High Precision gear, gear wheel , shaft, ... and Tempering, High Frequency Quenching, Carburizing Quenching and so on. 6. Surface Treatment: Galvanizing/Zincplating, Dacrotized, Black ... Burnishing, Sand-blasting and so on according to ROHS demand. 7. Inspection: All items are checked and tested ...