568-425 FKM 75 SQUARE CUT RINGS

APG stocks the SV70425, an AS568-425 black Viton® (FKM) 70 Shore A Square-Cut Ring with an inside diameter of 4.475 in (113.67 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.025 in (127.64 mm). A square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

Viton® (FKM) is specified here for outstanding high-temperature capability and very low compression set at elevated temperature. The compound resists aromatic hydrocarbons, petroleum oils and fuels, and engine and transmission fluids. Published continuous service range is -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 simple lathe-cut manufacture at low tooling cost and a rectangular section that will not roll in the groove. 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 oil and gas, chemical processing, and semiconductor equipment.

This item is sold individually under part number SV70425. Nominal inside diameter is listed as 4 1/2 inch. Check the compound against your process media, pressure and temperature before committing to a design. For a size or compound outside the standard catalog, APG can quote from a print or sample.