568-258 HSN90 DURO ORINGS

Part number HSN90258 is an AS568-258 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring with an inside diameter of 5.984 in (151.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.262 in (159.05 mm). An 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 widely chosen for the oil resistance of nitrile with substantially better heat capability, improved ozone and weathering resistance over standard nitrile. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). It is not the right choice where ketones or esters are present.

Typical settings include automotive air conditioning, engine timing systems, and oilfield and downhole equipment.

Reference part number HSN90258 when ordering; the item is sold individually. Nominal inside diameter is listed as 6 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.