Q-235 BUNA 70 Q RING

The QH70235 is an AS568-235 black Buna-N (Nitrile) 70 Shore A quad profile Quad-Ring with an inside diameter of 3.109 in (78.97 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 3.387 in (86.03 mm). This quad-ring uses a four-lobed profile to create two sealing surfaces per side, reducing the squeeze needed to seal.

This material stands up to water, petroleum-based oils, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C).

Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and agricultural equipment.

This item is sold individually under part number QH70235. Unit weight is approximately 3.213 g and nominal inside diameter is listed as 3 1/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.