-470 BLACK FKM 70D SQUARE RING

This square-cut ring is supplied in AS568-470 black Viton® (FKM) 70 Shore A measuring an inside diameter of 20.955 in (532.26 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 21.505 in (546.23 mm), catalogued under part number SV70470. It resists the spiral failure that affects round rings on long reciprocating strokes.

Viton® (FKM) is specified here for industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. Expect good resistance to chlorinated solvents, engine and transmission fluids, and many acids. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). The profile itself contributes a flat contact band that spreads sealing load across a wider area and simple lathe-cut manufacture at low tooling cost. Note that a square section is less suited to high-speed rotary service, where the larger contact area raises friction and heat.

Maintenance and OEM teams specify it across chemical processing, semiconductor equipment, and oil and gas.

Stocked as SV70470 and sold individually. Nominal inside diameter is listed as 21 inch. Review your operating media and conditions against this specification before installation.