Alumina ceramics bushing&ceramic structure part Industry ceramic Wear resistance High hardness Used ... ceramic parts include, tube, rod, plate, disc, wafer, ring, seal, bearing, valves, pump plunger, beam, roller, shaft, screw, washer, sleeve, hunger ... 0.005Parallelism0.01Planeness0.005Roughness 0.05Fit clearance0.005 Alumina ceramics bushing&ceramic structure part