Part number H50258 is an AS568-258 black Buna-N (Nitrile) 50 Shore A O-Ring with an inside diameter of 5.984 in (151.99 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 6.262 in (159.05 mm). An o-ring compresses into its gland to block fluid or gas migration across a joint.
As a material, Buna-N (Nitrile) offers an economical choice for high-volume maintenance programs, strong abrasion and tear resistance. Expect good resistance to petroleum-based oils, propane and butane, and greases and lubricants. Rated temperature range runs from -40°F (-40°C) to 250°F (121.1°C) in continuous service. It is not the right choice where automotive brake fluid or ozone and direct sunlight are present.
Maintenance and OEM teams specify it across general industrial maintenance, construction equipment, and fluid power.
Stocked as H50258 and sold individually. Nominal inside diameter is listed as 6 inch. Review your operating media and conditions against this specification before installation.
Description -258 BLACK BUNA 50D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 5.984 inch (151.99 mm)
Actual Outside Diameter 6.262 inch (159.05 mm)
Measurement System Imperial
Product Category O-Rings - Bulk - Commodity