3.5MM CS X 31.2MM ID BLACK BUNA 70D

The H3.5X31.2 is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 31.2 mm (1.228 in), a cross section of 3.5 mm (0.138 in), and an outside diameter of 38.2 mm (1.5 in). This o-ring remains the most cost-effective sealing element available for pressurized assemblies. Additional detail on this item: Metric O-RING, JIS P31.5.

Buna-N (Nitrile) is known for strong abrasion and tear resistance, low compression set under sustained load. The compound resists petroleum-based oils, many alcohols, and water. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving polar solvents or ketones call for a different compound.

It sees regular use in hydraulic and pneumatic systems, general industrial maintenance, and agricultural equipment.

Stocked as H3.5X31.2 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. 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.