gear shaft 1.Lenths:20mm~800mm, Straightness:0.01mm 2.Diameter: ... , Roundness: 0.005mm. 3.Material, steel, ss steel et Gear ShaftSpecificationsproduct name:gear shaft Hardness:from 58 degree to 62 degree Harden ... μmremark:we can offer some special requirments such as threading,reducing shaft diameter,coaxial holes drilled and tapped gear shaft,worm gear shaft