The H50243 is an AS568-243 black Buna-N (Nitrile) 50 Shore A O-Ring with an inside diameter of 4.109 in (104.37 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.387 in (111.43 mm). This o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
The material holds up against water, greases and lubricants, and hydraulic fluids. Buna-N (Nitrile) is specified for reliable performance in both static and dynamic service, the most widely specified general-purpose sealing elastomer. Service temperature is rated from -40°F (-40°C) through 250°F (121.1°C). It is not the right choice where automotive brake fluid or ozone and direct sunlight are present.
Maintenance and OEM teams specify it across agricultural equipment, general industrial maintenance, and hydraulic and pneumatic systems.
Order part number H50243, sold individually. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description -243 BLACK BUNA 50D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 4.109 inch (104.37 mm)
Actual Outside Diameter 4.387 inch (111.43 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity