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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BS331 S-70 BS331 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186270 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 2.225 in56.52 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -331 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS330 S-70 BS330 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186271 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 2.100 in53.34 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -330 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS329 S-70 BS329 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186272 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.975 in50.17 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -329 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS328 S-70 BS328 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186273 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.850 in46.99 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -328 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS327 S-70 BS327 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186274 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.725 in43.82 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -327 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS326 S-70 BS326 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186275 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.600 in40.64 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -326 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS325 S-70 BS325 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186276 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.475 in37.47 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -325 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS324 S-70 BS324 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186277 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.350 in34.29 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -324 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS323 S-70 BS323 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186278 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.287 in32.69 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -323 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS322 S-70 BS322 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186279 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.225 in31.12 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -322 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS321 S-70 BS321 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186280 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.162 in29.51 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -321 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS320 S-70 BS320 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186281 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.100 in27.94 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -320 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS319 S-70 BS319 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186282 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 1.037 in26.34 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -319 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS318 S-70 BS318 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186283 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.975 in24.77 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -318 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS317 S-70 BS317 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186284 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.912 in23.16 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -317 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS316 S-70 BS316 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186285 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.850 in21.59 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -316 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS315 S-70 BS315 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186286 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.787 in19.99 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -315 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS314 S-70 BS314 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186287 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.725 in18.42 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -314 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS313 S-70 BS313 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186288 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.662 in16.81 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -313 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS312 S-70 BS312 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186289 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.600 in15.24 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -312 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS311 S-70 BS311 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186290 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.537 in13.64 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -311 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS310 S-70 BS310 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186291 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.475 in12.07 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -310 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS309 S-70 BS309 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186292 |
Type N/A BS Standard O-Ring | Material N/A Silicone | Cross Section Width N/A 0.210 in5.33 mm | Durometer N/A 70 | Inside Diameter N/A 0.412 in10.46 mm | CSW Tolerance N/A 0.005 in0.13 mm | BS Number N/A -309 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS281 S-70 BS281 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186293 |
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 14.984 in380.59 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -281 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |
BS280 S-70 BS280 S-70/Asset/oring21.jpg |
IntegrationID
N/A 186294 |
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 13.984 in355.19 mm | CSW Tolerance N/A 0.004 in0.10 mm | BS Number N/A -280 | Call for a Quote N/A | O-Ring Industries N/A O-rings are used in the military, automotive, aerospace and agriculture industries. |