Buna 70-237-Black-Pk25

SB-H70237-25 is an AS568-237 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 3.359 in (85.32 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.637 in (92.38 mm). In service, this o-ring creates a positive seal at flange, piston and rod interfaces without added hardware. This item is further identified as 0.139CSX3.359"IDX3.637"OD.

Expect good resistance to water, greases and lubricants, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).

Typical settings include automotive, fluid power, and general industrial maintenance.

This item is sold by the bag under part number SB-H70237-25. Application requirements vary, so validate compatibility with your process conditions prior to installation. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.