S45C 20CrMnTi 40Cr 42CrMo Perfect rotor 1.We specializes in rotor ,spur gear, helical gear,slewing ring ... Max OD can be up to 2m. 3.Quality:finest material and process.Hardened and durable,good ... and detection equipment includes: Gear measurment machines(MM) magnetic particle flaw detector, common normal micrometer micrometer inside ... .Wormly welcome to visit our factory. High quality Rotor , gear