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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.
Lee
2025-08-29 16:08:38
I'm using these as a drive belt for a small stone tumbler. They have held up well.
Ron G
2025-07-29 17:37:24
Description provided all the necessary dimensions and material to ensure a perfect fit.
Alessandro M. Nardinelli
2025-07-07 17:14:12
Resistant at high temperatures and pressure with a duration of 3 seconds. Very nice and reliable product. Strong and elastic at the same time.
William A Peiffer
2025-07-04 12:49:38
Worked great and stopped leak.
Curtis E. Weldon
2025-07-03 10:46:13
The product worked great and saved money compared buying from the dealer of the device it was used in.I expected only one and got a pack for less than two dollars. Since this is a replacable part I will be able to use the extras in the future.
Afron
2025-06-10 12:28:14
Not as thick as expected. Forgot to read size
OMlet
2025-05-10 18:26:10
Perfect to replace the drive belt on my Bell&Howell MS10 movie projector. Certainly much more economical than buying belts being advertised for this projector, which are essentially the same thing but called a "belt" instead of an "O-Ring" and costing considerably more.
Matthew Abrams
2025-02-27 17:27:02
Strong rings, no problem. Used them as tires for battery-powered cars
ERIC
2025-01-06 15:28:55
The dimensions were fine, just gave 4 stars as the pictures make it seem much thicker than it really is. It ended up being flimsier than what I needed it for.
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