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EPDM O-Ring, 70A Durometer, Black

Available in multiple versions

4.4 out of 5 stars 28 customer reviews

Price: $2.09 - $72.87
Product Specifications
Brand Name Small Parts
Material Type EPDM (Ethylene Propylene Diene Monomer Rubber)
Hardness 70 A Durometer
System of Measurement Inch
Color Black
Cross Section Shape Round
LowerTemperature Range -70  Degrees Fahrenheit
Upper Temperature Range 300  Degrees Fahrenheit
Specification Met AS568A
Durometer 70a
UNSPSC Code 31410000

Currently showing 1-20 of 821 Next »
ASIN
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Size Nominal Inside Diameter Nominal Outside Diameter Nominal Width Inside Diameter Outside Diameter Overall Width Number of Items Each Price Quantity
   
B001D8DQB8 001 0.029 inches 3/32 inches 0.04 inches 0.029 inches 3/32 inches 0.04 inches 100 $0.29 ea.
$29.42
B0051Y030M 001 0.029 inches 3/32 inches 0.04 inches 0.029 inches 3/32 inches 0.04 inches 70 $0.04 ea.
$3.04
+ Shipping
B005282X7S 001-1/2 0.070 inches 1/8 inches 0.040 inches 0.070 inches 1/8 inches 0.040 inches 25 $0.25 ea.
$6.23
B001D8BY4E 002 0.042 inches 9/64 inches 0.05 inches 0.042 inches 9/64 inches 0.05 inches 100 $0.10 ea.
$9.76
B0051Y0370 002 0.042 inches 9/64 inches 0.05 inches 0.042 inches 9/64 inches 0.05 inches 75 $0.11 ea.
$8.31
B00M91AW3S 002 0.042 inches 9/64 inches 0.050 inches 0.042 inches 0.142 inches 0.050 inches 500 $0.04 ea.
$17.64
B001D8BY6C 003 0.056 inches 3/16 inches 0.06 inches 0.056 inches 3/16 inches 0.06 inches 100 $0.10 ea.
$9.63
B00M91AW24 003 0.056 inches 3/16 inches 0.060 inches 0.056 inches 0.176 inches 0.060 inches 500 $0.03 ea.
$16.99
B001D8HA1A 004 0.07 inches 13/64 inches 0.07 inches 0.07 inches 13/64 inches 0.07 inches 100 $0.10 ea.
$9.54
B00M91AVWA 004 0.070 inches 13/64 inches 0.070 inches 0.070 inches 0.210 inches 0.070 inches 500 $0.03 ea.
$16.54
B001E0AIKC 005 0.101 inches 7/32 inches 0.07 inches 0.101 inches 7/32 inches 0.07 inches 100 $0.11 ea.
$11.26
B00M91AQAM 005 0.101 inches 7/32 inches 0.070 inches 0.101 inches 0.241 inches 0.070 inches 500 $0.03 ea.
$16.14
B001D8A3IM 006 0.114 inches 1/4 inches 0.07 inches 0.114 inches 1/4 inches 0.07 inches 100 $0.09 ea.
$9.22
B00M91AQJ8 006 0.114 inches 1/4 inches 0.070 inches 0.114 inches 0.254 inches 0.070 inches 500 $0.03 ea.
$14.94
B001D8FRVK 007 0.145 inches 9/32 inches 0.07 inches 0.145 inches 9/32 inches 0.07 inches 100 $0.09 ea.
$9.27
B00M91AR8I 007 0.145 inches 9/32 inches 0.070 inches 0.145 inches 0.285 inches 0.070 inches 500 $0.03 ea.
$15.19
B001D8DQV8 008 0.176 inches 5/16 inches 0.07 inches 0.176 inches 5/16 inches 0.07 inches 100 $0.09 ea.
$9.31
B00M91AQMU 008 0.176 inches 5/16 inches 0.070 inches 0.176 inches 0.316 inches 0.070 inches 500 $0.03 ea.
$15.39
B001E07GFC 009 0.208 inches 11/32 inches 0.07 inches 0.208 inches 11/32 inches 0.07 inches 100 $0.11 ea.
$11.02
B00M91ALHA 009 0.208 inches 11/32 inches 0.070 inches 0.208 inches 0.348 inches 0.070 inches 500 $0.03 ea.
$15.69
Currently showing 1-20 of 821 Next »
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Product Features

  • Made of ethylene propylene diene monomer (EPDM) rubber for use with a variety of chemicals and environments
  • Can be used in a wide temperature range from -70 degrees F (-57 degrees C) to 300 degrees F (149 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

Product Description

This EPDM O-ring is black in color, round in cross-section, has a durometer of 70A, and is designed for use in a wide variety of sealing applications.

EPDM is acceptable for temperature applications between -70 degrees F (-57 degrees C) to 300 degrees F (149 degrees C). It is compatible for use with water and steam, silicone oil and grease, polar solvents (alcohols), acids, glycol-based brake fluids, ozone, and weathering. It is vulnerable to many oils, gasoline, and solvents. This material meets ASTM International standards.

This EPDM 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.

This EPDM O-ring meets standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.


