568-369 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-369 black Viton® (FKM) 70 Shore A measuring an inside diameter of 7.975 in (202.57 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 8.395 in (213.23 mm), catalogued under part number SV70369. It seals with a broad flat contact band instead of the line contact of a round-section ring.

The compound resists aromatic hydrocarbons, engine and transmission fluids, and petroleum oils and fuels. That behavior comes from the compound itself: Viton® (FKM) delivers very low compression set at elevated temperature and long service life in hot, chemically aggressive environments. The material carries a published service range of -15°F (-26.1°C) to 400°F (204.4°C). Exposure to ketones and esters or amines will shorten service life. The profile itself contributes greater resistance to extrusion than a round section of the same size 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.

Reference part number SV70369 when ordering; the item is sold individually. Nominal inside diameter is listed as 8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.