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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.
Mike
2025-08-28 10:17:20
i used this as a spacer for my speedometer and worked well good fit
PMP
2025-04-15 18:05:11
As described
Gonzales
2025-03-04 15:25:31
Great value for the money!
Nancy VanDruff
2025-01-11 18:39:59
Used for swimming pool piping connector. Didn’t fit real well. Larger diameter than expected. But with a bit a finagling it works and doesn’t leak.
Synthetic
2024-12-19 15:50:01
As advertised. Met my Needs!
vl
2024-12-17 18:28:40
Excellent product and service.
AjayA
2024-12-04 16:33:43
I used these large O rings to replace the original O ring on the humidifier where one fills the water. Just measured the opening diameter and bought an O ring a little bit smaller. Perfect replacement!
Leslie
2024-11-25 19:49:12
I needed to replace a ring for my jewelry tumbler. The first one broke, but the second one worked great. I didn't install the ring so i dont know if there was something left to damage the first one but the second one worked great.
nickjtc
2024-11-13 17:18:13
The description is correct in that the o-rings are 1/8" thick. However the image in the listing shows them as being much thicker
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