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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.
BS O-Rings
Unit of Measure
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Item #

IntegrationID

Type

Material

Cross Section Width

Durometer

Inside Diameter

CSW Tolerance

BS Number

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O-Ring Industries

Quantity
BS279 S-70 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.
BS278 S-70 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.
BS277 S-70 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.
BS276 S-70 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.
BS275 S-70 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.
BS274 S-70 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.
BS273 S-70 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.
BS272 S-70 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.
BS271 S-70 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.
BS270 S-70 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.
BS269 S-70 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.
BS268 S-70 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.
BS267 S-70 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.
BS266 S-70 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.
BS265 S-70 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.
BS264 S-70 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.
BS263 S-70 N/A
186311 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 7.234 in183.74 mm N/A 0.004 in0.10 mm N/A -263 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS262 S-70 N/A
186312 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 6.984 in177.39 mm N/A 0.004 in0.10 mm N/A -262 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS261 S-70 N/A
186313 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 6.734 in171.04 mm N/A 0.004 in0.10 mm N/A -261 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS260 S-70 N/A
186314 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 6.484 in164.69 mm N/A 0.004 in0.10 mm N/A -260 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS259 S-70 N/A
186315 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 6.234 in158.34 mm N/A 0.004 in0.10 mm N/A -259 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS258 S-70 N/A
186316 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 5.984 in151.99 mm N/A 0.004 in0.10 mm N/A -258 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS257 S-70 N/A
186317 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 5.859 in148.82 mm N/A 0.004 in0.10 mm N/A -257 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS256 S-70 N/A
186318 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 5.734 in145.64 mm N/A 0.004 in0.10 mm N/A -256 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS255 S-70 N/A
186319 		N/A BS Standard O-Ring N/A Silicone N/A 0.139 in3.53 mm N/A 70 N/A 5.609 in142.47 mm N/A 0.004 in0.10 mm N/A -255 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
Unit of Measure
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