AS568 Buna O-Rings
Standard O-Rings (AS568)
Standard O-Rings are available in 369 sizes as set up by the Aerospace Standard 568 published by the Society of Automotive Engineers. These sizes are designated by dash numbers shown on the 568 DASH Chart and are standardized by imperial dimensions. Standard O-Rings are specified by their inside diameter and cross section width. AS568 is the most commonly used standard in the U.S. for aerospace, automotive and general industrial applications. For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart. Buna is also known as: Nitrile, NBR, N, Buna-N.
Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content is varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases.
Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -65 to +275°F(-54 to +135°C), nitrile is the most widely used elastomer in the seal industry today.
Inherently nitrile does not possess good resistance to ozone, sunlight or weather, but this can be substantially improved through compounding.
Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content is varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases.
Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -65 to +275°F(-54 to +135°C), nitrile is the most widely used elastomer in the seal industry today.
Inherently nitrile does not possess good resistance to ozone, sunlight or weather, but this can be substantially improved through compounding.
Item # |
IntegrationID |
Type |
Material |
Cross Section Width |
Durometer |
Inside Diameter |
Cross Section Tolerance +/- |
Inside Diameter Tolerance +/- |
Size Reference - AS568 |
Alternate P/N |
Units of Measure |
Tube Size O.D. |
Call for a Quote |
O-Ring Industries |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
-908 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.087 in | Durometer N/A 90 | Inside Diameter N/A 0.644 in | Cross Section Tolerance +/- N/A 0.003 in | Inside Diameter Tolerance +/- N/A 0.009 in | Size Reference - AS568 N/A -908 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 1/2 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-909 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.097 in | Durometer N/A 90 | Inside Diameter N/A 0.706 in | Cross Section Tolerance +/- N/A 0.003 in | Inside Diameter Tolerance +/- N/A 0.009 in | Size Reference - AS568 N/A -909 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 9/16 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-910 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.097 in | Durometer N/A 90 | Inside Diameter N/A 0.755 in | Cross Section Tolerance +/- N/A 0.003 in | Inside Diameter Tolerance +/- N/A 0.009 in | Size Reference - AS568 N/A -910 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 5/8 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-911 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.116 in | Durometer N/A 90 | Inside Diameter N/A 0.863 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.009 in | Size Reference - AS568 N/A -911 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 11/16 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-912 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.116 in | Durometer N/A 90 | Inside Diameter N/A 0.924 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.009 in | Size Reference - AS568 N/A -912 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 3/4 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-913 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.116 in | Durometer N/A 90 | Inside Diameter N/A 0.986 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.01 in | Size Reference - AS568 N/A -913 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 13/16 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-914 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.116 in | Durometer N/A 90 | Inside Diameter N/A 1.047 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.01 in | Size Reference - AS568 N/A -914 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 7/8 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-916 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.116 in | Durometer N/A 90 | Inside Diameter N/A 1.171 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.01 in | Size Reference - AS568 N/A -916 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 1 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-918 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.116 in | Durometer N/A 90 | Inside Diameter N/A 1.355 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.012 in | Size Reference - AS568 N/A -918 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 1-1/8 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-920 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.118 in | Durometer N/A 90 | Inside Diameter N/A 1.475 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.014 in | Size Reference - AS568 N/A -920 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 1-1/4 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-924 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.118 in | Durometer N/A 90 | Inside Diameter N/A 1.720 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.014 in | Size Reference - AS568 N/A -924 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 1-1/2 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-928 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.118 in | Durometer N/A 90 | Inside Diameter N/A 2.090 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.018 in | Size Reference - AS568 N/A -928 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 1-3/4 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. | |
-932 Buna-90 | Type N/A AS568 Standard O-Rings | Material N/A Buna | Cross Section Width N/A 0.118 in | Durometer N/A 90 | Inside Diameter N/A 2.337 in | Cross Section Tolerance +/- N/A 0.004 in | Inside Diameter Tolerance +/- N/A 0.018 in | Size Reference - AS568 N/A -932 | Alternate P/N N/A | Units of Measure N/A Imperial | Tube Size O.D. N/A 2 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |