Shafts with thread, shafts with gear, shafts with worm in the field of OEM 1.Material: Low/Medium Carbon Steel, Stainless Steel according ... , NF, JIS, BS, AISI ).2.Diameter of shafts: <=30 mm3.Straightness: 0.003mm/100mm4.Surface Roughness: Ra 0.001mm5.Salt spray test, heat treatment ...