4MM CS X 203MM ID BLACK BUNA 70D

Part number H4X203 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 203 mm (7.992 in), a cross section of 4 mm (0.157 in), and an outside diameter of 211 mm (8.31 in). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

The compound resists many alcohols, propane and butane, and petroleum-based oils. That behavior comes from the compound itself: Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ketones or ozone and direct sunlight are present.

Common environments for this compound include agricultural equipment, automotive, and construction equipment.

Reference part number H4X203 when ordering; the item is sold individually. Unit weight is approximately 9.9943 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.