Ordered as H70MD418, this is an AS568-418 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 3.6 in (91.44 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.15 in (105.41 mm). The o-ring delivers dependable bidirectional sealing in a compact groove envelope.
Buna-N (Nitrile) is known for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. It resists propane and butane, hydraulic fluids, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Exposure to ketones or polar solvents will shorten service life.
This item is metal detectable for HACCP and foreign-body control programs. You will find this material specified across construction equipment, general industrial maintenance, and hydraulic and pneumatic systems.
Order part number H70MD418, sold individually. Check the compound against your process media, pressure and temperature before committing to a design. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.
Description -418 BLACK BUNA 70D O-RING
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 3.6 inch (91.44 mm)
Actual Outside Diameter 4.15 inch (105.41 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable