568-428 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-428 black Viton® (FKM) 70 Shore A supplied with an inside diameter of 4.85 in (123.19 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.4 in (137.16 mm), catalogued under part number SV70428. It provides an economical lathe-cut alternative where a moulded o-ring is not required.

It resists many acids, chlorinated solvents, and petroleum oils and fuels. Viton® (FKM) offers the industry benchmark where nitrile reaches its thermal limit and outstanding high-temperature capability. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C). It is not the right choice where ketones and esters or hot water and steam are present. The profile itself contributes a flat contact band that spreads sealing load across a wider area and greater resistance to extrusion than a round section of the same size. 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 high-temperature process equipment, semiconductor equipment, and aerospace.

This item is sold individually under part number SV70428. As always, verify media compatibility and operating conditions against the requirements of your specific application. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.