S45C 20CrMnTi 40Cr 42CrMo High Performance transmission parts 1.We specializes in rotor ,spur gear, helical gear,slewing ring gear, bevel gear,motor gear, sprocket,forging gear, casting gear, etc.(verious of gears as per your requirement) . 2.Our precision grade can be 5-7 grade, MOD can be up to 0.4-18mm.Max OD can be up to 2m. 3.Quality:finest material and process.Hardened and durable,good ...