568-129 BUNA 70 SQUARE CUT RINGS

The SH70129 is an AS568-129 black Buna-N (Nitrile) 70 Shore A square profile Quad-Ring built to an inside diameter of 1.549 in (39.34 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.755 in (44.58 mm). This quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

As a material, Buna-N (Nitrile) is widely chosen for reliable performance in both static and dynamic service, low compression set under sustained load. It resists water, petroleum-based oils, and propane and butane. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ozone and direct sunlight are present.

Maintenance and OEM teams specify it across fluid power, agricultural equipment, and automotive.

This item is sold individually under part number SH70129. Unit weight is approximately 0.6746 g and nominal inside diameter is listed as 1 9/16 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.