-406 BLACK BUNA 70D O-RING

APG stocks the H70MD406, an AS568-406 black Buna-N (Nitrile) 70 Shore A O-Ring built to an inside diameter of 2.1 in (53.34 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 2.65 in (67.31 mm). An o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.

The compound resists propane and butane, hydraulic fluids, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ozone and direct sunlight or strong acids are present.

This o-ring is metal detectable for HACCP and foreign-body control programs. Maintenance and OEM teams specify it across hydraulic and pneumatic systems, fluid power, and agricultural equipment.

Order part number H70MD406, sold individually. As always, verify media compatibility and operating conditions against the requirements of your specific application. Not finding the exact configuration you need? APG cross-references from prints, samples and competitor part numbers.