Q-356 BUNA 70 Q RING

Part number QH70356 is an AS568-356 black Buna-N (Nitrile) 70 Shore A Quad-Ring with an inside diameter of 5.35 in (135.89 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.77 in (146.56 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

It resists petroleum-based oils, water, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load and an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or strong acids. 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, hydraulic and pneumatic systems, and general industrial maintenance.

This item is sold individually under part number QH70356. Check the compound against your process media, pressure and temperature before committing to a design.