568-391 GREEN HNBR (HSN) 70 ORINGS

APG stocks the HS70391, an AS568-391 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 21.953 in (557.61 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 22.373 in (568.27 mm). An o-ring remains the most cost-effective sealing element available for pressurized assemblies.

The material holds up against petroleum oils and fuels, modern refrigerants, and ozone and weathering. HNBR (Hydrogenated Nitrile) offers improved ozone and weathering resistance over standard nitrile, the oil resistance of nitrile with substantially better heat capability. Published continuous service range is -40°F (-40°C) to 325°F (162.8°C). It should not be specified for service in strong oxidizing acids or chlorinated hydrocarbons.

You will find this material specified across engine timing systems, automotive air conditioning, and oilfield and downhole equipment.

Reference part number HS70391 when ordering; the item is sold individually. Nominal inside diameter is listed as 22 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.