The H70MD419 is an AS568-419 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 3.725 in (94.62 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 4.275 in (108.59 mm). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.
Buna-N (Nitrile) is specified here for strong abrasion and tear resistance, most widely specified general-purpose sealing elastomer. This material stands up to petroleum-based oils, propane and butane, and many alcohols. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with ozone and direct sunlight or ketones.
This o-ring is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across general industrial maintenance, construction equipment, and hydraulic and pneumatic systems.
This item is sold individually under part number H70MD419. Nominal inside diameter is listed as 3 3/4 inch. Review your operating media and conditions against this specification before installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description -419 BLACK BUNA 70D O-RING
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 3.725 inch (94.62 mm)
Actual Outside Diameter 4.275 inch (108.59 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable