5.3MM CS X 250MM ID BLACK BUNA 70D

APG stocks the H5.3X250, a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 250 mm (9.843 in), a cross section of 5.3 mm (0.209 in), and an outside diameter of 260.6 mm (10.26 in). An o-ring remains the most cost-effective sealing element available for pressurized assemblies.

The compound resists many alcohols, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load and the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where polar solvents or automotive brake fluid are present.

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

Stocked as H5.3X250 and sold individually. Unit weight is approximately 21.575 g. Review your operating media and conditions against this specification before installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.