5.7MM CS X 61.6MM ID BLACK BUNA 90D

H90M5.7X61.6 is a black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 61.6 mm (2.425 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 73 mm (2.87 in). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint. Supplementary detail from the product record: Metric O-RING, JIS P62.

The compound resists many alcohols, petroleum-based oils, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) delivers 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 ketones or automotive brake fluid.

You will find this material specified across general industrial maintenance, hydraulic and pneumatic systems, and automotive.

Order part number H90M5.7X61.6, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.