The H50145 is an AS568-145 black Buna-N (Nitrile) 50 Shore A O-Ring with an inside diameter of 2.55 in (64.77 mm), a cross section of 0.103 in (2.62 mm), and an outside diameter of 2.756 in (70 mm). This o-ring remains the most cost-effective sealing element available for pressurized assemblies.
The material holds up against greases and lubricants, many alcohols, and hydraulic fluids. Buna-N (Nitrile) is valued for strong abrasion and tear resistance, reliable performance in both static and dynamic service. 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 ketones are present.
Maintenance and OEM teams specify it across general industrial maintenance, construction equipment, and hydraulic and pneumatic systems.
Stocked as H50145 and sold individually. Check the compound against your process media, pressure and temperature before committing to a design. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.
Description -145 BLACK BUNA 50D O-RING
Actual Cross Section 0.103 inch (2.62 mm)
Actual Inside Diameter 2.55 inch (64.77 mm)
Actual Outside Diameter 2.756 inch (70 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity