568-343 BUNA 70 SQUARE CUT RINGS

Part number SH70343 is an AS568-343 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring built to an inside diameter of 3.725 in (94.62 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.145 in (105.28 mm). A square-cut ring provides an economical lathe-cut alternative where a moulded o-ring is not required.

As a material, Buna-N (Nitrile) is valued for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. It resists petroleum-based oils, water, and greases and lubricants. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with automotive brake fluid or polar solvents. The profile itself contributes a rectangular section that will not roll in the groove 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.

Maintenance and OEM teams specify it across fluid power, agricultural equipment, and construction equipment.

Reference part number SH70343 when ordering; the item is sold individually. Unit weight is approximately 8.657 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.