BS Silicone 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.
This elastomer possesses mechanical properties similar to Viton®, with the exception of its slightly lower compression set resistance. It is more suitable for sensitive applications where lighter compressive forces are applied to energize the seal. This core has a Shore A hardness of 70 but it also offers a broader operating temperature range of -80°F to +500°F. (-62°C to +260°C). For more information, please see: Comparison Properties Chart, PTFE Encapsulated O-rings, Material Shelf Life, and O-ring Groove Design Chart.
This elastomer possesses mechanical properties similar to Viton®, with the exception of its slightly lower compression set resistance. It is more suitable for sensitive applications where lighter compressive forces are applied to energize the seal. This core has a Shore A hardness of 70 but it also offers a broader operating temperature range of -80°F to +500°F. (-62°C to +260°C). 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)
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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BS279 S-70 BS279 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186295 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 12.984 in329.79 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -279 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS278 S-70 BS278 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186296 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 11.984 in304.39 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -278 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS277 S-70 BS277 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186297 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 11.484 in291.69 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -277 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS276 S-70 BS276 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186298 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 10.984 in278.99 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -276 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS275 S-70 BS275 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186299 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 10.484 in266.29 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -275 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS274 S-70 BS274 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186300 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 9.984 in253.59 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -274 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS273 S-70 BS273 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186301 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 9.734 in247.24 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -273 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS272 S-70 BS272 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186302 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 9.484 in240.89 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -272 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS271 S-70 BS271 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186303 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 9.234 in234.54 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -271 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS270 S-70 BS270 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186304 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 8.984 in228.19 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -270 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS269 S-70 BS269 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186305 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 8.734 in221.84 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -269 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS268 S-70 BS268 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186306 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 8.484 in215.49 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -268 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS267 S-70 BS267 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186307 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 8.234 in209.14 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -267 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS266 S-70 BS266 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186308 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 7.984 in202.79 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -266 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS265 S-70 BS265 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186309 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 7.734 in196.44 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -265 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS264 S-70 BS264 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186310 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 7.484 in190.09 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -264 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS263 S-70 BS263 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186311 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 7.234 in183.74 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -263 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS262 S-70 BS262 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186312 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 6.984 in177.39 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -262 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS261 S-70 BS261 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186313 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 6.734 in171.04 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -261 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS260 S-70 BS260 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186314 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 6.484 in164.69 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -260 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS259 S-70 BS259 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186315 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 6.234 in158.34 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -259 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS258 S-70 BS258 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186316 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 5.984 in151.99 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -258 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS257 S-70 BS257 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186317 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 5.859 in148.82 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -257 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS256 S-70 BS256 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186318 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 5.734 in145.64 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -256 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS255 S-70 BS255 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186319 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.139 in3.53 mm | Durometer N/A 70 | Inside Diameter N/A 5.609 in142.47 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -255 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |