HB90326 is an AS568-326 black Buna-N (Nitrile) 90 Shore A Back-Up Ring with an inside diameter of 1.6 in (40.64 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.02 in (51.31 mm). In service, this back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.
The material holds up against many alcohols, hydraulic fluids, and petroleum-based oils. Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, strong abrasion and tear resistance. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).
Common environments for this compound include general industrial maintenance, agricultural equipment, and construction equipment.
Stocked as HB90326 and sold individually. Unit weight is approximately 1.5453 g. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.
Description 8-326 BLACK BUNA 90D BACK-UP RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 1.6 inch (40.64 mm)
Actual Outside Diameter 2.02 inch (51.31 mm)
Measurement System Imperial
Product Category O-Rings - Backup Rings