-212 BLACK BUNA 70D O-RING

The H70MD212 is an AS568-212 black Buna-N (Nitrile) 70 Shore A O-Ring with an inside diameter of 0.859 in (21.82 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.137 in (28.88 mm). This o-ring compresses into its gland to block fluid or gas migration across a joint.

As a material, Buna-N (Nitrile) delivers low compression set under sustained load and an economical choice for high-volume maintenance programs. This material stands up to many alcohols, water, and hydraulic fluids. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with ketones or strong acids.

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

H70MD212 ships individually. Nominal inside diameter is listed as 7/8 inch. Confirm chemical compatibility, pressure and temperature against your own application requirements before installing. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.