Buna 70-439-Black-Pk5

The SB-H70439-5 is an AS568-439 black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 6.475 in (164.47 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 7.025 in (178.44 mm). This o-ring compresses into its gland to block fluid or gas migration across a joint. Source specification: 7IDX6.5"ODX.25"CS.

As a material, Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. This material stands up to propane and butane, many alcohols, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Exposure to ketones or polar solvents will shorten service life.

Common environments for this compound include general industrial maintenance, fluid power, and hydraulic and pneumatic systems.

This item is sold by the bag under part number SB-H70439-5. Nominal inside diameter is listed as 6 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.