-349 BLACK BUNA 70D O-RING

This o-ring is supplied in AS568-349 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 4.475 in (113.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.895 in (124.33 mm), catalogued under part number H70349. It compresses into its gland to block fluid or gas migration across a joint.

The compound resists water, petroleum-based oils, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to polar solvents or ketones will shorten service life.

You will find this material specified across automotive, agricultural equipment, and hydraulic and pneumatic systems.

Reference part number H70349 when ordering; the item is sold individually. Unit weight is approximately 12.5784 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.