3MM CS X 74.5MM ID BLACK BUNA 90D

Part number H90M3X74.5 is a black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 74.5 mm (2.933 in), a cross section of 3 mm (0.118 in), and an outside diameter of 80.5 mm (3.17 in). An o-ring compresses into its gland to block fluid or gas migration across a joint.

The material holds up against water, petroleum-based oils, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or automotive brake fluid will shorten service life.

Typical settings include hydraulic and pneumatic systems, general industrial maintenance, and construction equipment.

Stocked as H90M3X74.5 and sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.