Ordered as HQ4031, this is an AS568-031 black Buna-N (Nitrile) 70 Shore A Quad-Ring built to an inside diameter of 1.739 in (44.17 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 1.879 in (47.73 mm). The quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.
Buna-N (Nitrile) is specified for an economical choice for high-volume maintenance programs and low compression set under sustained load. This material stands up to water, hydraulic fluids, and petroleum-based oils. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with polar solvents or automotive brake fluid. The profile itself contributes a parting line located away from the sealing surface and two sealing bands per contact face rather than one.
It sees regular use in fluid power, construction equipment, and hydraulic and pneumatic systems.
Order part number HQ4031, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.
Description **4031-366Y MINNESOTA RUBBER QUAD RING
Actual Inside Diameter 1.739 inch (44.17 mm)
Actual Outside Diameter 1.879 inch (47.73 mm)
Actual Cross Section 0.07 inch (1.78 mm)
Measurement System Imperial
Product Category O-Rings - Square/Quad - Premium