BS Buna O-Rings
Buna 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 |
---|---|---|---|---|---|---|---|---|---|---|
BS153 B-90 |
IntegrationID
N/A 184902 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 3.487 in88.57 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -153 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS145 B-70 |
IntegrationID
N/A 184917 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 2.550 in64.77 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -145 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS139 B-70 |
IntegrationID
N/A 184929 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 2.175 in55.25 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -139 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS132 B-70 |
IntegrationID
N/A 184943 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 1.737 in44.12 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -132 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS125 B-90 |
IntegrationID
N/A 184958 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 1.299 in32.99 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -125 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS119 B-90 |
IntegrationID
N/A 184970 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 0.924 in23.47 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -119 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS112 B-90 |
IntegrationID
N/A 184984 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 90 | Inside Diameter N/A 0.487 in12.37 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -112 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS104 B-70 |
IntegrationID
N/A 184999 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.103 in2.62 mm | Durometer N/A 70 | Inside Diameter N/A 0.112 in2.84 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -104 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS47 B-70 |
IntegrationID
N/A 185011 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 70 | Inside Diameter N/A 4.489 in114.02 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -047 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS40 B-70 |
IntegrationID
N/A 185025 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 70 | Inside Diameter N/A 2.864 in72.75 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -040 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS31 B-90 |
IntegrationID
N/A 185044 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 90 | Inside Diameter N/A 1.739 in44.17 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -031 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS25 B-90 |
IntegrationID
N/A 185056 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 90 | Inside Diameter N/A 1.176 in29.87 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -025 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS18 B-90 |
IntegrationID
N/A 185070 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 90 | Inside Diameter N/A 0.739 in18.77 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -018 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS10 B-70 |
IntegrationID
N/A 185085 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 70 | Inside Diameter N/A 0.239 in6.07 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -010 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS4 B-70 |
IntegrationID
N/A 185097 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.070 in1.78 mm | Durometer N/A 70 | Inside Diameter N/A 0.070 in1.78 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -004 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS449A B-70 |
IntegrationID
N/A 185111 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 10.225 in259.72 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -449A | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries.v |
BS903 B-70 |
IntegrationID
N/A 184193 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.064 in1.63 mm | Durometer N/A 70 | Inside Diameter N/A 0.301 in7.65 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -903 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS903 B-90 |
IntegrationID
N/A 184194 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.064 in1.63 mm | Durometer N/A 90 | Inside Diameter N/A 0.301 in7.65 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -903 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS902 B-70 |
IntegrationID
N/A 184195 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.064 in1.63 mm | Durometer N/A 70 | Inside Diameter N/A 0.239 in6.07 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -902 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS902 B-90 |
IntegrationID
N/A 184196 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.064 in1.63 mm | Durometer N/A 90 | Inside Diameter N/A 0.239 in6.07 mm | CSW Tolerance N/A 0.003 in0.08 mm | BS Number N/A -902 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS886 B-70 |
IntegrationID
N/A 184197 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 7.875 in200.03 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -886 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS886 B-90 |
IntegrationID
N/A 184198 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 7.875 in200.03 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -886 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS884 B-70 |
IntegrationID
N/A 184199 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 7.625 in193.68 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -884 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS884 B-90 |
IntegrationID
N/A 184200 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 90 | Inside Diameter N/A 7.625 in193.68 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -884 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |
BS882 B-70 |
IntegrationID
N/A 184201 |
Type N/A BS Standard O-Ring | Material N/A Buna | Cross Section Width N/A 0.275 in6.99 mm | Durometer N/A 70 | Inside Diameter N/A 7.375 in187.33 mm | CSW Tolerance N/A 0.006 in0.15 mm | BS Number N/A -882 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military defense and agriculture industries. |