4201-366Y MINNESOTA RUBBER QUAD RING

Part number HQ4201 is an AS568-201 black Buna-N (Nitrile) 70 Shore A Quad-Ring supplied with an inside diameter of 0.171 in (4.34 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.449 in (11.4 mm). A quad-ring resists spiral failure in reciprocating service thanks to its multi-lobe geometry.

It resists greases and lubricants, propane and butane, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) is specified for low compression set under sustained load, strong abrasion and tear resistance. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes a parting line located away from the sealing surface and resistance to the spiral twisting that defeats round-section rings.

Typical settings include hydraulic and pneumatic systems, fluid power, and agricultural equipment.

Order part number HQ4201, sold individually. Nominal inside diameter is listed as 3/16 inch. Check the compound against your process media, pressure and temperature before committing to a design.