The H50348 is an AS568-348 black Buna-N (Nitrile) 50 Shore A O-Ring built to an inside diameter of 4.35 in (110.49 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.77 in (121.16 mm). This o-ring provides a reliable static or dynamic seal by deforming into its gland under assembly load.
It resists petroleum-based oils, propane and butane, and hydraulic fluids. Buna-N (Nitrile) is known for low compression set under sustained load and the most widely specified general-purpose sealing elastomer. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). Verify compatibility before use with polar solvents or strong acids.
Maintenance and OEM teams specify it across construction equipment, agricultural equipment, and hydraulic and pneumatic systems.
This item is sold individually under part number H50348. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.
Description -348 BLACK BUNA 50D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 4.35 inch (110.49 mm)
Actual Outside Diameter 4.77 inch (121.16 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity