... industrial ceramic parts include, tube, rod, plate, disc, wafer, ring, seal, bearing, valves, pump plunger, beam, roller, shaft, screw, washer, ... precision toleranced ceramic components or assemblies are used in a wide range of semiconductor, electronic, electrical, mechanical, chemical, automotive ... .01Planeness0.005Roughness 0.05Fit clearance0.005 ceramic ring& 99% alumina ceramic part