568-203 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-203 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 0.296 in (7.52 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 0.574 in (14.58 mm), catalogued under part number SH70203. It seals with a broad flat contact band instead of the line contact of a round-section ring.

Buna-N (Nitrile) is specified here for reliable performance in both static and dynamic service, economical choice for high-volume maintenance programs. The compound resists propane and butane, hydraulic fluids, and petroleum-based oils. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). Applications involving ketones or polar solvents call for a different compound. The profile itself contributes simple lathe-cut manufacture at low tooling cost 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.

Common environments for this compound include general industrial maintenance, construction equipment, and automotive.

SH70203 ships individually. Check the compound against your process media, pressure and temperature before committing to a design.