Q-433 BUNA 70 Q RING

Part number QH70433 is an AS568-433 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 5.475 in (139.07 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.025 in (153.04 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

As a material, Buna-N (Nitrile) offers low compression set under sustained load, strong abrasion and tear resistance. Expect good resistance to hydraulic fluids, propane and butane, and petroleum-based oils. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in automotive brake fluid or ozone and direct sunlight. The profile itself contributes lower compressive load required to achieve a seal and two sealing bands per contact face rather than one.

It sees regular use in hydraulic and pneumatic systems, general industrial maintenance, and automotive.

Reference part number QH70433 when ordering; the item is sold individually. Unit weight is approximately 23.22 g and nominal inside diameter is listed as 5 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.