The H70MD438 is an AS568-438 black Buna-N (Nitrile) 70 Shore A O-Ring measuring an inside diameter of 6.225 in (158.12 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 6.775 in (172.09 mm). This o-ring delivers dependable bidirectional sealing in a compact groove envelope.
As a material, Buna-N (Nitrile) delivers reliable performance in both static and dynamic service, an economical choice for high-volume maintenance programs. This material stands up to propane and butane, greases and lubricants, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C).
The compound is metal detectable for HACCP and foreign-body control programs. Common environments for this compound include construction equipment, agricultural equipment, and hydraulic and pneumatic systems.
Order part number H70MD438, sold individually. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.
Description -438 BLACK BUNA 70D O-RING
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 6.225 inch (158.12 mm)
Actual Outside Diameter 6.775 inch (172.09 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable