This back-up ring is supplied in AS568-375 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 9.475 in (240.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 9.895 in (251.33 mm), catalogued under part number HB90375. It installs on the low-pressure side of an o-ring to prevent extrusion into the clearance gap at elevated pressure.
As a material, Buna-N (Nitrile) is valued for low compression set under sustained load, reliable performance in both static and dynamic service. The material holds up against many alcohols, petroleum-based oils, and water. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C).
Common environments for this compound include agricultural equipment, automotive, and general industrial maintenance.
HB90375 ships individually. Unit weight is approximately 8.165 g. Check the compound against your process media, pressure and temperature before committing to a design.
Description 8-375 BLACK BUNA 90D BACK-UP RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 9.475 inch (240.67 mm)
Actual Outside Diameter 9.895 inch (251.33 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings