4.5MM CS X 37MM ID BLACK BUNA 70D

H4.5X37 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 37 mm (1.457 in), a cross section of 4.5 mm (0.177 in), and an outside diameter of 46 mm (1.81 in). In service, this o-ring remains the most cost-effective sealing element available for pressurized assemblies.

This material stands up to greases and lubricants, petroleum-based oils, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.

Typical settings include fluid power, general industrial maintenance, and hydraulic and pneumatic systems.

Stocked as H4.5X37 and sold individually. Unit weight is approximately 0.0026 g. Check the compound against your process media, pressure and temperature before committing to a design. 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.