shaft 1.Lenths:20mm~800mm, Straightness:0.01mm 2.Diameter:2mm-50mm, Roundness: 0.005mm. 3.Material, steel, ss steel etc Shaft1. material ... :carbon steel:C35,C45,40Cr etcalloy steel:42CrMo,35CrMo,9cr2V, 42CrMo4,70Mn and ... Elongation (L=5D) = 16% Min. Applied range:Forging shaft/forged shaft used in wind power generation high-speed gear case,high ...