This o-ring is supplied in AS568-389 black Buna-N (Nitrile) 70 Shore A with an inside diameter of 19.953 in (506.81 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 20.373 in (517.47 mm), catalogued under part number H70MD389. It delivers dependable bidirectional sealing in a compact groove envelope.
Buna-N (Nitrile) is specified here for most widely specified general-purpose sealing elastomer and low compression set under sustained load. It resists greases and lubricants, many alcohols, and petroleum-based oils. 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 ketones or automotive brake fluid.
The compound is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include hydraulic and pneumatic systems, construction equipment, and automotive.
H70MD389 ships individually. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description -389 BLACK BUNA 70D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 19.953 inch (506.81 mm)
Actual Outside Diameter 20.373 inch (517.47 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable