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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BS254 S-70 BS254 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186320 |
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 5.484 in139.29 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -254 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS253 S-70 BS253 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186321 |
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 5.359 in136.12 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -253 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS252 S-70 BS252 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186322 |
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 5.234 in132.94 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -252 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS251 S-70 BS251 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186323 |
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 5.109 in129.77 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -251 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS250 S-70 BS250 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186324 |
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 4.984 in126.59 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -250 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS249 S-70 BS249 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186325 |
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 4.859 in123.42 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -249 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS248 S-70 BS248 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186326 |
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 4.734 in120.24 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -248 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS247 S-70 BS247 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186327 |
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 4.609 in117.07 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -247 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS246 S-70 BS246 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186328 |
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 4.484 in113.89 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -246 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS245 S-70 BS245 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186329 |
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 4.359 in110.72 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -245 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS244 S-70 BS244 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186330 |
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 4.234 in107.54 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -244 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS243 S-70 BS243 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186331 |
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 4.109 in104.37 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -243 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS242 S-70 BS242 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186332 |
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 3.984 in101.19 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -242 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS241 S-70 BS241 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186333 |
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 3.859 in98.02 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -241 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS240 S-70 BS240 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186334 |
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 3.734 in94.84 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -240 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS239 S-70 BS239 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186335 |
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 3.609 in91.67 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -239 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS238 S-70 BS238 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186336 |
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 3.484 in88.49 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -238 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS237 S-70 BS237 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186337 |
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 3.359 in85.32 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -237 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS236 S-70 BS236 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186338 |
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 3.234 in82.14 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -236 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS235 S-70 BS235 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186339 |
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 3.109 in78.97 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -235 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS234 S-70 BS234 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186340 |
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 2.984 in75.79 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -234 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS233 S-70 BS233 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186341 |
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 2.859 in72.62 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -233 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS232 S-70 BS232 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186342 |
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 2.734 in69.44 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -232 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS231 S-70 BS231 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186343 |
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 2.609 in66.27 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -231 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS230 S-70 BS230 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186344 |
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 2.484 in63.09 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -230 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |