568-335 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-335 black Viton® (FKM) 70 Shore A with an inside diameter of 2.725 in (69.22 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.145 in (79.88 mm), catalogued under part number SV70335. It offers greater contact area against the gland wall than an equivalent o-ring.

The compound resists aromatic hydrocarbons, many acids, and chlorinated solvents. Viton® (FKM) is valued for 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 low-molecular-weight organic acids or ketones and esters are present. The profile itself contributes a rectangular section that will not roll in the groove and simple lathe-cut manufacture at low tooling cost. 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 chemical processing, aerospace, and semiconductor equipment.

Reference part number SV70335 when ordering; the item is sold individually. Nominal inside diameter is listed as 2 3/4 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.