568-439 GREEN HNBR (HSN) 70 ORINGS

Part number HS70439 is an AS568-439 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

HNBR (Hydrogenated Nitrile) is specified here for oil resistance of nitrile with substantially better heat capability and strong resistance to rapid gas decompression. The material holds up against petroleum oils and fuels, heat and oxidation, and modern refrigerants. Published continuous service range is -40°F (-40°C) to 325°F (162.8°C). Applications involving ketones or chlorinated hydrocarbons call for a different compound.

Typical settings include engine timing systems, commercial refrigeration, and oilfield and downhole equipment.

Stocked as HS70439 and sold individually. Nominal inside diameter is listed as 6 1/2 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.