8-310 BLACK BUNA 90D BACK-UP RING

The HB90310 is an AS568-310 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 0.475 in (12.07 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.895 in (22.73 mm). This 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 reliable performance in both static and dynamic service, economical choice for high-volume maintenance programs. The material holds up against petroleum-based oils, greases and lubricants, and propane and butane. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving ozone and direct sunlight or automotive brake fluid call for a different compound.

Common environments for this compound include hydraulic and pneumatic systems, automotive, and agricultural equipment.

Order part number HB90310, sold individually. Unit weight is approximately 0.588 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.