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Buna O-Ring, 90A Durometer, Round, Black

Available in multiple versions

4.5 out of 5 stars 16 customer reviews

Price: $2.43 - $24.01
Product Specifications
Brand Name Small Parts
Material Type Nitrile Rubber
Hardness 90 A Durometer
System of Measurement Inch
Color Black
Cross Section Shape Round
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Specification Met AS568A
Durometer 90a
UNSPSC Code 31410000

This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of ... See more product details


Currently showing 1-20 of 632 Next »
Size Nominal Inside Diameter Nominal Outside Diameter Nominal Width Inside Diameter Outside Diameter Overall Width Number of Items Part Number
The Amazon Standard Item Number (ASIN) uniquely identifies the item in the Amazon catalog.
Price Quantity
   
001 0.029 inches 3/32 inches 0.04 inches 0.029 inches 3/32 inches 0.04 inches 100 B0051XYKV6
$6.24
001 0.029 inches 3/32 inches 0.040 inches 0.029 inches 0.109 inches 0.040 inches 1000 B00M90AR6G
$13.09
002 0.042 inches 9/64 inches 0.05 inches 0.042 inches 9/64 inches 0.05 inches 100 B0051XYKY8
$6.34
002 0.042 inches 9/64 inches 0.050 inches 0.042 inches 0.142 inches 0.050 inches 1000 B00M90AR7A
$12.89
003 0.056 inches 3/16 inches 0.06 inches 0.056 inches 3/16 inches 0.06 inches 100 B0051XYL2E
$5.71
003 0.056 inches 3/16 inches 0.060 inches 0.056 inches 0.176 inches 0.060 inches 1000 B00M90AR7U
$12.69
004 0.07 inches 13/64 inches 0.07 inches 0.07 inches 13/64 inches 0.07 inches 100 B0051XYL8S
$6.15
004 0.070 inches 13/64 inches 0.070 inches 0.070 inches 0.210 inches 0.070 inches 1000 B00M90AONW
$12.69
005 0.101 inches 7/32 inches 0.07 inches 0.101 inches 7/32 inches 0.07 inches 100 B0051XYLAG
$4.44
005 0.101 inches 7/32 inches 0.070 inches 0.101 inches 0.241 inches 0.070 inches 1000 B00M90AP0E
$11.89
006 0.114 inches 1/4 inches 0.07 inches 0.114 inches 1/4 inches 0.07 inches 100 B0051XYLDI
$4.46
006 0.114 inches 1/4 inches 0.070 inches 0.114 inches 0.254 inches 0.070 inches 1000 B00M90AOY6
$12.29
007 0.145 inches 9/32 inches 0.07 inches 0.145 inches 9/32 inches 0.07 inches 100 B0051XYLI8
$5.48
007 0.145 inches 9/32 inches 0.070 inches 0.145 inches 0.285 inches 0.070 inches 1000 B00M90AOMS
$12.29
008 0.176 inches 5/16 inches 0.07 inches 0.176 inches 5/16 inches 0.07 inches 100 B0051XYLK6
$4.52
008 0.176 inches 5/16 inches 0.070 inches 0.176 inches 0.316 inches 0.070 inches 1000 B00M90AOLY
$12.29
009 0.208 inches 11/32 inches 0.07 inches 0.208 inches 11/32 inches 0.07 inches 100 B0051XYLO2
$5.10
009 0.208 inches 11/32 inches 0.070 inches 0.208 inches 0.348 inches 0.070 inches 1000 B00M90ALOY
$12.29
010 0.239 inches 3/8 inches 0.07 inches 0.239 inches 3/8 inches 0.07 inches 100 B0051XYLSS
$4.84
010 0.239 inches 3/8 inches 0.070 inches 0.239 inches 0.379 inches 0.070 inches 1000 B00M90ALJE
$12.29
Currently showing 1-20 of 632 Next »
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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 90A 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 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: B0052AU0W6
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (16 customer reviews)
  • Product Warranty: For warranty information about this product, please click here

Product Description

This O-ring is made of black Buna-nitrile (Buna-N) and has a durometer of 90A. 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, and has 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 90A. 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 Reviews

Top Customer Reviews

Size: 111Nominal Width: 0.103Overall Width: 0.103Outside Diameter: 5/8Inside Diameter: 0.424Nominal Inside Diameter: 0.424Number of Items: 100Nominal Outside Diameter: 5/8 Verified Purchase
Worked perfectly for my garden hose plastic quick disconnects. It sure beats buying the sets all over or. For just pennies, I can breath new life into the plethora of quick-disconnects around my yard. I fear I'd have to buy expensive brass fittings to get reasonable life from garden hose quick disconnects. Now, I've doubled their life for a couple of bucks and I have tons to spare. If you are in the same boat, you've GOT to get these.
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Size: 011Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 7/16Inside Diameter: 0.301Nominal Inside Diameter: 0.301Number of Items: 100Nominal Outside Diameter: 7/16 Verified Purchase
Each one of these little circles of perfection represents everything I've ever dreamed of in an o-ring. I only needed one, but now am am rich with an over-abundance, having 99 extra for a nominal fee.
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Size: 015Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 11/16Inside Diameter: 0.551Nominal Inside Diameter: 0.551Number of Items: 100Nominal Outside Diameter: 11/16 Verified Purchase
Worked great for my vape charms. Very sturdy and stretched like I needed them to. I will buy them again.
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Size: 426Nominal Width: 0.275Overall Width: 0.275Outside Diameter: 5-1/8Inside Diameter: 4.6Nominal Inside Diameter: 4.6Number of Items: 10Nominal Outside Diameter: 5-1/8 Verified Purchase
Packaged well and works as expected. Used a belts for my P20 scroll saw since the original ones are impossible to find now. This is a great bargain since one belt for the saw is typically $20. Thank you very much.
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Size: 453Nominal Width: 0.275Overall Width: 0.275Outside Diameter: 12-1/2Inside Diameter: 11.975Nominal Inside Diameter: 11.975Number of Items: 2Nominal Outside Diameter: 12-1/2 Verified Purchase
453 o-ring should have 12" ID per description, but it actually was more like 14". Had to return it. Could not order another since any replacement would have the same order number and likely the same problem.
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Size: 011Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 7/16Inside Diameter: 0.301Nominal Inside Diameter: 0.301Number of Items: 100Nominal Outside Diameter: 7/16 Verified Purchase
I purchased this product for a particular application and they perform without a hitch. Buying these in bulk from this seller is far more economical than running down the local hardware store.
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Size: 009Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 11/32Inside Diameter: 0.208Nominal Inside Diameter: 0.208Number of Items: 100Nominal Outside Diameter: 11/32 Verified Purchase
I used these on a paintball marker where I had been destroying lots of O-rings. These have lasted much longer than the factory rings plus they are significantly cheaper.
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Size: 037Nominal Width: 0.07Overall Width: 0.07Outside Diameter: 2-5/8Inside Diameter: 2.489Nominal Inside Diameter: 2.489Number of Items: 50Nominal Outside Diameter: 2-5/8 Verified Purchase
Aquasana stopped sending O-rings w/their replacement filters so I measured and found these- way more than I wanted to buy- and they fit perfectly.
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