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.
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O-Ring Industries

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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.
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.
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.
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.
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.
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.
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.
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.
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.
N/A
186295
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 12.984 in329.79 mm N/A 0.004 in0.10 mm N/A -279 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186296
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 11.984 in304.39 mm N/A 0.004 in0.10 mm N/A -278 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186297
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 11.484 in291.69 mm N/A 0.004 in0.10 mm N/A -277 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186298
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 10.984 in278.99 mm N/A 0.004 in0.10 mm N/A -276 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186299
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 10.484 in266.29 mm N/A 0.004 in0.10 mm N/A -275 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186300
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 9.984 in253.59 mm N/A 0.004 in0.10 mm N/A -274 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186301
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 9.734 in247.24 mm N/A 0.004 in0.10 mm N/A -273 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186302
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 9.484 in240.89 mm N/A 0.004 in0.10 mm N/A -272 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186303
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 9.234 in234.54 mm N/A 0.004 in0.10 mm N/A -271 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186304
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 8.984 in228.19 mm N/A 0.004 in0.10 mm N/A -270 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186305
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 8.734 in221.84 mm N/A 0.004 in0.10 mm N/A -269 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186306
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 8.484 in215.49 mm N/A 0.004 in0.10 mm N/A -268 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186307
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 8.234 in209.14 mm N/A 0.004 in0.10 mm N/A -267 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186308
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 7.984 in202.79 mm N/A 0.004 in0.10 mm N/A -266 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186309
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 7.734 in196.44 mm N/A 0.004 in0.10 mm N/A -265 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186310
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 7.484 in190.09 mm N/A 0.004 in0.10 mm N/A -264 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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