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This metric O-ring is made of black Viton and has a durometer of 75A, a round cross-section, and can be used across a wide temperature range (-15 degrees F/-26 degrees C to 400 degrees F/205 degrees C). Designed for use in a wide variety of sealing applications, this Viton O-ring meets standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.
Viton (fluorocarbon elastomer) has heat, fuel, and chemical resistance and is compatible for use with non-flammable hydraulic fuels, silicone oil, chlorinated hydrocarbons (trichlorethylene), aromatic hydrocarbons (benzene) and aliphatic hydrocarbons (propane). It works well in high vacuum environments and is vulnerable to low molecular organic acids, ammonia gas, alkalis, amines, glycol-based brake fluids, and super-heated steam.
The durometer hardness of this Viton O-ring is 75A. Durometers measure 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, a value of 0 indicates that a sample was completely penetrated, while a value of 100 shows no indentation in the sample. The letter following the number identifies the shore scale, which is either shore A or D. Shore A is used for softer plastics, while shore D is used for harder plastics.
O-rings 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 AS568A dash sizes, which is the standardized sizing for O-rings, and defines the nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter of an O-ring.
Jacob Bjork
Reviewed in the United States on February 15, 2025
Excellent quality and value.
T. Danger
Reviewed in the United States on July 9, 2024
Perfect fitment for takedown lever on Sig Sauer P320. Mine was all crusty and half of it was gone so I would replace it every 1k round.
Tom Russell
Reviewed in the United States on April 8, 2024
Works perfectly for the piston in the shotgun
Alexis D
Reviewed in Canada on April 27, 2022
Ordered a 25 pack but when I received this, there were only 10 o-rings in an opened zip-lock bag.
ryan
Reviewed in the United States on January 2, 2020
Shipped fast, fare price, perfect fit. Can't determine durability until I use with live fire. Purchased for 9mm threaded barrels..
Steven A.
Reviewed in Canada on September 8, 2019
These fit the brass jets on the stupid design carburetor jets on Briggs and Stratton lawn tractor engines that like to fall out of place and land in the carb bowl. Cheaper and better fix that new jets from dealer
B.Park
Reviewed in Canada on January 15, 2019
used for breech seal in my air rifle
Jonathan Tessier
Reviewed in Canada on April 5, 2018
perfect fit for what i needed !
Michael Faris
Reviewed in the United States on September 15, 2017
Used these on the radiator hoses of my 325i. They worked great at the thermostat connection. When it came to the lower radiator hose to radiator connection and the upper radiator hose to expansion tank connection, I just could not get them to go on. I had to reuse the better of the 4 removed orings on those two connections. For whatever reason, at the thermostat they went right on, snug fit, no leaks. It was still cheaper than buying two new hoses that were in good condition.
gello
Reviewed in Canada on December 24, 2017
very good
CPS
Reviewed in the United States on July 18, 2016
I have a pressure washer hose reel from Northern Tools (General Pump brand), and the swivel on the side blew one o-ring (there are 2 o-rings total in the swivel and they are the same size, this one from Amazon). I looked everywhere for a General Pump swivel rebuild kit (which they do make), and everyone said they were on a 3 month back order. So after some measurements I found that this Amazon o-ring was a perfect match. Install 2 new Viton o-rings, put a little silicone grease on the o-rings, and the swivel works like new with no leaks. Plus, I have some extras now just in case it happens again!I do recommend these Viton o-rings,CPS
Jeff C.
Reviewed in the United States on December 8, 2014
Not finding the exact replacement O-Rings for the Harbor Freight Hose Reel, this 2.5mm (thick) by 11mm (ID), totaling 16mm was the closest to meeting the OEM specification of 2.4mm (thick) by 11.2mm (ID). The difference between these is, the Viton ring has a .2mm smaller ID, but the actual ring thickness makes up for that. In the end, there is a slightly tighter seal perhaps due to a little stretching of the smaller 11mm ID and then the slight increase in thickness. The terminal Outer Diameter increase in the end (over the original) may be only as much as 1mm in the end. At least in this usage case, the difference is a tighter seal! And these worked VERY well for replacements.It may be the nature of DuPont’s Viton that these O-Rings do not offer much stretch at all. The old (perhaps standard rubber) O-Rings were very easy to remove from their seats and stretched easily over the wider shaft to remove them.While applying the replacements using the Viton O-Ring, the first attempt failed and the O-Ring split while trying to stretch it over the shaft. Being a harder material than the original O-Ring, I may have played a role in the failure by using the wrong tool to slide the ring with (having to use a prying force). There was no such failure using this tool while removing the old rings.Comparing the old rings and new rings, there is a definite difference in elasticity. Perhaps this is why the old ones failed.Here is a tip: if you do use these O-Rings to repair your HF Hose Reel, clean up the old seats and apply a little brake grease on them. Slide the first ring (the outer ring) on and let it slip into its seat. This will allow the inner ring to slide past (over) the first ring.The fix to the hose reel was so fast and simple, I should have done it years ago!
TheOG
Reviewed in the United States on March 14, 2013
I looked for this O-ring specifically to fix a leak in the power steering fluid reservoir of my BMW. BMW apparently has chosen a low-grade O-ring for this application and this is a common leak problem that results in dried oil crusting around the reservoir. BMW uses ATF for power steering and so I did some research to see if there would be a better choice material for this application and was pretty much recommended by everyone and everything i read to use Viton. This O-ring is a perfect fit for the power steering cap (that says "ATF only" on it) and my leak has stopped now. I've only had it for a few months so it's hard to say at this point how well the O-ring is performing. The factory O-ring usually starts to show signs of leakage after a couple of years. I'll report back after a few years, but this option is much cheaper than buying the factory power steering cap (in order to get a new O-ring) and I can now recommend it to other BMW owners as well.UPDATE for 2015: it's been over 2 yrs since installing this O-ring and the leak has not returned on my car. I've also installed this on several other people's BMWs with the same problem and none of them have come back with the leak. This looks to be a good solution to the P/S cap leak.
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