568-261 HSN90 DURO ORINGS

APG stocks the HSN90261, an AS568-261 green HNBR (Hydrogenated Nitrile) 90 Shore A O-Ring supplied with an inside diameter of 6.734 in (171.04 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 7.012 in (178.1 mm). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists modern refrigerants, ozone and weathering, and sour gas and amine inhibitors. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is widely chosen for improved ozone and weathering resistance over standard nitrile, the oil resistance of nitrile with substantially better heat capability. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C).

It sees regular use in commercial refrigeration, automotive air conditioning, and oilfield and downhole equipment.

Reference part number HSN90261 when ordering; the item is sold individually. Unit weight is approximately 6.9882 g. Check the compound against your process media, pressure and temperature before committing to a design.