-156 BLACK BUNA 90D O-RING

The H90156 is an AS568-156 black Buna-N (Nitrile) 90 Shore A O-Ring measuring an inside diameter of 4.237 in (107.62 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 4.443 in (112.85 mm). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.

As a material, Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, strong abrasion and tear resistance. Expect good resistance to greases and lubricants, hydraulic fluids, and water. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to automotive brake fluid or ozone and direct sunlight will shorten service life.

Maintenance and OEM teams specify it across general industrial maintenance, agricultural equipment, and fluid power.

H90156 ships individually. Unit weight is approximately 2.5233 g and nominal inside diameter is listed as 4 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.