... and TC11 are R and Y,TC6 is M.2)Different specifications will be according to clients' demandsStandardASTM B348,ASTM F136 ... strictly controlled,ensuring our clients get the best products. 2)Tolerance Diameter/mmTolerance/mmForged or extrusionHot rolledPolished,cold rolled, ... 0.5+/-0.4>25~40+/-2.2+1.2-0.5+/-0.5>40~60+/-2.5+1.5-1.0+/-0 ... -1.0+/-0.8>90~120+/-3.5+2.2-1.2+/-1.2>120~160+/-5.0+/-1.8>160~200+/- ...