Q-205 BUNA 70 Q RING

QH70205 is an AS568-205 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 0.421 in (10.69 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.699 in (17.75 mm). In service, this quad-ring provides a dual sealing band on each contact face for improved reliability.

It resists propane and butane, petroleum-based oils, and greases and lubricants. Buna-N (Nitrile) delivers an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with polar solvents or ketones. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and a parting line located away from the sealing surface.

Maintenance and OEM teams specify it across agricultural equipment, automotive, and fluid power.

Order part number QH70205, sold individually. Unit weight is approximately 0.5252 g and nominal inside diameter is listed as 7/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.