8-116 BLACK BUNA 90D BACK-UP RING

Part number HB90116 is an AS568-116 black Buna-N (Nitrile) 90 Shore A Back-Up Ring supplied with an inside diameter of 0.737 in (18.72 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 0.943 in (23.95 mm). A back-up ring extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, low compression set under sustained load. The compound resists greases and lubricants, propane and butane, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ozone and direct sunlight or automotive brake fluid will shorten service life.

Typical settings include construction equipment, general industrial maintenance, and automotive.

Reference part number HB90116 when ordering; the item is sold individually. Unit weight is approximately 0.246 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.