... :2008 & 2000; minimum tolerance: +/-0.0001 bronze gear and wormsSpecifications:1) Suitable for various automotive, electronic, ... Quality control equipments: roundness meter, projector meter, microscope, gear-test meter, surface measuring meter and so on4) ... as requirements6)Material: iron/aluminum, copper, alloy, carbon steel, 18CrMnTi,20CrMnTi,20Cr,20CrV,1045 steel, others optional7 ...