gear shaft 1.Lenths:20mm~800mm, Straightness:0.01mm 2.Diameter:2mm-50mm, Roundness: 0.005mm. 3.Material, steel, ss steel et Gear ShaftSpecificationsproduct name:gear shaft Hardness:from 58 degree to 62 degree Harden part:0.8~0.3mm Diameter:6~60mm Product Name: shaftModel: TCS6Material: #45Chardness:HRC60±2precision:g6rough:less than 1.5μm(Rmax)harden part:0.8~0.3mmDiameter:6~50mmlength:1000mm~ ...