This back-up ring is supplied in AS568-229 black Buna-N (Nitrile) 90 Shore A with an inside diameter of 2.359 in (59.92 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 2.637 in (66.98 mm), catalogued under part number HB90229. It extends o-ring service life by supporting the seal against extrusion under high pressure.
As a material, Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. This material stands up to hydraulic fluids, many alcohols, and water. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).
Typical settings include fluid power, automotive, and general industrial maintenance.
Order part number HB90229, sold individually. Unit weight is approximately 0.8957 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description 8-229 BLACK BUNA 90D BACK-UP RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 2.359 inch (59.92 mm)
Actual Outside Diameter 2.637 inch (66.98 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings