-178 BLACK BUNA 50D O-RING

APG stocks the H50178, an AS568-178 black Buna-N (Nitrile) 50 Shore A O-Ring with an inside diameter of 9.737 in (247.32 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.943 in (252.55 mm). An o-ring remains the most cost-effective sealing element available for pressurized assemblies.

This material stands up to water, petroleum-based oils, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with strong acids or automotive brake fluid.

You will find this material specified across agricultural equipment, fluid power, and construction equipment.

H50178 ships individually. Nominal inside diameter is listed as 9 3/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.