Buna 70-438-Black-Pk2

SB-H70438-2 is an AS568-438 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 6.225 in (158.12 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.775 in (172.09 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint. Supplementary detail from the product record: 0.275CSX6.225"IDX6.775"OD.

Buna-N (Nitrile) is specified for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. Expect good resistance to many alcohols, petroleum-based oils, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with strong acids or ketones.

Common environments for this compound include automotive, general industrial maintenance, and agricultural equipment.

This item is sold by the bag under part number SB-H70438-2. Nominal inside diameter is listed as 6 1/4 inch. 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.