Q-255 BUNA 70 Q RING

Ordered as QH70255, this is an AS568-255 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 5.609 in (142.47 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 5.887 in (149.53 mm). The quad-ring provides a dual sealing band on each contact face for improved reliability.

It resists greases and lubricants, water, and propane and butane. Buna-N (Nitrile) delivers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where polar solvents 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.

Typical settings include construction equipment, fluid power, and automotive.

Reference part number QH70255 when ordering; the item is sold individually. Unit weight is approximately 5.89 g and nominal inside diameter is listed as 5 5/8 inch. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.