Q-330 BUNA 70 Q RING

Ordered as QH70330, this is an AS568-330 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 2.1 in (53.34 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 2.52 in (64.01 mm). The 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 petroleum-based oils, water, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load and an economical choice for high-volume maintenance programs. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and lower compressive load required to achieve a seal.

You will find this material specified across general industrial maintenance, agricultural equipment, and automotive.

QH70330 ships individually. Unit weight is approximately 5.295 g. Review your operating media and conditions against this specification before installation.