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This O-ring is made of black Buna-nitrile, is round in cross-section, has a durometer of 70A, and is designed for use in a wide variety of sealing applications.
Buna-nitrile can have high tensile strength, and abrasion, tear, and compression set resistance. It can be used in temperatures between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C), and is compatible for use with petroleum, HFA, HFB and HFC fluids, vegetable oil, alcohol, acids and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering and should therefore not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.
This Buna O-ring has a shore durometer of 70A. Shore durometer is the hardness of a material, and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100, with 100 indicating no indentation.
O-rings commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section, and a hole in the center, similar to a doughnut. O-rings are available in various sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.
These Buna-nitrile O-rings meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.
veritas
Reviewed in the United States on February 22, 2025
These O-rings are a perfect fit and a great hack to replace factory GM O-rings for transmission oil cooler line adapters to the radiator. The Buna-N material is resistant to oil & coolant damage. All at a great price too!
Erick S.
Reviewed in the United States on January 13, 2025
Perfect fit for Harley-Davidson Twin Cam oil drain plug.
fixitforgood
Reviewed in the United States on March 10, 2024
This is the exact size for my airhose reel that had leaking orings. No more air leaks!
Gorillaman's Garage
Reviewed in Canada on October 4, 2017
Find of the century for any Twin Cam Harley owner.
Gunz
Reviewed in the United States on July 15, 2016
Like other Harley owners have said, these are perfect replacement for the Harley Davidson 103 oil drain plugs. I used 3 of them yesterday when I changed the motor oil, gear oil, and transmission fluid on my 2014 Road King. HD charges $1.00/each. Finding this package of 100 for less than 3 bucks is awesome. More than I'll ever use, but I'll share them with Harley riding buddies.
Sandman
Reviewed in the United States on February 28, 2015
This product filled my needs very nicely, and the price was really good. I priced similar items at the local hardware store for 79 cents for two. These are less than 3 cents each. One reason I really like them is that I can lubricate them with generic vasoline instead of having to use high priced silicon grease. I use them in my model airplane pneumatic retract landing gear cylinders. My system now holds pressure for more than a week.
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