8-433 BLACK BUNA 90D BACK-UP RING

Part number HB90433 is an AS568-433 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 5.475 in (139.07 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.025 in (153.04 mm). A back-up ring bridges the extrusion gap so the primary seal holds its shape under load.

Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. The compound resists water, hydraulic fluids, and many alcohols. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with ozone and direct sunlight or automotive brake fluid.

Typical settings include agricultural equipment, construction equipment, and fluid power.

Order part number HB90433, sold individually. Unit weight is approximately 10.0089 g and nominal inside diameter is listed as 5 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.