3.55MM CS X 20MM ID BLACK BUNA 70D

The H3.55X20 is a black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 20 mm (0.787 in), a cross section of 3.55 mm (0.14 in), and an outside diameter of 27.1 mm (1.07 in). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Expect good resistance to propane and butane, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is valued for strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or strong acids call for a different compound.

Common environments for this compound include construction equipment, general industrial maintenance, and hydraulic and pneumatic systems.

Stocked as H3.55X20 and sold individually. Unit weight is approximately 0.8696 g. 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.