5.7MM CS X 139.3MM ID BLACK BUNA 90D

The H90M5.7X139.3 is a black Buna-N (Nitrile) 90 Shore A O-Ring with an inside diameter of 139.3 mm (5.484 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 150.7 mm (5.93 in). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

It resists greases and lubricants, hydraulic fluids, and water. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C).

You will find this material specified across automotive, hydraulic and pneumatic systems, and fluid power.

Order part number H90M5.7X139.3, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.