... Ring Assemblies,Robotics,Harmonic Drives all major OEMs.Freerun Bearing thin section ball bearings are offered in radial contact, angular contact, 4 ... , 17-4PH and other metals. Some special ball materials include CRES 440C, 300 series stainless steel, silicon nitride, and M50 steel.Freerun Bearing ... in this list,please contact us. High Performance thin section ball bearing