8-385 BLACK BUNA 90D BACK-UP RING

This back-up ring is supplied in AS568-385 black Buna-N (Nitrile) 90 Shore A measuring an inside diameter of 15.955 in (405.26 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 16.375 in (415.93 mm), catalogued under part number HB90385. It extends o-ring service life by supporting the seal against extrusion under high pressure.

Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Expect good resistance to water, many alcohols, and hydraulic fluids. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to automotive brake fluid or ozone and direct sunlight will shorten service life.

It sees regular use in construction equipment, automotive, and fluid power.

Order part number HB90385, sold individually. Unit weight is approximately 13.227 g and nominal inside diameter is listed as 16 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.