The HSN90259 is an AS568-259 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 6.234 in (158.34 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.512 in (165.4 mm). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.
As a material, HNBR (Hydrogenated Nitrile) is known for excellent abrasion and tear strength, the oil resistance of nitrile with substantially better heat capability. It resists heat and oxidation, modern refrigerants, and petroleum oils and fuels. The material carries a published service range of -40°F (-40°C) to 325°F (162.8°C). It should not be specified for service in strong oxidizing acids or esters.
Maintenance and OEM teams specify it across heavy-duty powertrain, automotive air conditioning, and commercial refrigeration.
Stocked as HSN90259 and sold individually. Nominal inside diameter is listed as 6 1/4 inch. Review your operating media and conditions against this specification before installation.
Description 568-259 HSN90 DURO ORINGS
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 6.234 inch (158.34 mm)
Actual Outside Diameter 6.512 inch (165.4 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Premium