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  • 008 Buna-N O-Ring, 50A Durometer, Round, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 125)
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008 Buna-N O-Ring, 50A Durometer, Round, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 125)

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Price: $9.17 & FREE Shipping on orders over $35. Details
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Product Specifications
Part Number 008-7450
Actual ID 0.176  inches
Inside Diameter Tolerance 0.005  inches
Actual OD 0.316  inches
Actual Width 0.07  inches
Width Tolerance 0.003  inches
Nominal ID 3/16  inches
Nominal OD 5/16  inches
Nominal Width 1/16  inches
Dash Size 008
Pkg Qty 125
Specification for this product family (See all  products)
Brand Name Small Parts
Material Type Nitrile Rubber
Hardness 50 A Durometer
System of Measurement Inch
Color Name Black
Cross Section Shape Round
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Specification Met AS568A
UNSPSC Code 31410000


Product Features

  • Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids from petroleum to aliphatic hydrocarbons
  • Durometer (hardness) of 50A for resistance to penetration
  • Round cross-section to provide a seal between cylindrical overlapping surfaces
  • For use across a wide temperature range from -30 degrees F/-34 degrees C to 250 degrees F/121 degrees C
  • Meets standards defined by Aerospace Standard AS568A

Product Details

  • Shipping Weight: 0.8 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0051XWXCE
  • Item model number: 008
  • Average Customer Review: 4.9 out of 5 stars  See all reviews (90 customer reviews)
  • Amazon Best Sellers Rank: #3,988 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
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Frequently Bought Together

008 Buna-N O-Ring, 50A Durometer, Round, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 125) + 008 Buna-N O-Ring, 70A Durometer, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 100)
Price for both: $11.25

Buy the selected items together

Product Description

This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of 50A. It has a round cross-section and can be used across a wide temperature range (-30 degrees F/-34 degrees C to 250 degrees F/121 degrees C). Designed for use in a wide variety of sealing applications, this Buna-nitrile O-ring meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.

Buna-nitrile can have high tensile strength, as well as abrasion, tear, and compression set resistance. It is compatible for use with petroleum, hexafluoroacetone (HFA), hexafluoro-2-butyne (HFB) and hydrofluorocarbon (HFC) fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering, and should not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.

The durometer hardness of this Buna O-ring is 50A. 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.



Customer Questions & Answers

Customer Reviews

4.9 out of 5 stars
5 star
82
4 star
6
3 star
2
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0
1 star
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See all 90 customer reviews
It makes putting them on so much faster and easier.
Weng
These work great on my keyboard with Cherry MX Brown keys.
Marc Armstrong
I had no luck finding these at the local hardware stores.
rhd

Most Helpful Customer Reviews

28 of 28 people found the following review helpful By G. Farnsworth on August 17, 2012
Size Name: 008 Verified Purchase
I purchased this to modify my Cooler Master Quickfire Storm mechanical keyboard. The keyboard features Cherry MX blue keys, which make a clicky sound when depressed 2 mm. That click is not a problem, but if you push them down the full 4 mm, there is an additional clack that is quite loud and the abrupt stop is also a bit jarring to the hands. The right solution is to purchase O rings like this and install them on the bottom of every keytop. The 3/16" interior dimension version is what's wanted.

This is a pack of 125, which is perfect for a keyboard (you will have a few left over). They fit snugly and easily and had the desired effect: the bottoming out feels softer, is far quieter, and is less jarring on the hands. It also decreases the travel of the key. The difference is not huge, but it is noticeable to me. I also tried putting two of these on the bottom of some of the keys because I would like a really short travel keyboard. The result was an even softer, shorter travel stroke, but if you didn't hit it hard it didn't activate, so I had to remove them. You can really only use one of these per key.

I would be interested in thicker (same ID but larger OD) versions of these, and also the softer 40A hardness, which is very popular among keyboard modders. They are hard to find, though. The material is fine for the purpose (I don't think the pink stuff would be better in any meaningful way).

