HSN (HNBR) 80 568-345

HSN80345 is an AS568-345 green HNBR (Hydrogenated Nitrile) 80 Shore A O-Ring with an inside diameter of 3.975 in (100.97 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.395 in (111.63 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.

The compound resists modern refrigerants, ozone and weathering, and petroleum oils and fuels. HNBR (Hydrogenated Nitrile) delivers improved ozone and weathering resistance over standard nitrile, strong resistance to rapid gas decompression. The material carries a published service range of -40°F (-40°C) to 325°F (162.8°C).

Maintenance and OEM teams specify it across commercial refrigeration, automotive air conditioning, and oilfield and downhole equipment.

Stocked as HSN80345 and sold individually. Unit weight is approximately 9.548 g and nominal inside diameter is listed as 4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. For a size or compound outside the standard catalog, APG can quote from a print or sample.