Q-340 BUNA 70 Q RING

APG stocks the QH70340, an AS568-340 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 3.35 in (85.09 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.77 in (95.76 mm). A quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

The material holds up against greases and lubricants, water, and petroleum-based oils. Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs and low compression set under sustained load. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where polar solvents or ozone and direct sunlight are present. The profile itself contributes lower compressive load required to achieve a seal and two sealing bands per contact face rather than one.

Maintenance and OEM teams specify it across agricultural equipment, fluid power, and general industrial maintenance.

Reference part number QH70340 when ordering; the item is sold individually. Unit weight is approximately 7.5978 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.