The H70MD348 is an AS568-348 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 4.35 in (110.49 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.77 in (121.16 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.
The compound resists propane and butane, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is widely chosen for low compression set under sustained load, reliable performance in both static and dynamic service. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ketones or ozone and direct sunlight.
This o-ring is metal detectable for HACCP and foreign-body control programs. Typical settings include construction equipment, general industrial maintenance, and hydraulic and pneumatic systems.
This item is sold individually under part number H70MD348. Nominal inside diameter is listed as 4 3/8 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description -348 BLACK BUNA 70D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 4.35 inch (110.49 mm)
Actual Outside Diameter 4.77 inch (121.16 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable