-443 BLACK BUNA 90D O-RING

The H90443 is an AS568-443 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 7.475 in (189.87 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 8.025 in (203.84 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists petroleum-based oils, hydraulic fluids, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load, reliable performance in both static and dynamic service. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or strong acids will shorten service life.

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

H90443 ships individually. Unit weight is approximately 32.855 g. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.