Q-242 BUNA 70 Q RING

Part number QH70242 is an AS568-242 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 3.984 in (101.19 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.262 in (108.25 mm). A quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

As a material, Buna-N (Nitrile) is known for low compression set under sustained load, reliable performance in both static and dynamic service. It resists propane and butane, water, and many alcohols. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where strong acids or ozone and direct sunlight are present. The profile itself contributes two sealing bands per contact face rather than one and a parting line located away from the sealing surface.

Common environments for this compound include agricultural equipment, fluid power, and construction equipment.

Stocked as QH70242 and sold individually. Unit weight is approximately 3.775 g. As always, verify media compatibility and operating conditions against the requirements of your specific application. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.