The H50431 is an AS568-431 black Buna-N (Nitrile) 50 Shore A O-Ring with an inside diameter of 5.225 in (132.72 mm), a cross section of 0.275 in (6.99 mm), and an outside diameter of 5.775 in (146.69 mm). This o-ring creates a positive seal at flange, piston and rod interfaces without added hardware.
It resists water, many alcohols, and greases and lubricants. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer, strong abrasion and tear resistance. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). Verify compatibility before use with polar solvents or ozone and direct sunlight.
Maintenance and OEM teams specify it across agricultural equipment, hydraulic and pneumatic systems, and automotive.
H50431 ships individually. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description -431 BLACK BUNA 50D O-RING
Actual Cross Section 0.275 inch (6.99 mm)
Actual Inside Diameter 5.225 inch (132.72 mm)
Actual Outside Diameter 5.775 inch (146.69 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity