-428 BLACK BUNA 90D O-RING

H90428 is an AS568-428 black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 4.85 in (123.19 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.4 in (137.16 mm). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

As a material, Buna-N (Nitrile) is valued for low compression set under sustained load and an economical choice for high-volume maintenance programs. Expect good resistance to water, many alcohols, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It should not be specified for service in ozone and direct sunlight or strong acids.

It sees regular use in construction equipment, general industrial maintenance, and fluid power.

H90428 ships individually. Unit weight is approximately 22.221 g. 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.