4MM CS X 212MM ID BLACK BUNA 70D

Part number H4X212 is a black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 212 mm (8.346 in), a cross section of 4 mm (0.157 in), and an outside diameter of 220 mm (8.66 in). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

This material stands up to many alcohols, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is known for low compression set under sustained load and an economical choice for high-volume maintenance programs. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service.

You will find this material specified across hydraulic and pneumatic systems, automotive, and agricultural equipment.

Reference part number H4X212 when ordering; the item is sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.