568-172 BUNA 70 SQUARE CUT RINGS

Ordered as SH70172, this is an AS568-172 black Buna-N (Nitrile) 70 Shore A square profile Quad-Ring supplied with an inside diameter of 8.237 in (209.22 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 8.443 in (214.45 mm). The quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

It resists greases and lubricants, many alcohols, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) delivers strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Applications involving ozone and direct sunlight or polar solvents call for a different compound.

Typical settings include general industrial maintenance, agricultural equipment, and fluid power.

This item is sold individually under part number SH70172. Nominal inside diameter is listed as 8 1/4 inch. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.