568-042 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-042 black Viton® (FKM) 70 Shore A built to 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), catalogued under part number SV70042. It resists the spiral failure that affects round rings on long reciprocating strokes.

Viton® (FKM) delivers very low compression set at elevated temperature and outstanding high-temperature capability. It resists engine and transmission fluids, aggressive chemicals, and aromatic hydrocarbons. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Verify compatibility before use with hot water and steam or low-molecular-weight organic acids. The profile itself contributes a flat contact band that spreads sealing load across a wider area and a rectangular section that will not roll in the groove. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

You will find this material specified across high-temperature process equipment, chemical processing, and semiconductor equipment.

SV70042 ships individually. Nominal inside diameter is listed as 3 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.