8-343 BLACK BUNA 90D BACK-UP RING

APG stocks the HB90343, an AS568-343 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 3.725 in (94.62 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.145 in (105.28 mm). A back-up ring allows a standard o-ring to operate at higher pressures than it could unsupported.

This material stands up to many alcohols, hydraulic fluids, and water. Buna-N (Nitrile) delivers strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving polar solvents or strong acids call for a different compound.

Common environments for this compound include general industrial maintenance, agricultural equipment, and automotive.

Reference part number HB90343 when ordering; the item is sold individually. Unit weight is approximately 3.2953 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.