-440 BLACK BUNA 70D O-RING

The H70440 is an AS568-440 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 6.725 in (170.82 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.275 in (184.79 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The compound resists many alcohols, petroleum-based oils, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across fluid power, automotive, and construction equipment.

H70440 ships individually. Unit weight is approximately 26.455 g and nominal inside diameter is listed as 6 3/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.