568-378 HSN90 DURO ORINGS

Ordered as HSN90378, this is an AS568-378 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 10.475 in (266.07 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 10.895 in (276.73 mm). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

This material stands up to sour gas and amine inhibitors, petroleum oils and fuels, and modern refrigerants. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is specified for long service life in refrigerant and oilfield duty, improved ozone and weathering resistance over standard nitrile. Rated temperature range runs from -40°F (-40°C) to 325°F (162.8°C) in continuous service. Verify compatibility before use with strong oxidizing acids or chlorinated hydrocarbons.

Typical settings include oilfield and downhole equipment, commercial refrigeration, and heavy-duty powertrain.

Stocked as HSN90378 and sold individually. Review your operating media and conditions against this specification before installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.