Buna 70-440-Black-Pk2

The SB-H70440-2 is an AS568-440 black Buna-N (Nitrile) 70 Shore A O-Ring measuring 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. Additional detail on this item: 0.275CSX6.725"IDX7.275"OD.

The compound resists petroleum-based oils, greases and lubricants, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where ozone and direct sunlight or strong acids are present.

Maintenance and OEM teams specify it across general industrial maintenance, agricultural equipment, and construction equipment.

Reference part number SB-H70440-2 when ordering; the item is sold by the bag. Review your operating media and conditions against this specification before installation.