568-242 BUNA 70 SQUARE CUT RINGS

This square-cut ring is supplied in AS568-242 black Buna-N (Nitrile) 70 Shore A measuring an inside diameter of 3.984 in (101.19 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.262 in (108.25 mm), catalogued under part number SH70242. It provides an economical lathe-cut alternative where a moulded o-ring is not required.

Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs and the most widely specified general-purpose sealing elastomer. This material stands up to propane and butane, many alcohols, and water. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ketones or automotive brake fluid are present. 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 construction equipment, fluid power, and general industrial maintenance.

SH70242 ships individually. Unit weight is approximately 4.6708 g. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing.