568-118 BUNA 70 SQUARE CUT RINGS

Part number SH70118 is an AS568-118 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring measuring an inside diameter of 0.862 in (21.89 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 1.068 in (27.13 mm). A square-cut ring presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

It resists propane and butane, water, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) delivers low compression set under sustained load, strong abrasion and tear resistance. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Applications involving polar solvents or ozone and direct sunlight call for a different compound. The profile itself contributes a rectangular section that will not roll in the groove and simple lathe-cut manufacture at low tooling cost. 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 general industrial maintenance, hydraulic and pneumatic systems, and automotive.

SH70118 ships individually. Unit weight is approximately 0.6023 g and nominal inside diameter is listed as 7/8 inch. Review your operating media and conditions against this specification before installation.