-031 BLACK BUNA 90D O-RING

H90031 is an AS568-031 black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 1.739 in (44.17 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.879 in (47.73 mm). In service, this o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, low compression set under sustained load. This material stands up to hydraulic fluids, greases and lubricants, and petroleum-based oils. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or polar solvents call for a different compound.

Maintenance and OEM teams specify it across construction equipment, agricultural equipment, and hydraulic and pneumatic systems.

This item is sold individually under part number H90031. Unit weight is approximately 0.4855 g and nominal inside diameter is listed as 1 3/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.