-438 BLACK BUNA 90D O-RING

This o-ring is supplied in AS568-438 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 6.225 in (158.12 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.775 in (172.09 mm), catalogued under part number H90438. It provides a reliable static or dynamic seal by deforming into its gland under assembly load.

The material holds up against water, many alcohols, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Published continuous service range is -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 construction equipment, automotive, and hydraulic and pneumatic systems.

Reference part number H90438 when ordering; the item is sold individually. Unit weight is approximately 26.144 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.