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008 Buna-N O-Ring, 70A Durometer, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 100)

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4.5 165 ratings

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$12.99 $0.13 per Count

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Material	Nitrile Rubber
Nominal Inside Diameter	0.18 Inches
Item Diameter	0.32 Inches
Brand	Mr O-Ring
Color	Black

About this item

Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids and hydrocarbons
Can be used across a wide temperature range from -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C)
Round in cross-section to provide a seal between cylindrical overlapping surfaces
Durometer (hardness) of 70A for resistance to penetration
Meets standards defined by Aerospace Standard AS568A

Additional Details

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008 Buna-N O-Ring, 70A Durometer, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 100)

$12.99 ($0.13/Count)

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001 Buna-N O-Ring, 90A Durometer, Round, Black, 1/32" ID, 3/32" OD, 1/32" Width (Pack of 100)

$9.57 ($0.10/Count)

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004 Neoprene O-Ring, 70A Durometer, Round, Black, 5/64" ID, 13/64" OD, 1/16" Width (Pack of 100)

$6.86 ($0.07/Count)

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Product details

Package Dimensions ‏ : ‎ 6 x 4.5 x 0.1 inches; 0.32 Ounces
Item model number ‏ : ‎ 008
Date First Available ‏ : ‎ May 26, 2017
Manufacturer ‏ : ‎ Small Parts
ASIN ‏ : ‎ B000FMWLR8

Best Sellers Rank: #281,269 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
- #1,122 in O-Rings

Customer Reviews:
4.5 165 ratings

Product Description

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.

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Customer reviews

4.5 out of 5

165 global ratings

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Kellin Q

Cheap and effective

Reviewed in the United States on April 26, 2017

Verified Purchase

Significantly reduced keying the noise of my Azio MGK1 keyboard with knock-off brown switches. It's still audible, but it was reduced down to the point where I highly doubt it could be heard from the next room over like before and the tactile feedback is still there as well. The 70A hardness seems to be just hard enough to not feel squishy and I find it easier to type faster with less bottoming (total) key travel. There were nearly enough O-rings to put one under ever key on my standard layout keyboard, but I was two short and left out the scroll lock and pause break key so it really isn't that big of a deal being two short. The shipping from Jet Gasket & Seal Co was also extremely fast and arrived at the same time as my Prime 2-day order did even though this item didn't have Prime shipping.

Here's a tip to install these easier that I found out a little over half-way through installing them: Push the O-ring on, let it pop off (because it will), and then push it right back on and it'll stay. At first, I thought it was only one side that installed easier, but after doing so many I realized that they just needed to be stretched a little bit and then they'll pop right on the second time no problem. Don't worry about getting the O-ring to the bottom of the key, just get it on the stem. You can press bottom-out the key a few times after installing it to get the O-ring fully fitted.

Overall, I'd completely recommend, especially for the price (I paid less than $5).

3 people found this helpful

Helpful

These work well for quieting mechanical keyboards

Reviewed in the United States on May 8, 2014

Verified Purchase

I wrote a longer review on how well these black O-Rings work for quieting mechanical keyboards by buffering the plastic to plastic contact when you bottom out the keys. Basically any rubber O-Ring will prevent the CLACK sound when the keys bottom out from using too much force on them. So compared to no O-Rings, you will notice the difference and it is more pleasant when typing when you don't hear the clack sound but can still hear the nice click some mechanical keyboards make.
It depends on the type of switch you have whether or not you still hear the click, what adding these under the keys will do is dampen the noise made by the keys bottoming out. So it will virtually eliminate the clack but not the click if you say have Cherry MX Blues on your mechanical keyboard.
It is a nice modification to make in my opinion and these are the cheapest in price I've seen yet for this purpose.
I highly recommend them for mechanical keyboard mods!

There are other softer (50A) O-Rings also sold here on Amazon for not too much money which I've also purchased and used but honestly I could hear or feel any difference between the two. Big difference between no O-Ring and installing an O-Ring but it was very hard for me to differentiate between these really inexpensive 70A and the softer 50A.

