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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
BS31 S-70 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.
BS30 S-70 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.
BS29 S-70 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.
BS28 S-70 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.
BS27 S-70 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.
BS26 S-70 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.
BS25 S-70 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.
BS24 S-70 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.
BS23 S-70 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.
BS22 S-70 N/A
186479 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.989 in25.12 mm N/A 0.003 in0.08 mm N/A -022 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS21 S-70 N/A
186480 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.926 in23.52 mm N/A 0.003 in0.08 mm N/A -021 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS20 S-70 N/A
186481 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.864 in21.95 mm N/A 0.003 in0.08 mm N/A -020 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS19 S-70 N/A
186482 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.801 in20.35 mm N/A 0.003 in0.08 mm N/A -019 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS18 S-70 N/A
186483 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.739 in18.77 mm N/A 0.003 in0.08 mm N/A -018 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS17 S-70 N/A
186484 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.676 in17.17 mm N/A 0.003 in0.08 mm N/A -017 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS16 S-70 N/A
186485 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.614 in15.6 mm N/A 0.003 in0.08 mm N/A -016 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS15 S-70 N/A
186486 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.551 in14.00 mm N/A 0.003 in0.08 mm N/A -015 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS14 S-70 N/A
186487 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.489 in12.42 mm N/A 0.003 in0.08 mm N/A -014 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS13 S-70 N/A
186488 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.426 in10.82 mm N/A 0.003 in0.08 mm N/A -013 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS12 S-70 N/A
186489 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.364 in9.25 mm N/A 0.003 in0.08 mm N/A -012 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS11 S-70 N/A
186490 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.301 in7.65 mm N/A 0.003 in0.08 mm N/A -011 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS10 S-70 N/A
186491 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.239 in6.07 mm N/A 0.003 in0.08 mm N/A -010 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS9 S-70 N/A
186492 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.208 in5.28 mm N/A 0.003 in0.08 mm N/A -009 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS8 S-70 N/A
186493 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.176 in4.47 mm N/A 0.003 in0.08 mm N/A -008 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
BS7 S-70 N/A
186494 		N/A BS Standard O-Ring N/A Silicone N/A 0.070 in1.78 mm N/A 70 N/A 0.145 in3.68 mm N/A 0.003 in0.08 mm N/A -007 N/A N/A O-rings are used in the military, automotive, aerospace and agriculture industries.
Unit of Measure
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