... corrosion Eco-friendly ISO9001:2008 & 2000; tolerance: +/-0.0001 precision steels spindle Specifications:1) Suitable for various automotive, electronic, telecommunications, mechanical ... can be as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, others optional7) Products ... output of over 1 million pieces per month. precision steels spindle