... Competetive price Precision steel spur gear Our Advantages:1) Gear precision: ISO Class 4~5 ( Niless gear grinding )2) heat treatment: ... Carburization and the hardness cuold be reached HRC58-623) Gear Mould no.: 0.3~154) Teeth profile: Spur,Helical ... ,Worm,Spiral or other types 5) Use application: gear box for steelworks Product TypeCNC hobbing gearMaterial:42CrMo, 20CrMnMo, 20Cr2Ni4 ...