3.5MM CS X 87MM ID BLACK BUNA 70D

Part number H3.5X87 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 87 mm (3.425 in), a cross section of 3.5 mm (0.138 in), and an outside diameter of 94 mm (3.7 in). An o-ring compresses into its gland to block fluid or gas migration across a joint.

The compound resists water, hydraulic fluids, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in ozone and direct sunlight or strong acids.

You will find this material specified across general industrial maintenance, fluid power, and construction equipment.

H3.5X87 ships individually. Unit weight is approximately 3.505 g. As always, verify media compatibility and operating conditions against the requirements of your specific application.