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Birmingham Sheet Metal Gauge (B.G.)

This is a numbering system for sheet metal gauge (thickness).

No.	Size inches	No.	Size inches	No.	Size inches	No.	Size inches
7/0	0.6666	9	0.1398	24	0.0247	39	0.0043
6/0	0.625	10	0.125	25	0.022	40	0.0038
5/0	0.5883	11	0.1113	26	0.0196	41	0.0034
4/0	0.5416	12	0.0991	27	0.0174	42	0.0030
3/0	0.500	13	0.0882	28	0.0156	43	0.0027
2/0	0.4452	14	0.0785	29	0.0139	44	0.0024
0	0.3964	15	0.0699	30	0.0123	45	0.0021
1	0.3532	16	0.0625	31	0.011	46	0.0019
2	0.3147	17	0.0556	32	0.0098	47	0.0017
3	0.2804	18	0.0495	33	0.0087	48	0.0016
4	0.250	19	0.044	34	0.0077	49	0.0013
5	0.2225	20	0.0392	35	0.0069	50	0.0012
6	0.1981	21	0.0349	36	0.0061
7	0.1764	22	0.0312	37	0.0054
8	0.1570	23	0.0278	38	0.0048

See also: Standard Wire Gauge.

Subjects: Mechanical Engineering