-139 BLACK BUNA 90D O-RING

H90139 is an AS568-139 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 2.175 in (55.25 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.381 in (60.48 mm). In service, this o-ring remains the most cost-effective sealing element available for pressurized assemblies.

This material stands up to greases and lubricants, propane and butane, and many alcohols. Buna-N (Nitrile) is widely chosen for an economical choice for high-volume maintenance programs and low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with automotive brake fluid or strong acids.

Common environments for this compound include automotive, hydraulic and pneumatic systems, and construction equipment.

Order part number H90139, sold individually. Unit weight is approximately 1.3704 g and nominal inside diameter is listed as 2 3/16 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.