-159 BLACK BUNA 70D O-RING

H70MD159 is an AS568-159 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.987 in (126.67 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 5.193 in (131.9 mm). In service, this o-ring delivers dependable bidirectional sealing in a compact groove envelope.

Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, low compression set under sustained load. It resists petroleum-based oils, many alcohols, and hydraulic fluids. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or automotive brake fluid are present.

This o-ring is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and automotive.

Reference part number H70MD159 when ordering; the item is sold individually. Nominal inside diameter is listed as 5 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.