568-420 GREEN HNBR (HSN) 70 ORINGS

Ordered as HS70420, this is an AS568-420 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring with an inside diameter of 3.85 in (97.79 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.4 in (111.76 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.

As a material, HNBR (Hydrogenated Nitrile) is widely chosen for improved ozone and weathering resistance over standard nitrile, strong resistance to rapid gas decompression. The compound resists heat and oxidation, petroleum oils and fuels, and sour gas and amine inhibitors. The material carries a published service range of -40°F (-40°C) to 325°F (162.8°C). Applications involving chlorinated hydrocarbons or esters call for a different compound.

Maintenance and OEM teams specify it across oilfield and downhole equipment, heavy-duty powertrain, and engine timing systems.

Stocked as HS70420 and sold individually. Nominal inside diameter is listed as 3 7/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.