-404 BLACK BUNA 70D O-RING

H70404 is an AS568-404 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 1.85 in (46.99 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 2.4 in (60.96 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.

The compound resists greases and lubricants, water, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving strong acids or polar solvents call for a different compound.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, agricultural equipment, and fluid power.

Reference part number H70404 when ordering; the item is sold individually. Unit weight is approximately 7.942 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.