568-250 BLACK HNBR HSN70 O-Ring

Ordered as HSN70250, this is an AS568-250 black HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring built to an inside diameter of 4.984 in (126.59 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.262 in (133.65 mm). The o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

As a material, HNBR (Hydrogenated Nitrile) is known for long service life in refrigerant and oilfield duty, improved ozone and weathering resistance over standard nitrile. The compound resists modern refrigerants, sour gas and amine inhibitors, and ozone and weathering. The material carries a published service range of -40°F (-40°C) to 325°F (162.8°C).

Maintenance and OEM teams specify it across oilfield and downhole equipment, automotive air conditioning, and heavy-duty powertrain.

This item is sold individually under part number HSN70250. Unit weight is approximately 4.7723 g. Check the compound against your process media, pressure and temperature before committing to a design. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.