568-311 BUNA 70 SQUARE CUT RINGS

APG stocks the SH70311, an AS568-311 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring supplied with an inside diameter of 0.537 in (13.64 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 0.957 in (24.31 mm). A square-cut ring offers greater contact area against the gland wall than an equivalent o-ring.

Buna-N (Nitrile) is valued for strong abrasion and tear resistance, an economical choice for high-volume maintenance programs. This material stands up to hydraulic fluids, many alcohols, and water. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). 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.

It sees regular use in construction equipment, automotive, and hydraulic and pneumatic systems.

SH70311 ships individually. Nominal inside diameter is listed as 9/16 inch. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.