HSN (HNBR) 80 568-443

APG stocks the HSN80443, an AS568-443 green HNBR (Hydrogenated Nitrile) 80 Shore A O-Ring measuring an inside diameter of 7.475 in (189.87 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 8.025 in (203.84 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.

As a material, HNBR (Hydrogenated Nitrile) is valued for excellent abrasion and tear strength, improved ozone and weathering resistance over standard nitrile. It resists modern refrigerants, petroleum oils and fuels, and sour gas and amine inhibitors. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). Exposure to strong oxidizing acids or esters will shorten service life.

Maintenance and OEM teams specify it across commercial refrigeration, heavy-duty powertrain, and automotive air conditioning.

Stocked as HSN80443 and sold individually. Unit weight is approximately 31.3354 g and nominal inside diameter is listed as 7 1/2 inch. 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.