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
186406
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.612 in66.34 mm N/A 0.003 in0.08 mm N/A -146 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186463
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 2.614 in66.40 mm N/A 0.003 in0.08 mm N/A -038 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186071
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.625 in66.68 mm N/A 0.004 in0.10 mm N/A -841 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186405
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.675 in67.95 mm N/A 0.003 in0.08 mm N/A -147 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186070
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.687 in68.25 mm N/A 0.004 in0.10 mm N/A -842 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186266
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 2.725 in69.22 mm N/A 0.005 in0.13 mm N/A -335 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186342
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.734 in69.44 mm N/A 0.004 in0.10 mm N/A -232 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186404
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.737 in69.52 mm N/A 0.003 in0.08 mm N/A -148 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186462
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 2.739 in69.57 mm N/A 0.003 in0.08 mm N/A -039 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186069
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.75 in69.85 mm N/A 0.004 in0.10 mm N/A -843 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186403
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.800 in71.12 mm N/A 0.003 in0.08 mm N/A -149 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186068
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.813 in71.44 mm N/A 0.004 in0.10 mm N/A -844 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186265
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 2.850 in72.39 mm N/A 0.005 in0.13 mm N/A -336 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186341
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.859 in72.62 mm N/A 0.004 in0.10 mm N/A -233 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186402
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.862 in72.69 mm N/A 0.003 in0.08 mm N/A -150 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186461
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 2.864 in72.75 mm N/A 0.003 in0.08 mm N/A -040 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186067
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.875 in73.03 mm N/A 0.004 in0.10 mm N/A -845 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186110
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.924 in74.27 mm N/A 0.003 in0.08 mm N/A -640 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186066
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.937 in74.60 mm N/A 0.004 in0.10 mm N/A -846 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186120
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 2.938 in74.61 mm N/A 0.005 in0.13 mm N/A -619 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186264
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 2.975 in75.57 mm N/A 0.005 in0.13 mm N/A -337 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186340
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 2.984 in75.79 mm N/A 0.004 in0.10 mm N/A -234 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186401
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 2.987 in75.87 mm N/A 0.003 in0.08 mm N/A -151 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186460
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 2.989 in75.92 mm N/A 0.003 in0.08 mm N/A -041 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186211
N/A BS Standard O-Ring N/A Silicone N/A 0.210 in5.33 mm N/A 70 N/A 20.955 in532.26 mm N/A 0.005 in0.13 mm N/A -390 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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