-443 BLACK BUNA 50D O-RING

Part number H50443 is an AS568-443 black Buna-N (Nitrile) 50 Shore A O-Ring measuring 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). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The compound resists hydraulic fluids, petroleum-based oils, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or ketones will shorten service life.

Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and automotive.

H50443 ships individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.