... thin section ball bearings have been manufactured from aluminum, 300 series stainless steel, 17-4PH and other metals. Some special ball ... materials include CRES 440C, 300 series stainless steel, silicon nitride, and M50 steel.Freerun Bearing supplies ... Metric Flanged Series from 10.00—50.00mmIf you do not find any item in this list,please contact us. High Performance thin ...