This o-ring is supplied in AS568-278 black Buna-N (Nitrile) 70 Shore A supplied with an inside diameter of 11.984 in (304.39 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 12.262 in (311.45 mm), catalogued under part number H70MD278. It seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
Buna-N (Nitrile) offers strong abrasion and tear resistance, the most widely specified general-purpose sealing elastomer. This material stands up to hydraulic fluids, petroleum-based oils, and water. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).
This item is metal detectable for HACCP and foreign-body control programs. Typical settings include general industrial maintenance, fluid power, and automotive.
Order part number H70MD278, sold individually. Check the compound against your process media, pressure and temperature before committing to a design. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Description -278 BLACK BUNA 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 11.984 inch (304.39 mm)
Actual Outside Diameter 12.262 inch (311.45 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable