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. EP is also known as: Eythylene Propylene, EPR, EPDM, EPT, E.

EP is an elastomer which is characterized by wide range of applications and good chemical resistance. Ethylene propylene compounds have good resistance to detergents, alkalis, mild acids, greases, silicone oils, and alcohols.

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Inside Diamter (in)

Inside Diamter (mm)

Cross Section Width (in)

Cross Section Width (mm)

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Inside Diamter

Cross Section Width

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BS2 EP-70 N/A 0.042 in1.07 mm N/A 0.050 in1.27 mm N/A 70 N/A 0.003 in0.08 mm N/A -002
BS3 EP-70 N/A 0.056 in1.42 mm N/A 0.060 in1.52 mm N/A 70 N/A 0.003 in0.08 mm N/A -003
BS4 EP-70 N/A 0.070 in1.78 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -004
BS5 EP-70 N/A 0.101 in2.57 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -005
BS6 EP-70 N/A 0.114 in2.90 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -006
BS7 EP-70 N/A 0.145 in3.68 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -007
BS8 EP-70 N/A 0.176 in4.47 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -008
BS9 EP-70 N/A 0.208 in5.28 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -009
BS10 EP-70 N/A 0.239 in6.07 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -010
BS11 EP-70 N/A 0.301 in7.65 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -011
BS12 EP-70 N/A 0.364 in9.25 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -012
BS13 EP-70 N/A 0.426 in10.82 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -013
BS14 EP-70 N/A 0.489 in12.42 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -014
BS15 EP-70 N/A 0.551 in14.00 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -015
BS16 EP-70 N/A 0.614 in15.6 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -016
BS17 EP-70 N/A 0.676 in17.17 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -017
BS18 EP-70 N/A 0.739 in18.77 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -018
BS19 EP-70 N/A 0.801 in20.35 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -019
BS20 EP-70 N/A 0.864 in21.95 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -020
BS21 EP-70 N/A 0.926 in23.52 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -021
BS22 EP-70 N/A 0.989 in25.12 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -022
BS23 EP-70 N/A 1.051 in26.70 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -023
BS24 EP-70 N/A 1.114 in28.30 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -024
BS25 EP-70 N/A 1.176 in29.87 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -025
BS26 EP-70 N/A 1.239 in31.47 mm N/A 0.070 in1.78 mm N/A 70 N/A 0.003 in0.08 mm N/A -026
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