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
186425
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.424 in36.17 mm N/A 0.003 in0.08 mm N/A -127 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186353
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.421 in36.09 mm N/A 0.004 in0.10 mm N/A -221 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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
186426
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.362 in34.59 mm N/A 0.003 in0.08 mm N/A -126 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186354
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.359 in34.52 mm N/A 0.004 in0.10 mm N/A -220 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
186474
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.301 in33.05 mm N/A 0.003 in0.08 mm N/A -027 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186427
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.299 in32.99 mm N/A 0.003 in0.08 mm N/A -125 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186355
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.296 in32.92 mm N/A 0.004 in0.10 mm N/A -219 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
186475
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.239 in31.47 mm N/A 0.003 in0.08 mm N/A -026 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186428
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.237 in31.42 mm N/A 0.003 in0.08 mm N/A -124 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186356
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.234 in31.34 mm N/A 0.004 in0.10 mm N/A -218 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
186476
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.176 in29.87 mm N/A 0.003 in0.08 mm N/A -025 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186429
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.174 in29.82 mm N/A 0.003 in0.08 mm N/A -123 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186357
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.171 in29.74 mm N/A 0.004 in0.10 mm N/A -217 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
186477
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.114 in28.30 mm N/A 0.003 in0.08 mm N/A -024 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186430
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.112 in28.24 mm N/A 0.003 in0.08 mm N/A -122 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186358
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.109 in28.17 mm N/A 0.004 in0.10 mm N/A -216 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
186478
N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 1.051 in26.70 mm N/A 0.003 in0.08 mm N/A -023 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186431
N/A BS Standard O-Ring N/A Silicone N/A 0.103 in2.62 mm N/A 70 N/A 1.049 in26.64 mm N/A 0.003 in0.08 mm N/A -121 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
N/A
186359
N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 1.046 in26.57 mm N/A 0.004 in0.10 mm N/A -215 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
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