3.5MM CS X 78MM ID BLACK BUNA 70D

Part number H3.5X78 is a black Buna-N (Nitrile) 70 Shore A O-Ring supplied with an inside diameter of 78 mm (3.071 in), a cross section of 3.5 mm (0.138 in), and an outside diameter of 85 mm (3.35 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

It resists water, propane and butane, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for strong abrasion and tear resistance, reliable performance in both static and dynamic service. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).

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

Reference part number H3.5X78 when ordering; the item is sold individually. Unit weight is approximately 3.008 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.