HSN (HNBR) 80 568-251

Ordered as HSN80251, this is an AS568-251 green HNBR (Hydrogenated Nitrile) 80 Shore A O-Ring built to an inside diameter of 5.109 in (129.77 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.387 in (136.83 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.

HNBR (Hydrogenated Nitrile) is widely chosen for the oil resistance of nitrile with substantially better heat capability, excellent abrasion and tear strength. Expect good resistance to heat and oxidation, ozone and weathering, and petroleum oils and fuels. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). Verify compatibility before use with ketones or esters.

You will find this material specified across commercial refrigeration, heavy-duty powertrain, and engine timing systems.

HSN80251 ships individually. Nominal inside diameter is listed as 5 1/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.