O ring, oring Main type: America O ring oring KIT, VITON O ring, Silicone O ring, Nitrile O ring, EPDM O ring, HNBR O ring, CR O ring, BUNA O ring, NBR O ring, O ring Characteristic: Bears the high temperature, has extremely good bears the climate, bears the ozone and bears the chemical properties, bears the petroleum. O ring authentication: USA NSF/FDA; German DVG/KTW; UK WRAS. O ring uses in astronautics, the automobile, the medical service, the drugs manufacture, the satellite, the valve, pump, the bathroom, the electron, the electric appliance, and so on industry. The precise O ring surface is smooth, none the needle eye, none the fragments, the precision achieves +/-0.03 mm to +/-0.08 mm. O ring series: AS 568 O ring, JIS PG O ring, GB O ring.