-353 BLACK FKM 70D SQUARE RING

Ordered as SV70353, this is an AS568-353 black Viton® (FKM) 70 Shore A Square-Cut Ring supplied with an inside diameter of 4.975 in (126.37 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.395 in (137.03 mm). The square-cut ring seals with a broad flat contact band instead of the line contact of a round-section ring.

Expect good resistance to petroleum oils and fuels, chlorinated solvents, and engine and transmission fluids. Viton® (FKM) is widely chosen for outstanding high-temperature capability and the industry benchmark where nitrile reaches its thermal limit. Service temperature is rated from -15°F (-26.1°C) through 400°F (204.4°C). Verify compatibility before use with amines or low-molecular-weight organic acids. The profile itself contributes a rectangular section that will not roll in the groove 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.

Typical settings include automotive fuel systems, chemical processing, and oil and gas.

Order part number SV70353, sold individually. Nominal inside diameter is listed as 5 inch. Review your operating media and conditions against this specification before installation.