Buna 70-3mmCSx20mmID-Black-Pk50

APG stocks the SB-H3X20-50, a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 20 mm (0.787 in), a cross section of 3 mm (0.118 in), and an outside diameter of 26 mm (1.02 in). An o-ring remains the most cost-effective sealing element available for pressurized assemblies. Supplementary detail from the product record: 20MMIDX3MMCS.

It resists petroleum-based oils, water, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs and low compression set under sustained load. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ketones are present.

It sees regular use in agricultural equipment, hydraulic and pneumatic systems, and automotive.

This item is sold by the bag under part number SB-H3X20-50. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.