Buna 70-143-Black-Pk50

SB-H70143-50 is an AS568-143 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 2.425 in (61.6 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.631 in (66.83 mm). In service, this o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load. Source specification: 2.625IDX2.4375"ODX.0938"CS.

It resists propane and butane, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).

It sees regular use in automotive, agricultural equipment, and fluid power.

Order part number SB-H70143-50, sold by the bag. Nominal inside diameter is listed as 2 7/16 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.