568-142 FKM 75 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-142 black Viton® (FKM) 70 Shore A with an inside diameter of 2.362 in (59.99 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.568 in (65.23 mm), catalogued under part number SV70142. It seals with a broad flat contact band instead of the line contact of a round-section ring.

The compound resists many acids, petroleum oils and fuels, and aggressive chemicals. That behavior comes from the compound itself: Viton® (FKM) offers the industry benchmark where nitrile reaches its thermal limit and long service life in hot, chemically aggressive environments. Continuous operating temperature is published at -15°F (-26.1°C) to 400°F (204.4°C). Applications involving amines or ketones and esters call for a different compound. 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.

Maintenance and OEM teams specify it across automotive fuel systems, aerospace, and semiconductor equipment.

Stocked as SV70142 and sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation. For a size or compound outside the standard catalog, APG can quote from a print or sample.