So if you want to try the mechanical keyboard Mod and not pay too much for the O-Rings then i highly recommend these for you.
Good luck with your Mod!

23 people found this helpful

Helpful

Maha Z.

Reduces noise, key travel, retains a solid bottoming out feel.

Reviewed in the United States on November 7, 2016

Verified Purchase

I gave this five stars even though i'm not going to use them. I originally got them for a cherry mx red board. I wanted to shorten the bottoming out distance without affecting the hardness of bottoming out. all other O rings I've tried felt mushy and rubbery, these feel satisfying to bottom out. I'm not using them because I switched to the cherry mx speed in the k70 rapidfire. This keyboard already has a shortened travel from the standard mx switch so I don't need the o ring anymore. I don't care much to silence the bottoming out, but if you do, know that these greatly reduce the clack from bottoming out. overall, these are great and much less expensive than what other companies are charging, you only get 100 o rings in a pack so it won't be enough to cover every single key. I would do the alpha keys and the num pad. o need for F keys and the home/end cluster. I'm going to keep them in case I ever get another board without mx speed switches.

Helpful

JustAnotherShopper

Glad I bought these

Reviewed in the United States on January 11, 2017

Verified Purchase

Just got these yesterday and put them in my non-rgb Corsair Strafe this morning. It took some time, but it was definitely worth the effort. The keys have a nice, softer, quieter feel when I type and the clacking sound from bottoming out is greatly reduced, all without affecting my typing at all. I only wish these rings came in packs of 110 or 125 to accomodate for full size keyboards, but the few keys I didn't put them on aren't really used much anyway.

Buyer beware: These also partially block out the backlighting on middle of the keycaps that the symbol(s) or part of the symbol(s) is printed in the middle of. These ARE opaque black o-rings, you know.

If that doesn't bother you much, though, definitely get these ones if you're looking for some good o-rings at a low price!

One person found this helpful

Helpful

Perfect for Cherry MX-Blue, Brown, and Red switches.

Reviewed in the United States on February 8, 2015

Verified Purchase

Perfect for the Corsair K70 Cherry MX-Blue, Red, and Brown keyboard switches. Don't spend more money for colored O-rings that you can't see when installed. These fit perfectly and remove the clack sound after the click on MX-Blues and the clack on the non-clicking switches. Don't try to pack them tightly to the end of each key and just get them touching the bottom to avoid damage to the thin vertical fins that will hold the O-ring in place. A single O-ring hardly reduces travel distance and you could put 2 under a single key for the MX-Blue switches. If you put two under the MX-Blue switches then you can noticeably reduce the distance to the bottom. Your fingers notice the force required to type a stroke when the distance is shortened and everyone in my household preferred a single washer instead of two. But some gamers may prefer the super short distances of using two for each key with the MX-Blues, but there is a psychological effect that makes you believe the keys get harder to press each time you reduce the distance.

5 people found this helpful

Helpful

Top reviews from other countries

Rob

Easy to apply and does not affect how it's pressed ...

Reviewed in Canada on July 15, 2018

Verified Purchase

Used this with Coolermaster keyboard with Brown Switches and had a noticeable difference in reducing the sound, especially when bottoming out. I use voice activity on Discord and my mic no longer picks up my keyboard anymore. Easy to apply and does not affect how it's pressed by that much.

apple pie

Used for keyboard

Reviewed in Canada on February 16, 2017

Verified Purchase

Great for reducing the "bottom out" sound on especially loud keyboards. Blues are still very audible but a lot less annoying now.

Neal

Five Stars

Reviewed in Canada on February 1, 2017

Verified Purchase

MY MOMS DOESNT YELL AT ME NO MORE NOW THAT MY KEYSTROKES ARE SILENT

Mike

The answer to your problems

Reviewed in Canada on August 9, 2016

Verified Purchase

Really helped to quiet down the keys on my Razer keyboard.

Easy Pete

Five Stars

Reviewed in Canada on January 8, 2017

Verified Purchase

Fits mx-compatible switches and noticeably muffles bottoming out.

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008 Buna-N O-Ring, 70A Durometer, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 100)

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