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
186473
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.364 in34.65 mm N/A 0.003 in0.08 mm N/A -028 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
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
186472
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.489 in37.82 mm N/A 0.003 in0.08 mm N/A -029 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186498
N/A BS Standard O-Ring N/A Silicone N/A 0.060 in1.52 mm N/A 70 N/A 0.056 in1.42 mm N/A 0.003 in0.08 mm N/A -003 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186471
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.614 in41.00 mm N/A 0.003 in0.08 mm N/A -030 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
186470
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.739 in44.17 mm N/A 0.003 in0.08 mm N/A -031 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
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
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
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
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
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
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.
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.
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.
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.
N/A
186469
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.864 in47.35 mm N/A 0.003 in0.08 mm N/A -032 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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.
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.
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.
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.
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.
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.
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