568-390 BUNA 70 SQUARE CUT RINGS

Part number SH70390 is an AS568-390 black Buna-N (Nitrile) 70 Shore A square profile Quad-Ring supplied with an inside diameter of 20.953 in (532.21 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 21.373 in (542.87 mm). A quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

The material holds up against greases and lubricants, propane and butane, and hydraulic fluids. Buna-N (Nitrile) is valued for low compression set under sustained load and an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving ozone and direct sunlight or strong acids call for a different compound.

You will find this material specified across agricultural equipment, construction equipment, and fluid power.

Order part number SH70390, sold individually. Nominal inside diameter is listed as 21 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.