-423 BLACK BUNA 70D O-RING

Part number H70MD423 is an AS568-423 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.225 in (107.32 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.775 in (121.29 mm). An o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.

Expect good resistance to propane and butane, water, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is known for reliable performance in both static and dynamic service, low compression set under sustained load. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where strong acids or polar solvents are present.

This o-ring is metal detectable for HACCP and foreign-body control programs. Typical settings include general industrial maintenance, fluid power, and hydraulic and pneumatic systems.

This item is sold individually under part number H70MD423. 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.