Buna 70-329-Black-Pk50

Part number SB-H70329-50 is an AS568-329 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 1.975 in (50.17 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.395 in (60.83 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load. This item is further identified as 2.375IDX2"ODX.1875"CS.

It resists petroleum-based oils, water, and many alcohols. Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or strong acids call for a different compound.

Maintenance and OEM teams specify it across hydraulic and pneumatic systems, automotive, and fluid power.

SB-H70329-50 ships by the bag. 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.