BS Buna O-Rings
BS O-Rings
British Standard O-Rings are very similar to Standard O-Rings in the fact that they are both standardized imperically. The British Standard however, incorporates some extended sizes in the 1/4" nominal cross section group for an even broader application range. British Standard O-Rings serve a variety of industries including aerospace, paint, food, and chemical transport. 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.For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
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.For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
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Cross Section Width (in)
Cross Section Width (mm)
Durometer
Inside Diameter (in)
Inside Diameter (mm)
Item # |
IntegrationID |
Type |
Material |
Cross Section Width |
Durometer |
Inside Diameter |
CSW Tolerance |
BS Number |
Call for a Quote |
O-Ring Industries |
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BS217 B-90 BS217 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184818 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 1.171 in29.74 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -217 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS216 B-70 BS216 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184819 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 1.109 in28.17 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -216 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS216 B-90 BS216 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184820 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 1.109 in28.17 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -216 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS215 B-70 BS215 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184821 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 1.046 in26.57 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -215 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS215 B-90 BS215 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184822 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 1.046 in26.57 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -215 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS214 B-70 BS214 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184823 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.984 in24.99 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -214 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS214 B-90 BS214 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184824 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.984 in24.99 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -214 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS213 B-70 BS213 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184825 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.921 in23.39 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -213 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS213 B-90 BS213 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184826 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.921 in23.39 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -213 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS212 B-70 BS212 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184827 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.859 in21.82 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -212 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS212 B-90 BS212 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184828 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.859 in21.82 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -212 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS211 B-70 BS211 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184829 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.796 in20.22 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -211 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS211 B-90 BS211 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184830 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.796 in20.22 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -211 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS210 B-70 BS210 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184831 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.734 in18.64 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -210 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS210 B-90 BS210 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184832 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.734 in18.64 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -210 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS209 B-70 BS209 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184833 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.672 in17.07 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -209 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS209 B-90 BS209 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184834 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.672 in17.07 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -209 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS208 B-70 BS208 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184835 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.609 in15.47 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -208 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS208 B-90 BS208 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184836 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.609 in15.47 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -208 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS207 B-70 BS207 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184837 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.549 in13.94 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -207 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS207 B-90 BS207 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184838 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.549 in13.94 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -207 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS206 B-70 BS206 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184839 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.484 in12.29 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -206 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS206 B-90 BS206 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184840 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.484 in12.29 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -206 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS205 B-70 BS205 B-70/Asset/oring21.jpg |
IntegrationID
N/A 184841 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 0.421 in10.69 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -205 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS205 B-90 BS205 B-90/Asset/oring21.jpg |
IntegrationID
N/A 184842 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 90 | Inside Diameter N/A 0.421 in10.69 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -205 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |