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  • 228 Buna-N O-Ring, 70A Durometer, Black, 2-1/4" ID, 2-1/2" OD, 1/8" Width (Pack of 10)
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228 Buna-N O-Ring, 70A Durometer, Black, 2-1/4" ID, 2-1/2" OD, 1/8" Width (Pack of 10)


Price: $1.25 & FREE Shipping on orders over $35. Details
Only 5 left in stock (more on the way).
Ships from and sold by Amazon.com.

Specifications for this item
Brand Name Small Parts
Part Number ORB-228-10
Material Type Nitrile Rubber
Hardness 70A
System of Measurement Inch
Color Name Black
Cross Section Shape Round
Inside Diameter 2.234  inches
Inside Diameter Tolerance 0.02  inches
Outside Diameter 2.512  inches
Overall Width 0.139  inches
Width Tolerance 0.004  inches
Nominal Inside Diameter 2.234  inches
Nominal Outside Diameter 2-1/2  inches
Nominal Width 0.139  inches
LowerTemperature Range -30  Degrees Fahrenheit
Upper Temperature Range 250  Degrees Fahrenheit
Specification Met AS568A
Durometer 70A
Number of Items 10
Outside Diameter 2-1/2  inches
Size Name 228
UNSPSC Code 31410000

This O-ring is made of black Buna-nitrile, is round in cross-section, has a... Read full product description



Product Features

  • Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids and hydrocarbons
  • Can be used across a wide temperature range from -30 degrees F (-34 degrees C) to 250 degrees F (121 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 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: B000FMWNPS
  • Item model number: 228
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (3 customer reviews)
  • Amazon Best Sellers Rank: #30,652 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
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Frequently Bought Together

228 Buna-N O-Ring, 70A Durometer, Black, 2-1/4" ID, 2-1/2" OD, 1/8" Width (Pack of 10) + 227 Buna-N O-Ring, 70A Durometer, Black, 2-1/8" ID, 2-3/8" OD, 1/8" Width (Pack of 10)
Price for both: $5.13

Buy the selected items together

Product Description

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

Buna-nitrile can have high tensile strength, and abrasion, tear, and compression set resistance. It can be used in temperatures between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C), and is compatible for use with petroleum, HFA, HFB and HFC fluids, vegetable oil, alcohol, acids and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering and should therefore not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.

This Buna 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.

These Buna-nitrile O-rings meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.

Customer Reviews

3.7 out of 5 stars
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Most Helpful Customer Reviews

Verified Purchase
I needed new O rings for my 20" Centerline Archer IIs and could not see paying what Centerline wanted for them. These are a perfect fit once you wrestle them on. Just remember to use a bit of oil when seating the center cap to the wheel.
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By Jgrabs on May 4, 2013
Verified Purchase
i bought these to put a center cap on my Centerline wheels. Centerline wants $5 an O ring and you must buy 4. Save yourself the money and buy a 10 pack of these.
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0 of 3 people found the following review helpful By Weiping Xiao on November 25, 2013
Verified Purchase
The width is incorrect. it is too thick, ID and OD are correct. Therefore they are useless. Will not buy again.
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