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  • 320 Buna-N O-Ring, 90A Durometer, Round, Black, 1-1/8" ID, 1-1/2" OD, 3/16" Width (Pack of 50)
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320 Buna-N O-Ring, 90A Durometer, Round, Black, 1-1/8" ID, 1-1/2" OD, 3/16" Width (Pack of 50)

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Price: $8.77 & FREE Shipping on orders over $35. Details
Only 1 left in stock (more on the way).
Ships from and sold by Amazon.com.

Product Specifications
Part Number 320-7490
Actual ID 1.1  inches
Inside Diameter Tolerance 0.012  inches
Actual OD 1.52  inches
Actual Width 0.21  inches
Width Tolerance 0.005  inches
Nominal ID 1-1/8  inches
Nominal OD 1-1/2  inches
Nominal Width 3/16  inches
Dash Size 320
Durometer 90A
Pkg Qty 50
Specification for this product family (See all  products)
Brand Name Small Parts
Material Type Nitrile Rubber
Hardness 90 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 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 Weight: 4.8 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0051XZ5W4
  • Item model number: 320
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (11 customer reviews)
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Frequently Bought Together

320 Buna-N O-Ring, 90A Durometer, Round, Black, 1-1/8" ID, 1-1/2" OD, 3/16" Width (Pack of 50) + 008 Buna-N O-Ring, 70A Durometer, Black, 3/16" ID, 5/16" OD, 1/16" Width (Pack of 100) + 021 Viton O-Ring, 75A Durometer, Round, Black, 15/16" ID, 1-1/16" OD, 1/16" Width (Pack of 50)
Price for all three: $18.36

Buy the selected items together

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 Questions & Answers

Customer Reviews

4.2 out of 5 stars
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Most Helpful Customer Reviews

1 of 1 people found the following review helpful By Costello on July 17, 2013
Size Name: 011 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 Name: 111 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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By Scott Walter on May 12, 2014
Size Name: 426 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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By Elizabeth Edmiston on April 17, 2014
Size Name: 015 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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By Charles R. Elkins on February 3, 2013
Size Name: 322 Verified Purchase
THis is good hard rubber, not stretchy as I feared. Serves the purpose. Had to buy a few more than needed but they were cheap
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By Matt on January 27, 2013
Size Name: 001 Verified Purchase
The o-rings I ordered are in fact tough buna 90a. Most of the sizes are fairly priced, and the o-rings themselves quality. Recommended
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