568-278 HSN90 DURO ORINGS

Part number HSN90278 is an AS568-278 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring with an inside diameter of 11.984 in (304.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 12.262 in (311.45 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

HNBR (Hydrogenated Nitrile) is known for long service life in refrigerant and oilfield duty, excellent abrasion and tear strength. The material holds up against modern refrigerants, heat and oxidation, and sour gas and amine inhibitors. Rated temperature range runs from -40°F (-40°C) to 325°F (162.8°C) in continuous service. Applications involving ketones or strong oxidizing acids call for a different compound.

It sees regular use in automotive air conditioning, engine timing systems, and commercial refrigeration.

Reference part number HSN90278 when ordering; the item is sold individually. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.