568-390 FKM 75 SQUARE CUT RINGS

The SV70390 is an AS568-390 black Viton® (FKM) 70 Shore A Square-Cut Ring with an inside diameter of 20.953 in (532.21 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 21.373 in (542.87 mm). This square-cut ring provides an economical lathe-cut alternative where a moulded o-ring is not required.

Viton® (FKM) is widely chosen for long service life in hot, chemically aggressive environments and outstanding high-temperature capability. Expect good resistance to chlorinated solvents, many acids, and engine and transmission fluids. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C). It should not be specified for service in ketones and esters or hot water and steam. The profile itself contributes simple lathe-cut manufacture at low tooling cost and a flat contact band that spreads sealing load across a wider area. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

It sees regular use in chemical processing, oil and gas, and automotive fuel systems.

SV70390 ships individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. For a size or compound outside the standard catalog, APG can quote from a print or sample.