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202 Buna-N O-Ring, 90A Durometer, Round, Black, 1/4" ID, 1/2" OD, 1/8" Width (Pack of 50)

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4.5 out of 5 stars 16 customer reviews
Price: $6.21 ($0.12 / O-Rings) & FREE Shipping on orders over $49. Details
Only 3 left in stock (more on the way).
Want it tomorrow, April 26? Order within and choose One-Day Shipping at checkout. Details
Ships from and sold by Amazon.com.
Product Specifications
Part Number 202-7490
Inside Diameter 0.234  inches
Inside Diameter Tolerance 0.005  inches
Outside Diameter 0.512  inches
Overall Width 0.139  inches
Width Tolerance 0.004  inches
Nominal Inside Diameter 0.234  inches
Nominal Outside Diameter 1/2  inches
Nominal Width 0.139  inches
Number of Items 50
Outside Diameter 1/2  inches
Size 202
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 Black
Cross Section Shape Round
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Specification Met AS568A
Durometer 90a
UNSPSC Code 31410000
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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 Weight: 0.8 ounces (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: B0051XYYMQ
  • Item model number: 202
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (16 customer reviews)
  • Amazon Best Sellers Rank: #455,481 in Industrial & Scientific (See Top 100 in Industrial & Scientific)

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Customer Reviews

Top Customer Reviews

5.0 out of 5 starsCould This Be Magic?
By Costello on July 17, 2013
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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1.0 out of 5 starsPoor tolerance on size
By Roncerr on December 16, 2012
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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5.0 out of 5 starsGreat for Aquasana countertop filter
By Walker Boh on October 31, 2012
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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5.0 out of 5 starsThey're o-rings
By Matt on January 27, 2013
Size: 001Nominal Width: 0.04Overall Width: 0.04Outside Diameter: 3/32Inside Diameter: 0.029Nominal Inside Diameter: 0.029Number of Items: 100Nominal Outside Diameter: 3/32 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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5.0 out of 5 starsGood n tuff
By Charles R. Elkins on February 3, 2013
Size: 322Nominal Width: 0.21Overall Width: 0.21Outside Diameter: 1-5/8Inside Diameter: 1.225Nominal Inside Diameter: 1.225Number of Items: 50Nominal Outside Diameter: 1-5/8 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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1.0 out of 5 starsO-Rings received were wrong size
By Roncerr on December 16, 2012
Verified Purchase
Buna O-Ring, 90A Durometer, Round, Black Website says the 453 o-ring is 12" ID. Even though the sealed bag was labled "453" and had the correct part numbers as shown on the web page, it actually contained 14" o-rings. I had to return it to Amazon for a $15 refund, since there is no way to exchange it for the correct part. Does anyone know where I can get a 12" ID o-ring 1/4" to 1/2" in cross-section?
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5.0 out of 5 starsI purchased this product for a particular application and they ...
By Paul E Sullivan on November 15, 2014
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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4.0 out of 5 starsGood buy
By lottp on September 25, 2014
Size: 002Nominal Width: 0.05Overall Width: 0.05Outside Diameter: 9/64Inside Diameter: 0.042Nominal Inside Diameter: 0.042Number of Items: 100Nominal Outside Diameter: 9/64 Verified Purchase
You get a lot for your money. They appear to be very consistent and of good quality. Very durable.
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