568-351 GREEN HNBR (HSN) 70 ORINGS

Ordered as HS70351, this is an AS568-351 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring built to an inside diameter of 4.725 in (120.02 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.145 in (130.68 mm). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists sour gas and amine inhibitors, modern refrigerants, and heat and oxidation. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) offers excellent abrasion and tear strength, 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). Exposure to ketones or chlorinated hydrocarbons will shorten service life.

Typical settings include engine timing systems, automotive air conditioning, and oilfield and downhole equipment.

HS70351 ships individually. Nominal inside diameter is listed as 4 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.