Q-249 BUNA 70 Q RING

The QH70249 is an AS568-249 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 4.859 in (123.42 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.137 in (130.48 mm). This quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

Expect good resistance to water, greases and lubricants, and petroleum-based oils. Buna-N (Nitrile) is valued for low compression set under sustained load, strong abrasion and tear resistance. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Applications involving ozone and direct sunlight or polar solvents call for a different compound. The profile itself contributes two sealing bands per contact face rather than one and a parting line located away from the sealing surface.

It sees regular use in construction equipment, agricultural equipment, and automotive.

Reference part number QH70249 when ordering; the item is sold individually. Unit weight is approximately 4.7833 g and nominal inside diameter is listed as 4 7/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.