568-156 BUNA 70 SQUARE CUT RINGS

Ordered as SH70156, this is an AS568-156 black Buna-N (Nitrile) 70 Shore A Square-Cut Ring with an inside diameter of 4.237 in (107.62 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 4.443 in (112.85 mm). The square-cut ring presents a flat rectangular section that cannot roll or twist in its groove, making it a dependable static seal.

Buna-N (Nitrile) is known for an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. The compound resists hydraulic fluids, water, and many alcohols. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Exposure to polar solvents or ozone and direct sunlight will shorten service life. The profile itself contributes simple lathe-cut manufacture at low tooling cost and greater resistance to extrusion than a round section of the same size. 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 automotive, hydraulic and pneumatic systems, and agricultural equipment.

Reference part number SH70156 when ordering; the item is sold individually. Unit weight is approximately 2.1349 g. Application requirements vary, so validate compatibility with your process conditions prior to installation.