568-350 BUNA 70 SQUARE CUT RINGS

Ordered as SH70350, this is an AS568-350 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 4.6 in (116.84 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 5.02 in (127.51 mm). The square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

Expect good resistance to hydraulic fluids, greases and lubricants, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. Verify compatibility before use with strong acids or automotive brake fluid. 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.

You will find this material specified across agricultural equipment, general industrial maintenance, and fluid power.

Reference part number SH70350 when ordering; the item is sold individually. Unit weight is approximately 10.526 g and nominal inside diameter is listed as 4 5/8 inch. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.