Q-425 BUNA 70 Q RING

APG stocks the QH70425, an AS568-425 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 4.475 in (113.67 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.025 in (127.64 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 reliable performance in both static and dynamic service, strong abrasion and tear resistance. This material stands up to many alcohols, petroleum-based oils, and propane and butane. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes lower compressive load required to achieve a seal and resistance to the spiral twisting that defeats round-section rings.

It sees regular use in automotive, construction equipment, and general industrial maintenance.

QH70425 ships individually. Unit weight is approximately 19.47 g and nominal inside diameter is listed as 4 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.