568-918 HSN90 DURO ORINGS

APG stocks the HSN90918, an AS568-918 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring measuring an inside diameter of 1.355 in (34.42 mm), a cross section of 0.116 in (2.95 mm), and an outside diameter of 1.587 in (40.31 mm). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

Expect good resistance to petroleum oils and fuels, modern refrigerants, and sour gas and amine inhibitors. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is widely chosen for improved ozone and weathering resistance over standard nitrile, strong resistance to rapid gas decompression. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). It is not the right choice where esters or ketones are present.

Maintenance and OEM teams specify it across oilfield and downhole equipment, heavy-duty powertrain, and commercial refrigeration.

HSN90918 ships individually. Nominal inside diameter is listed as 1 1/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to 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.