568-178 HSN90 DURO ORINGS

Ordered as HSN90178, this is an AS568-178 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring with an inside diameter of 9.737 in (247.32 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.943 in (252.55 mm). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The material holds up against petroleum oils and fuels, ozone and weathering, and sour gas and amine inhibitors. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is specified for improved ozone and weathering resistance over standard nitrile, the oil resistance of nitrile with substantially better heat capability. Continuous operating temperature is published at -40°F (-40°C) to 325°F (162.8°C). Verify compatibility before use with ketones or strong oxidizing acids.

You will find this material specified across engine timing systems, heavy-duty powertrain, and automotive air conditioning.

Reference part number HSN90178 when ordering; the item is sold individually. Check the compound against your process media, pressure and temperature before committing to a design. 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.