8-368 BLACK BUNA 90D BACK-UP RING

APG stocks the HB90368, an AS568-368 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 7.725 in (196.22 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 8.145 in (206.88 mm). A back-up ring installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.

Buna-N (Nitrile) is specified here for economical choice for high-volume maintenance programs, reliable performance in both static and dynamic service. Expect good resistance to many alcohols, petroleum-based oils, and propane and butane. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Applications involving strong acids or ketones call for a different compound.

Typical settings include hydraulic and pneumatic systems, construction equipment, and fluid power.

HB90368 ships individually. Unit weight is approximately 6.588 g. Review your operating media and conditions against this specification before installation.