568-423 HSN90 DURO ORINGS

APG stocks the HSN90423, an AS568-423 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring measuring an inside diameter of 4.225 in (107.32 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.775 in (121.29 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

HNBR (Hydrogenated Nitrile) is specified here for oil resistance of nitrile with substantially better heat capability, improved ozone and weathering resistance over standard nitrile. The material holds up against ozone and weathering, sour gas and amine inhibitors, and heat and oxidation. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). Exposure to chlorinated hydrocarbons or ketones will shorten service life.

Common environments for this compound include heavy-duty powertrain, commercial refrigeration, and engine timing systems.

Order part number HSN90423, sold individually. Nominal inside diameter is listed as 4 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.