Anyway This is by far the cheapest and most convenient source of keyboard-modifying O rings that I have found, so I suggest them to anyone with a mechanical keyboard based on Cherry MX switches (which is almost all of them). Excellent product and price.

Thanks!
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25 of 27 people found the following review helpful By Sitting in Seattle TOP 1000 REVIEWER on January 30, 2013
Size Name: 008 Verified Purchase
I got a Filco keyboard with Cherry MX Brown switches. I love the feel of the keyboard but it is a bit loud when the keys bottom out (hitting the plate). After reading a lot of positive reviews about modding the keys, I figured these were worth a try for the price.

I'm glad I did. The keyboard is now much quieter and noticeably softer to type on. In particular, I no longer worry about the noise that it makes that might bother my officemates. The one downside is that the keyboard now feels a bit less like a workout on the fingers. Overall, that's worth it for me, and worth trying if the noise bothers you at all.

Installation: there is not a lot of information here on exactly how the installation works. So I'll try to describe it; please supplement with videos from YouTube for more coverage. There are two primary parts to installation: removing and replacing the keys -- which is different for regular keys (most of them) vs. wide keys (space bar, enter, shift keys, backspace). The second part is putting the O-ring onto the key, and I'll start with that.

O-ring onto the key: when you turn the key over, you'll see a round column with a plus-sign shaped hole in it, in the center of the key. Just hold the o-ring on one side of the column and roll it over and onto the column. It will fit snugly. Press it down as far as possible with your fingers; it's not necessary to push it all the way down, but it may avoid problems if it's pushed down far enough to be slightly below the edge level. If a key doesn't activate well after reinstalling, just remove the key cap again (see below) and push the ring down a little more.

Keys on & off (regular keys): you'll want a
...Read more ›
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13 of 14 people found the following review helpful By RussellWilson on July 23, 2013
Size Name: 008 Verified Purchase
This is by no means a bad product. As other reviews have mentioned, the improvement is very noticeable when you add the o-rings to your mechanical keyboard. I have two Razer blackwidow ultimate keyboards, the one with o-ring is much quieter, and you can slightly improve you typing speed due to the reduced key travel.

However, here is what you shall be aware of, backlit keyboard owners. The o-ring will block some of the light coming from the led, making letter partially lit and is definitely not very pleasing. If you are on the market for some o-rings, try transparent ones. Seems there is one type on amazon, but not sure whether it could improve backlighting. You may also find some on ebay, which ships from China.
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14 of 16 people found the following review helpful By The E on June 3, 2012
Size Name: 008 Verified Purchase
I bought a pack of the 3/16" ID, 1/16"Width O rings for a decidedly less than scientific or industrial use (to lower the travel distance on my mechanical keyboard) and let me tell you, they work and look just great. Now since these O rings meet Aerospace Standard AS568A and can withstand temperatures up to 121 degrees C, these O-rings will be *just* good enough for my exacting demands as a keyboard enthusiast. Great buy!
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10 of 12 people found the following review helpful By Morphling on April 10, 2013
Size Name: 008 Verified Purchase
These rings, as made evident in other reviews, are to help either quiet or lower the travel distance of a mechanical keyboard (or both). I put these on my full sized keyboard with cherry mx black switches.

You get the quoted amount in the package and none were made poorly or broken or anything. Each one fit on the key cap stem perfectly. Installing these is quite a breeze really as long as you make sure you read how to pull off a key with a stabilizer bar (space bar, enter keys, etc. have these). You get more than necessary for even a full sized board so if one does break or gets lost or falls between something you can't get, you're covered.

The value on these puppies is awesome. They are approximately half the price of other places - I suppose you could go cheaper and make your own but that seems so time consuming as to be absurd. Also, you can easily install these yourself so don't waste money on that - a mechanical keyboard is meant to be taken apart and put back together easily.

Edit 6/25/13 - This addition is to simply let you know that I've found another use for these in the computer world. I used them to dampen the sound/vibration on case fans for my computer. It's just wide enough to let the screw through and enough to thickness to help keep it marginally quieter. Given the pack I got had many extras, I put 1 of each of these wherever a screw and fan met in my case that I could. Just awesome.
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