The H50212 is an AS568-212 black Buna-N (Nitrile) 50 Shore A O-Ring built to 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 creates a positive seal at flange, piston and rod interfaces without added hardware.
As a material, Buna-N (Nitrile) is known for the most widely specified general-purpose sealing elastomer and low compression set under sustained load. The material holds up against many alcohols, propane and butane, and hydraulic fluids. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Exposure to strong acids or automotive brake fluid will shorten service life.
Maintenance and OEM teams specify it across construction equipment, automotive, and agricultural equipment.
H50212 ships individually. Nominal inside diameter is listed as 7/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description -212 BLACK BUNA 50D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 0.859 inch (21.82 mm)
Actual Outside Diameter 1.137 inch (28.88 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity