Ordered as H50338, this is an AS568-338 black Buna-N (Nitrile) 50 Shore A O-Ring built to an inside diameter of 3.1 in (78.74 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.52 in (89.41 mm). The o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.
The material holds up against hydraulic fluids, many alcohols, and petroleum-based oils. Buna-N (Nitrile) is valued for the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. Published continuous service range is -40°F (-40°C) to 250°F (121.1°C). It is not the right choice where ketones or strong acids are present.
Maintenance and OEM teams specify it across fluid power, hydraulic and pneumatic systems, and general industrial maintenance.
This item is sold individually under part number H50338. Application requirements vary, so validate compatibility with your process conditions prior to installation.
Description -338 BLACK BUNA 50D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 3.1 inch (78.74 mm)
Actual Outside Diameter 3.52 inch (89.41 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity