5.7MM CS X 139.6MM ID BLACK BUNA 70D

H5.7X139.6 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 139.6 mm (5.496 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 151 mm (5.94 in). In service, this o-ring remains the most cost-effective sealing element available for pressurized assemblies. This item is further identified as Metric O-RING, JIS P140.

The material holds up against many alcohols, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load, reliable performance in both static and dynamic service. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or strong acids are present.

Common environments for this compound include hydraulic and pneumatic systems, construction equipment, and fluid power.

Reference part number H5.7X139.6 when ordering; the item is sold individually. Unit weight is approximately 14.082 g. Review your operating media and conditions against this specification before installation.