-028 BLACK BUNA 90D O-RING

Ordered as H90028, this is an AS568-028 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 1.364 in (34.65 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.504 in (38.2 mm). The o-ring remains the most cost-effective sealing element available for pressurized assemblies.

It resists water, hydraulic fluids, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in strong acids or ozone and direct sunlight.

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

This item is sold individually under part number H90028. Unit weight is approximately 0.4053 g and nominal inside diameter is listed as 1 3/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.