568-138 GREEN HNBR (HSN) 70 ORINGS

The HS70138 is an AS568-138 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring built to an inside diameter of 2.112 in (53.64 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.318 in (58.88 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists heat and oxidation, ozone and weathering, and petroleum oils and fuels. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) delivers long service life in refrigerant and oilfield duty, improved ozone and weathering resistance over standard nitrile. Rated temperature range runs from -40°F (-40°C) to 325°F (162.8°C) in continuous service.

Maintenance and OEM teams specify it across commercial refrigeration, engine timing systems, and automotive air conditioning.

Order part number HS70138, sold individually. Nominal inside diameter is listed as 2 1/8 inch. Review your operating media and conditions against this specification before installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.