Q-348 BUNA 70 Q RING

This quad-ring is supplied in AS568-348 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 4.35 in (110.49 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.77 in (121.16 mm), catalogued under part number QH70348. It seats in a standard o-ring gland while offering improved dynamic performance.

The material holds up against water, greases and lubricants, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load, strong abrasion and tear resistance. 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 ozone and direct sunlight or ketones. The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

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

This item is sold individually under part number QH70348. Unit weight is approximately 10.044 g and nominal inside diameter is listed as 4 3/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.