5.7MM CS X 71.2MM ID BLACK BUNA 70D

Ordered as H5.7X71.2, this is a black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 71.2 mm (2.803 in), a cross section of 5.7 mm (0.224 in), and an outside diameter of 82.6 mm (3.25 in). The o-ring compresses into its gland to block fluid or gas migration across a joint.

It resists hydraulic fluids, water, and many alcohols. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and low compression set under sustained load. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It should not be specified for service in strong acids or polar solvents.

Typical settings include general industrial maintenance, hydraulic and pneumatic systems, and agricultural equipment.

Order part number H5.7X71.2, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.