568-345 HSN90 DURO ORINGS

This o-ring is supplied in AS568-345 green HNBR (Hydrogenated Nitrile) 90 Shore A built to 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), catalogued under part number HSN90345. It provides a reliable static or dynamic seal by deforming into its gland under assembly load.

It resists heat and oxidation, modern refrigerants, and sour gas and amine inhibitors. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) offers long service life in refrigerant and oilfield duty, the oil resistance of nitrile with substantially better heat capability. Published continuous service range is -40°F (-40°C) to 325°F (162.8°C). Applications involving strong oxidizing acids or ketones call for a different compound.

Maintenance and OEM teams specify it across engine timing systems, automotive air conditioning, and oilfield and downhole equipment.

Reference part number HSN90345 when ordering; the item is sold individually. Unit weight is approximately 0.0097 g. Review your operating media and conditions against this specification before installation.