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 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
439B90 439B90/Asset/oring71.jpg |
IntegrationID
N/A 190424 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 6.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.040 in1.01 mm | Size Reference - AS568 N/A -439 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
440B70 440B70/Asset/oring71.jpg |
IntegrationID
N/A 190425 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 6.725 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.040 in1.01 mm | Size Reference - AS568 N/A -440 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
440B90 440B90/Asset/oring71.jpg |
IntegrationID
N/A 190426 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 6.725 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.040 in1.01 mm | Size Reference - AS568 N/A -440 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
441B70 441B70/Asset/oring71.jpg |
IntegrationID
N/A 190427 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 6.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.040 in1.01 mm | Size Reference - AS568 N/A -441 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
441B90 441B90/Asset/oring71.jpg |
IntegrationID
N/A 190428 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 6.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.040 in1.01 mm | Size Reference - AS568 N/A -441 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
442B70 442B70/Asset/oring71.jpg |
IntegrationID
N/A 190429 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 7.225 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -442 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
442B90 442B90/Asset/oring71.jpg |
IntegrationID
N/A 190430 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 7.225 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -442 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
443B70 443B70/Asset/oring71.jpg |
IntegrationID
N/A 190431 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 7.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -443 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
443B90 443B90/Asset/oring71.jpg |
IntegrationID
N/A 190432 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 7.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -443 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
444B70 444B70/Asset/oring71.jpg |
IntegrationID
N/A 190433 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 7.725 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -444 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
444B90 444B90/Asset/oring71.jpg |
IntegrationID
N/A 190434 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 7.725 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -444 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
445B70 445B70/Asset/oring71.jpg |
IntegrationID
N/A 190435 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 7.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -445 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
445B90 445B90/Asset/oring71.jpg |
IntegrationID
N/A 190436 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 7.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.045 in1.14 mm | Size Reference - AS568 N/A -445 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
446B70 446B70/Asset/oring71.jpg |
IntegrationID
N/A 190437 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 8.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -446 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
446B90 446B90/Asset/oring71.jpg |
IntegrationID
N/A 190438 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 8.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -446 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
447B70 447B70/Asset/oring71.jpg |
IntegrationID
N/A 190439 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 8.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -447 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
447B90 447B90/Asset/oring71.jpg |
IntegrationID
N/A 190440 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 8.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -447 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
448B70 448B70/Asset/oring71.jpg |
IntegrationID
N/A 190441 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 9.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -448 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
448B90 448B90/Asset/oring71.jpg |
IntegrationID
N/A 190442 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 9.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -448 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
449B70 449B70/Asset/oring71.jpg |
IntegrationID
N/A 190443 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 9.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -449 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
449B90 449B90/Asset/oring71.jpg |
IntegrationID
N/A 190444 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 9.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.055 in1.40 mm | Size Reference - AS568 N/A -449 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
450B70 450B70/Asset/oring71.jpg |
IntegrationID
N/A 190445 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 10.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.060 in1.52 mm | Size Reference - AS568 N/A -450 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
450B90 450B90/Asset/oring71.jpg |
IntegrationID
N/A 190446 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 10.475 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.060 in1.52 mm | Size Reference - AS568 N/A -450 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
451B70 451B70/Asset/oring71.jpg |
IntegrationID
N/A 190447 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 70 | Inside Diameter N/A 10.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.060 in1.52 mm | Size Reference - AS568 N/A -451 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
451B90 451B90/Asset/oring71.jpg |
IntegrationID
N/A 190448 |
Type N/A | Material N/A | Cross Section Width N/A 0.275 in | Durometer N/A 90 | Inside Diameter N/A 10.975 in | Cross Section Tolerance +/- N/A 0.006 in0.15 mm | Inside Diameter Tolerance +/- N/A 0.060 in1.52 mm | Size Reference - AS568 N/A -451 | Alternate P/N N/A | Units of Measure N/A | Tube Size O.D. N/A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |