*568-236 BLACK HNBR HSN70 ORINGS

Ordered as HSN70236, this is an AS568-236 black HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring measuring an inside diameter of 3.234 in (82.14 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.512 in (89.2 mm). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

The material holds up against petroleum oils and fuels, heat and oxidation, and sour gas and amine inhibitors. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is valued for strong resistance to rapid gas decompression, 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. Exposure to strong oxidizing acids or chlorinated hydrocarbons will shorten service life.

Common environments for this compound include engine timing systems, oilfield and downhole equipment, and heavy-duty powertrain.

HSN70236 ships individually. Unit weight is approximately 3.1295 g and nominal inside diameter is listed as 3 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.