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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.
Milorad
Reviewed in the United States on February 25, 2025
Purchased bag of 100 O-rings. Easy transaction fast shipping. Good fit. Not sure about durability. Will post another review after while to update on durability.
Ned
Reviewed in Canada on August 22, 2024
I've been using the 208 Buna-N O-ring for a few weeks now, and I'm very impressed with its quality and performance. It's exactly the size and durometer I needed for my project, and it's been providing a tight and reliable seal.The material is durable and resistant to various chemicals, making it ideal for my application. The o-ring has held up well under pressure and hasn't shown any signs of wear or tear. I'm confident that it will continue to perform well for a long time.If you're looking for a high-quality o-ring that you can trust, I highly recommend the 208 Buna-N O-ring. It's a great value for the price, and I'm sure you'll be satisfied with your purchase.
Mel
Reviewed in the United States on March 8, 2024
Just as described and arrived quickly!
CptOrion
Reviewed in the United States on March 25, 2024
I need a number of these O-rings, and buying in bulk is the best way to go. These should work great.
Gerard Luttmer
Reviewed in Canada on May 7, 2023
Great o ring and good quality product
Tyler Norling
Reviewed in the United States on May 17, 2023
These worked but are slightly thinner than what I have used in the past for supposedly the exact model part. With that being said not sure they will last as long.
logan
Reviewed in the United States on October 19, 2023
I use there as replacement retaining rings on pins and feathers for masonry. They hold up well and have good elasticity. I don't use them as a seal for anything, but as far as staying elastic and bouncing back after being hammered on, they met my expectations.
Doc Orion
Reviewed in Canada on May 17, 2022
I got these for my Liberty garden hose cart which needs a thicker O ring and they fit perfectly and no more leaking
W Y MO
Reviewed in the United States on November 23, 2022
Thank you for including the measurements! It fits my old Harbor Freight floor jack's pump piston seal. The correct size is not exactly easy to find, but this one was the closest. Installed it and the leak is gone. Seems to be holding up to the hydraulic fluid.
Ontario1
Reviewed in Canada on May 23, 2021
Needed an O-ring for my hose reel. After searching locally with no luck in finding one this size (Size - 208), I purchased 100 on Amazon. Works just fine. I will be keeping some for future use and with the rest, I made up little gift baggies of O-Rings for friends and family.
Phil T.
Reviewed in Canada on December 10, 2020
Used this to replaced a damaged Oring in my floor jack. Seems to be working great as it no longer leaks. Good quality and shipped fast.
Luis
Reviewed in the United States on April 16, 2020
Purchased to replace damaged Oring in 3 ton jack. Worked out great...🤔 not sure what to do with the 99 other ones. My recommendation to seller is to make packs of 10, 30, 50, and 100. So buyers can buy less if they dont need so many. Seems like a waist.
Ed from Reading, PA
Reviewed in the United States on August 1, 2019
Size is correct
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