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BS1806 Metric Size Chart

The BS 1806 O-Rings 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. Although still commonly used, the BS1806 has been superseded by ISO 3601 standard.

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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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