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
186418
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.862 in47.29 mm N/A 0.003 in0.08 mm N/A -134 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186349
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.859 in47.22 mm N/A 0.004 in0.10 mm N/A -225 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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.
N/A
186084
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.813 in46.04 mm N/A 0.004 in0.10 mm N/A -828 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186419
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.799 in45.69 mm N/A 0.003 in0.08 mm N/A -133 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186085
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.75 in44.45 mm N/A 0.004 in0.10 mm N/A -827 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
186420
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.737 in44.12 mm N/A 0.003 in0.08 mm N/A -132 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186350
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.734 in44.04 mm N/A 0.004 in0.10 mm N/A -224 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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.
N/A
186086
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.687 in42.85 mm N/A 0.004 in0.10 mm N/A -826 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186421
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.674 in42.52 mm N/A 0.003 in0.08 mm N/A -131 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186087
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.625 in41.28 mm N/A 0.004 in0.10 mm N/A -825 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
186422
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.612 in40.94 mm N/A 0.003 in0.08 mm N/A -130 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186351
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.609 in40.87 mm N/A 0.004 in0.10 mm N/A -223 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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.
N/A
186088
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.563 in39.70 mm N/A 0.004 in0.10 mm N/A -824 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186153
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.553 in39.45 mm N/A 0.003 in0.08 mm N/A -519 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186423
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.549 in39.34 mm N/A 0.003 in0.08 mm N/A -129 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
186424
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.487 in37.77 mm N/A 0.003 in0.08 mm N/A -128 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186352
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.484 in37.69 mm N/A 0.004 in0.10 mm N/A -222 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.
N/A
186154
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.428 in36.27 mm N/A 0.003 in0.08 mm N/A -517 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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