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 |
|---|---|---|---|---|---|---|---|---|---|---|
| BS842 B-70 |
IntegrationID
N/A 184243 |
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 2.687 in68.25 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -842 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS842 B-90 |
IntegrationID
N/A 184244 |
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 2.687 in68.25 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -842 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS841 B-70 |
IntegrationID
N/A 184245 |
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 2.625 in66.68 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -841 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
| BS841 B-90 |
IntegrationID
N/A 184246 |
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 2.625 in66.68 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -841 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS840 B-70 |
IntegrationID
N/A 184247 |
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 2.563 in65.1 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -840 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS840 B-90 |
IntegrationID
N/A 184248 |
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 2.563 in65.1 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -840 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS839 B-70 |
IntegrationID
N/A 184249 |
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 2.500 in63.50 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -839 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS839 B-90 |
IntegrationID
N/A 184250 |
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 2.500 in63.50 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -839 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS838 B-70 |
IntegrationID
N/A 184251 |
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 2.437 in61.90 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -838 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS838 B-90 |
IntegrationID
N/A 184252 |
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 2.437 in61.90 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -838 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS837 B-70 |
IntegrationID
N/A 184253 |
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 2.375 in60.33 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -837 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS837 B-90 |
IntegrationID
N/A 184254 |
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 2.375 in60.33 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -837 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS836 B-70 |
IntegrationID
N/A 184255 |
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 2.313 in58.74 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -836 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS836 B-90 |
IntegrationID
N/A 184256 |
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 2.313 in58.74 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -836 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS835 B-70 |
IntegrationID
N/A 184257 |
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 2.25 in57.15 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -835 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
| BS835 B-90 |
IntegrationID
N/A 184258 |
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 2.25 in57.15 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -835 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS834 B-70 |
IntegrationID
N/A 184259 |
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 2.187 in55.55 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -834 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS834 B-90 |
IntegrationID
N/A 184260 |
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 2.187 in55.55 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -834 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS833 B-70 |
IntegrationID
N/A 184261 |
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 2.125 in53.98 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -833 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS833 B-90 |
IntegrationID
N/A 184262 |
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 2.125 in53.98 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -833 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS832 B-70 |
IntegrationID
N/A 184263 |
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 2.063 in52.39 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -832 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS832 B-90 |
IntegrationID
N/A 184264 |
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 2.063 in52.39 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -832 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS831 B-70 |
IntegrationID
N/A 184265 |
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 2.000 in50.80 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -831 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS831 B-90 |
IntegrationID
N/A 184266 |
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 2.000 in50.80 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -831 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
| BS830 B-70 |
IntegrationID
N/A 184267 |
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 1.937 in49.20 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -830 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
