Q-355 BUNA 70 Q RING

Part number QH70355 is an AS568-355 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring with an inside diameter of 5.225 in (132.72 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.645 in (143.38 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

As a material, Buna-N (Nitrile) is valued for reliable performance in both static and dynamic service, low compression set under sustained load. This material stands up to many alcohols, propane and butane, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to automotive brake fluid or strong acids will shorten service life.

It sees regular use in construction equipment, hydraulic and pneumatic systems, and automotive.

Reference part number QH70355 when ordering; the item is sold individually. Nominal inside diameter is listed as 5 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.