This quad-ring is supplied in AS568-040 black Buna-N (Nitrile) 70 Shore A built to an inside diameter of 2.864 in (72.75 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 3.004 in (76.3 mm), catalogued under part number HQ4040. It resists spiral failure in reciprocating service thanks to its multi-lobe geometry.
The compound resists propane and butane, water, and greases and lubricants. Buna-N (Nitrile) is valued for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in ketones or automotive brake fluid. The profile itself contributes two sealing bands per contact face rather than one and resistance to the spiral twisting that defeats round-section rings.
Maintenance and OEM teams specify it across automotive, agricultural equipment, and fluid power.
This item is sold individually under part number HQ4040. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description **4040-366Y MINNESOTA RUBBER QUAD RING
Actual Inside Diameter 2.864 inch (72.75 mm)
Actual Outside Diameter 3.004 inch (76.3 mm)
Actual Cross Section 0.07 inch (1.78 mm)
Measurement System Imperial
Product Category O-Rings - Square/Quad - Premium