*4042-366Y MINNESOTA RUBBER QUAD RING

Ordered as HQ4042, this is an AS568-042 black Buna-N (Nitrile) 70 Shore A Quad-Ring measuring an inside diameter of 3.239 in (82.27 mm), a cross section of 0.07 in (1.78 mm), and an outside diameter of 3.379 in (85.83 mm). The quad-ring provides a dual sealing band on each contact face for improved reliability.

The material holds up against water, many alcohols, and petroleum-based oils. Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where automotive brake fluid or ketones are present. The profile itself contributes resistance to the spiral twisting that defeats round-section rings and two sealing bands per contact face rather than one.

It sees regular use in construction equipment, hydraulic and pneumatic systems, and fluid power.

Order part number HQ4042, sold individually. Nominal inside diameter is listed as 3 1/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.