Q-393 BUNA 70 Q RING

Ordered as QH70393, this is an AS568-393 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 23.94 in (608.08 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 24.36 in (618.74 mm). The quad-ring seats in a standard o-ring gland while offering improved dynamic performance.

Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer, reliable performance in both static and dynamic service. The material holds up against petroleum-based oils, water, and greases and lubricants. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

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

QH70393 ships individually. Nominal inside diameter is listed as 24 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.