BS1806 Metric Size Chart

The BS 1806 O-Ring size guide was issued by the British Standards Institution and this lists all imperial standard sizes. This standard includes the 5 main cross section groups in AS568 plus several sizes that are between AS568 sizes. 

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BS 1806 Size Chart

Part Number
Reference
C/S mm
ID mm
C/S inch
ID inch
1.02X000.74
-1
1.02
0.74
0.04
0.029
1.02X001.78
-606
1.02
1.78
0.04
0.07
1.02X002.54
-607
1.02
2.54
0.04
0.1
1.27X001.07
-2
1.27
1.07
0.05
0.042
1.52X001.42
-3
1.52
1.42
0.06
0.056
1.63X006.07
-902
1.63
6.07
0.064
0.239
1.63X007.65
-903
1.63
7.65
0.064
0.301
1.78X001.78
-4
1.78
1.78
0.07
0.07
1.78X002.57
-5
1.78
2.57
0.07
0.101
1.78X002.9
-6
1.78
2.9
0.07
0.114
1.78X003.18
-801
1.78
3.18
0.07
0.125
1.78X003.68
-7
1.78
3.68
0.07
0.145
1.78X004.47
-8
1.78
4.47
0.07
0.176
1.78X004.75
-802
1.78
4.75
0.07
0.187
1.78X005.28
-9
1.78
5.28
0.07
0.208
1.78X006.07
-10
1.78
6.07
0.07
0.239
1.78X006.35
-803
1.78
6.35
0.07
0.25
1.78X006.76
-610
1.78
6.76
0.07
0.266
1.78X007.65
-11
1.78
7.65
0.07
0.301
1.78X007.94
-804
1.78
7.94
0.07
0.313
1.78X008.74
-611
1.78
8.74
0.07
0.344
1.78X009.25
-12
1.78
9.25
0.07
0.364
1.78X010.82
-13
1.78
10.82
0.07
0.426
1.78X011.1
-806
1.78
11.1
0.07
0.437
1.78X012.42
-14
1.78
12.42
0.07
0.489
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