568-357 FKM 75 SQUARE CUT RINGS

Part number SV70357 is an AS568-357 black Viton® (FKM) 70 Shore A Square-Cut Ring with an inside diameter of 5.475 in (139.07 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.895 in (149.73 mm). A square-cut ring presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

The compound resists aggressive chemicals, chlorinated solvents, and engine and transmission fluids. That behavior comes from the compound itself: Viton® (FKM) offers excellent resistance to compression set and permeation, very low compression set at elevated temperature. Published continuous service range is -15°F (-26.1°C) to 400°F (204.4°C). Exposure to ketones and esters or hot water and steam will shorten service life. 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.

Common environments for this compound include high-temperature process equipment, chemical processing, and automotive fuel systems.

This item is sold individually under part number SV70357. Nominal inside diameter is listed as 5 1/2 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.