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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.
BS O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

BS Number

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O-Ring Industries

Quantity
BS331 S-70 N/A
186270 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 2.225 in56.52 mm N/A 0.005 in0.13 mm N/A -331 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS330 S-70 N/A
186271 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 2.100 in53.34 mm N/A 0.005 in0.13 mm N/A -330 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS329 S-70 N/A
186272 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.975 in50.17 mm N/A 0.005 in0.13 mm N/A -329 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS328 S-70 N/A
186273 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.850 in46.99 mm N/A 0.005 in0.13 mm N/A -328 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS327 S-70 N/A
186274 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.725 in43.82 mm N/A 0.005 in0.13 mm N/A -327 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS326 S-70 N/A
186275 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.600 in40.64 mm N/A 0.005 in0.13 mm N/A -326 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS325 S-70 N/A
186276 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.475 in37.47 mm N/A 0.005 in0.13 mm N/A -325 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS324 S-70 N/A
186277 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.350 in34.29 mm N/A 0.005 in0.13 mm N/A -324 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS323 S-70 N/A
186278 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.287 in32.69 mm N/A 0.005 in0.13 mm N/A -323 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS322 S-70 N/A
186279 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.225 in31.12 mm N/A 0.005 in0.13 mm N/A -322 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS321 S-70 N/A
186280 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.162 in29.51 mm N/A 0.005 in0.13 mm N/A -321 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS320 S-70 N/A
186281 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.100 in27.94 mm N/A 0.005 in0.13 mm N/A -320 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS319 S-70 N/A
186282 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 1.037 in26.34 mm N/A 0.005 in0.13 mm N/A -319 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS318 S-70 N/A
186283 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.975 in24.77 mm N/A 0.005 in0.13 mm N/A -318 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS317 S-70 N/A
186284 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.912 in23.16 mm N/A 0.005 in0.13 mm N/A -317 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS316 S-70 N/A
186285 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.850 in21.59 mm N/A 0.005 in0.13 mm N/A -316 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS315 S-70 N/A
186286 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.787 in19.99 mm N/A 0.005 in0.13 mm N/A -315 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS314 S-70 N/A
186287 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.725 in18.42 mm N/A 0.005 in0.13 mm N/A -314 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS313 S-70 N/A
186288 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.662 in16.81 mm N/A 0.005 in0.13 mm N/A -313 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS312 S-70 N/A
186289 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.600 in15.24 mm N/A 0.005 in0.13 mm N/A -312 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS311 S-70 N/A
186290 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.537 in13.64 mm N/A 0.005 in0.13 mm N/A -311 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS310 S-70 N/A
186291 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.475 in12.07 mm N/A 0.005 in0.13 mm N/A -310 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS309 S-70 N/A
186292 		N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 0.412 in10.46 mm N/A 0.005 in0.13 mm N/A -309 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS281 S-70 N/A
186293 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 14.984 in380.59 mm N/A 0.004 in0.10 mm N/A -281 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS280 S-70 N/A
186294 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 13.984 in355.19 mm N/A 0.004 in0.10 mm N/A -280 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
Unit of Measure
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