5.7MM CS X 124.3MM ID BLACK BUNA 90D

APG stocks the H90M5.7X124.3, a black Buna-N (Nitrile) 90 Shore A O-Ring built to an inside diameter of 124.3 mm (4.894 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 135.7 mm (5.34 in). An o-ring compresses into its gland to block fluid or gas migration across a joint.

The material holds up against many alcohols, petroleum-based oils, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving automotive brake fluid or strong acids call for a different compound.

You will find this material specified across automotive, hydraulic and pneumatic systems, and construction equipment.

Reference part number H90M5.7X124.3 when ordering; the item is sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.