... , tube, rod, plate, disc, wafer, ring, seal, bearing, valves, pump plunger, beam, roller, shaft, screw, washer, sleeve, hunger, spacer, holder, ... , chuck, nozzle, guide, frame, lining, and grinding media, milling ball or beads.These precision toleranced ceramic components or assemblies are ... 0.005Parallelism0.01Planeness0.005Roughness 0.05Fit clearance0.005 ceramic ring& 99% alumina ceramic part