... :+/-0.0001mm ECO-material stainless steel piston pin bushing with screw thread Specifications:1) Suitable for various automotive, electronic, ... carbonadoing, others optional can be as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV ... Aluminum, and so on, with an output of over 1 million pieces per month. stainless steel piston pin bushing with screw ...