APG stocks the H50349, an AS568-349 black Buna-N (Nitrile) 50 Shore A O-Ring measuring an inside diameter of 4.475 in (113.67 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 4.895 in (124.33 mm). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.
Expect good resistance to many alcohols, propane and butane, and hydraulic fluids. That behavior comes from the compound itself: Buna-N (Nitrile) offers the most widely specified general-purpose sealing elastomer and an economical choice for high-volume maintenance programs. The material carries a published service range of -40°F (-40°C) to 250°F (121.1°C). It should not be specified for service in automotive brake fluid or ozone and direct sunlight.
Maintenance and OEM teams specify it across construction equipment, agricultural equipment, and automotive.
H50349 ships individually. Check the compound against your process media, pressure and temperature before committing to a design.
Description -349 BLACK BUNA 50D O-RING
Actual Cross Section 0.21 inch (5.33 mm)
Actual Inside Diameter 4.475 inch (113.67 mm)
Actual Outside Diameter 4.895 inch (124.33 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity