4MM CS X 227MM ID BLACK BUNA 70D

This o-ring is supplied in black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 227 mm (8.937 in), a cross section of 4 mm (0.157 in), and an outside diameter of 235 mm (9.25 in), catalogued under part number H4X227. It provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The material holds up against water, petroleum-based oils, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ketones are present.

Maintenance and OEM teams specify it across fluid power, general industrial maintenance, and hydraulic and pneumatic systems.

H4X227 ships individually. Unit weight is approximately 11.1375 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. 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.