Q-178 BUNA 70 Q RING

Ordered as QH70178, this is an AS568-178 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 9.737 in (247.32 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 9.943 in (252.55 mm). The quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

As a material, Buna-N (Nitrile) is widely chosen for strong abrasion and tear resistance, low compression set under sustained load. Expect good resistance to hydraulic fluids, water, and many alcohols. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with polar solvents or strong acids. 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 fluid power, general industrial maintenance, and agricultural equipment.

Stocked as QH70178 and sold individually. Nominal inside diameter is listed as 9 3/4 inch. Review your operating media and conditions against this specification before installation.