568-281 BUNA 70 SQUARE CUT RINGS

Part number SH70281 is an AS568-281 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 14.984 in (380.59 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 15.262 in (387.65 mm). A square-cut ring provides an economical lathe-cut alternative where a moulded o-ring is not required.

This material stands up to hydraulic fluids, many alcohols, and propane and butane. That behavior comes from the compound itself: Buna-N (Nitrile) offers low compression set under sustained load and an economical choice for high-volume maintenance programs. Continuous operating temperature is published at -40°F (-40°C) to 250°F (121.1°C). The profile itself contributes greater resistance to extrusion than a round section of the same size 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 construction equipment, automotive, and fluid power.

Order part number SH70281, sold individually. Nominal inside diameter is listed as 15 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.