568-235 BLACK HNBR HSN70 O-Ring

Part number HSN70235 is an AS568-235 black HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 3.109 in (78.97 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.387 in (86.03 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

This material stands up to modern refrigerants, sour gas and amine inhibitors, and petroleum oils and fuels. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is valued for strong resistance to rapid gas decompression, excellent abrasion and tear strength. Continuous operating temperature is published at -40°F (-40°C) to 325°F (162.8°C). Applications involving strong oxidizing acids or esters call for a different compound.

You will find this material specified across engine timing systems, heavy-duty powertrain, and oilfield and downhole equipment.

Order part number HSN70235, sold individually. Unit weight is approximately 3.0467 g and nominal inside diameter is listed as 3 1/8 inch. Check the compound against your process media, pressure and temperature before committing to a design.