Product Details

  • Shipping Information: View shipping rates and policies
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B003SLE5L8
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (28 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Size: 010Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 3/8Inside Diameter: 0.239Nominal Inside Diameter: 0.239Number of Items: 100Nominal Outside Diameter: 3/8
Like others, I was shorted in my package of 100. When I saw that someone received 99 I didn't think it was a big deal--it's easy enough to miss 1 o-ring. When my package arrived, I opened it up and took out the 2 that I needed for the job at hand. Then I thought I'd check the count. 88 o-rings! Are you serious!?! Come on, how do you leave out 12% of the quantity and think that that's OK?!

Update: I returned the package of 88 and got a replacement package. This time it was 87!
I then contacted the supplier of the seals (not Amazon). The supplier doesn't do retail, but they have a website and when I contacted them, they informed me that they package by weight and that their scale must have been off for the batch(es) in question. They sent me a new package, this time of 101. They're a stand-up operation with a process that deviated a bit. The o-rings themselves are fine and now I'm satisfied with the experience.
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I've ordered two sizes now, and neither has matched this chart here. I've measured and measured like crazy, and I've not received what I've expected. The o-rings seem to be really nice; the fault is surely mine. If you're looking for o-rings, these are the ones to get!

(Can someone explain the sizes of o-rings to me? Amazon Supply (formerly Small Parts) can't. The "Nominal Inside Diameter" column doesn't seem to make sense. I ordered a package of the 008 rings (Nominal ID 3/16") and they weren't right for my project so I ordered a package of the 011 (Nominal ID 5/16") and they were a LOT smaller than the 008s. I thought 3/16" > 5/16" (and Actual ID .301" > .176"), but I seem to be wrong! The reason I don't know exactly what I need is because this is for a craft project so I don't need to be exact, but I need something bigger than the 008 I had. Going up three seemed right. Do I need to go three in the other direction, i.e., to 005? Can you aim me towards an URL which will explain what I need to know? Thanks for helping!)
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Size: 008Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 5/16Inside Diameter: 0.176Nominal Inside Diameter: 0.176Number of Items: 100Nominal Outside Diameter: 5/16 Verified Purchase
These dampen the noise on a mechanical keyboard OK, but I removed them. They are too thick, and cut down on the travel time on my cherry mx blues too much.

They did their job, but for my use it comes down to personal preference
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Size: 228Nominal Width: 0.139Overall Width: 0.139Outside Diameter: 2-1/2Inside Diameter: 2.234Nominal Inside Diameter: 2.234Number of Items: 25Nominal Outside Diameter: 2-1/2
Item arrived on-time and in good condition in a sealed plastic bag. Labeling on the bag included general item description (EPDM O-ring black -228), part count and part and stock-keeping numbers, but omitted the size specifications. There was no obvious damage or defects and the part count was correct.

The rubber seem to be of good quality and is firm, smooth and dry, with a light residue of release-agent powder (this is acceptable). It should be noted that the cross-sections of the O-rings are not perfectly round; there is a very slight lip on the inner- and outer-most diameters. This is no doubt where the dies met for the molding process, and is unlikely to interfere with performance. Measurement of about half a dozen or so pieces revealed all actual dimensions (which differ from the nominal dimensions--I highly recommend consulting the "Product Details" section) to be within specified tolerances.

All-in-all, these seem to be fine quality O-rings, though not quite top-of-the-line. Still, for the price I paid at the time (less than $1--Small Parts's prices can fluctuate quite a bit, I recommend checking them frequently), they were an OUTSTANDING value. Recommended.
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Size: 338Nominal Width: 0.21Overall Width: 0.21Outside Diameter: 3-1/2Inside Diameter: 3.1Nominal Inside Diameter: 3.1Number of Items: 10Nominal Outside Diameter: 3-1/2 Verified Purchase
I used this size O-Ring as a rubber suspension mount for a motorcycle speedometer, as this is how they were mounted originally from the factory. Works great and now I have a lifetime supply! (minimum order was ten or twelve)
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Size: 006Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 1/4Inside Diameter: 0.114Nominal Inside Diameter: 0.114Number of Items: 100Nominal Outside Diameter: 1/4 Verified Purchase
This was the most economical way to buy a small quantity of this O-ring, which is a very small size that is not readily available elsewhere. The O-ring distributors and manufacturers need to sell in large lots that cost $40 or more. I only needed one, so this was an ideal solution.
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Size: 109Nominal Width: 0.103Overall Width: 0.103Outside Diameter: 1/2Inside Diameter: 0.299Nominal Inside Diameter: 0.299Number of Items: 100Nominal Outside Diameter: 1/2
What more can you really say ? They arrived on-time and fitted exactly what I wanted :-)
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Size: 259Nominal Width: 0.139Overall Width: 0.139Outside Diameter: 6-1/2Inside Diameter: 6.234Nominal Inside Diameter: 6.234Number of Items: 25Nominal Outside Diameter: 6-1/2 Verified Purchase
Needed this for filter/pump for the pool we put up every summer in our back yard. The o-ring arrived quickly and was exactly to the specifications listed on Amazon. As you might imagine, it worked perfectly!
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