Sheet Metal Gauge

These are theoretical gauge thickness. Actual thickness will vary depending on the mill it was rolled at, batch number, etc. Also, Please note that non-ferrous gauge (aluminum, copper, brass) are not the same as ferrous gauge (steel & stainless steel).

Sheet Metal Gauge	Non-Ferrous Brown and Sharpe Gauge	Non-Ferrous Brown and Sharpe Gauge	Non-Ferrous Brown and Sharpe Gauge	Steel Sheet	Steel Sheet	Strip & Tubing Birmingham or Stubs Gauge	Strip & Tubing Birmingham or Stubs Gauge
	lbs./Sq. ft. 1100,6061 Aluminum	Gauge Decimal (inches)	lbs./Sq. ft. Alloy 260 Brass	Gauge Decimal (inches)	lbs./Sq. ft. Steel Strip	Gauge Decimal (inches)	lbs./Sq. ft. Steel Strip
000000	–	.5800	–	–	–	–	–
00000	–	.5165	–	–	–	.500	20.40
0000	–	.4600	–	–	–	.454	18.52
000	–	.4096	–	–	–	.425	17.34
00	–	.3648	–	–	–	.380	15.50
0	–	.3249	–	–	–	.340	13.87
1	–	.2893	–	–	–	.300	12.24
2	–	.2576	–	–	–	.284	11.59
3	–	.2294	–	.2391	9.754	.259	10.57
4	–	.2043	–	.2242	9.146	.238	9.710
5	–	.1819	–	.2092	8.534	.220	8.975
6	2.286	.1620	7.185	.1943	7.926	.203	8.281
7	2.036	.1443	6.400	.1793	7.315	.180	7.343
8	1.813	.1285	5.699	.1644	6.707	.165	6.731
9	1.614	.1144	5.074	.1495	6.099	.148	6.038
10	1.438	.1019	4.520	.1345	5.487	.134	5.467
11	1.280	.0907	4.023	.1196	4.879	.120	4.895
12	1.140	.0808	3.584	.1046	4.267	.109	4.447
13	1.016	.0720	3.193	.0897	3.659	.095	3.876
14	.905	.0641	2.843	.0747	3.047	.083	3.386
15	.806	.0571	2.532	.0673	2.746	.072	2.937
16	.717	.0508	2.253	.0598	2.440	.065	2.652
17	.639	.0453	2.009	.0538	2.195	.058	2.366
18	.569	.0403	1.787	.0478	1.950	.049	1.999
19	.507	.0359	1.592	.0418	1.705	.042	1.713
20	.452	.0320	1.419	.0359	1.465	.035	1.428
21	.402	.0285	1.264	.0329	1.342	.032	1.305
22	.357	.0253	1.122	.0299	1.220	.028	1.142
23	.319	.0226	1.002	.0269	1.097	.025	1.020
24	.284	.0201	.892	.0239	.975	.022	.898
25	.253	.0179	.794	.0209	.853	.020	.816
26	.224	.0159	.705	.0179	.730	.018	.734
27	.200	.0142	.630	.0164	.669

Sheet Metal Gauge Size for Steel and Aluminium

Sheet Matal Gauge	Steel	Steel	Aluminium	Aluminium
–	(inches)	(mm)	(inches)	(mm)
3	.2391	6.073	.2294	5.827
4	.2242	5.695	.2043	5.189
5	.2092	5.314	.1819	4.620
6	.1943	4.935	.1620	4.115
7	.1793	4.554	.1443	3.665
8	.1644	4.176	.1285	3.264
9	.1495	3.797	.1144	2.906
10	.1345	3.416	.1019	2.588
11	.1196	3.030	.0907	2.304
12	.1046	2.657	.0808	2.052
13	.0897	2.278	.0720	1.829
14	.0747	1.897	.0641	1.628
15	.0673	1.709	.0571	1.450
16	.0598	1.519	.0508	1.290
17	.0538	1.367	.0453	1.151
18	.0478	1.214	.0403	1.024
19	.0418	1.062	.0359	0.912
20	.0359	0.912	.0320	0.813
21	.0329	0.836	.0285	0.724
22	.0299	0.759	.0253	0.643
23	.0269	0.683	.0226	0.574
24	.0239	0.607	.0201	0.511
25	.0209	0.531	.0179	0.455
26	.0179	0.455	.0159	0.404
27	.0164	0.417	.0142	0.361
28	.0149	0.378	.0126	0.320
29	.0135	0.343	.0113	0.287
30	.0120	0.305	.0100	0.254
31	.0105	0.267	.0089	0.226
32	.0097	0.246	.0080	0.203
33	.0090	0.229	.0071	0.180
34	.0082	0.208	.0063	0.160
35	.0075	0.191	.0056	0.142

Sheet Metal Gauge for Steel, Galvanized Steel,Stainless Steel, Alumium, Zinc

Sheet Metal Gauge	Steel in (mm)	Galvanized Steel in (mm)	Stainless Steel in (mm)	Aluminum in (mm)	Zinc in (mm)
3	0.2391 (6.07)	–	–	–	0.006 (0.15)
4	0.2242 (5.69)	–	–	–	0.008 (0.20)
5	0.2092 (5.31)	–	–	–	0.010 (0.25)
6	0.1943 (4.94)	–	–	0.162 (4.1)	0.012 (0.30)
7	0.1793 (4.55)	–	0.1875 (4.76)	0.1443 (3.67)	0.014 (0.36)
8	0.1644 (4.18)	0.1681 (4.27)	0.1719 (4.37)	0.1285 (3.26)	0.016 (0.41)
9	0.1495 (3.80)	0.1532 (3.89)	0.1563 (3.97)	0.1144 (2.91)	0.018 (0.46)
10	0.1345 (3.42)	0.1382 (3.51)	0.1406 (3.57)	0.1019 (2.59)	0.020 (0.51)
11	0.1196 (3.04)	0.1233 (3.13)	0.1250 (3.18)	0.0907 (2.30)	0.024 (0.61)
12	0.1046 (2.66)	0.1084 (2.75)	0.1094 (2.78)	0.0808 (2.05)	0.028 (0.71)
13	0.0897 (2.28)	0.0934 (2.37)	0.094 (2.4)	0.072 (1.8)	0.032 (0.81)
14	0.0747 (1.90)	0.0785 (1.99)	0.0781 (1.98)	0.0641 (1.63)	0.036 (0.91)
15	0.0673 (1.71)	0.0710 (1.80)	0.07 (1.8)	0.057 (1.4)	0.040 (1.0)
16	0.0598 (1.52)	0.0635 (1.61)	0.0625 (1.59)	0.0508 (1.29)	0.045 (1.1)
17	0.0538 (1.37)	0.0575 (1.46)	0.056 (1.4)	0.045 (1.1)	0.050 (1.3)
18	0.0478 (1.21)	0.0516 (1.31)	0.0500 (1.27)	0.0403 (1.02)	0.055 (1.4)
19	0.0418 (1.06)	0.0456 (1.16)	0.044 (1.1)	0.036 (0.91)	0.060 (1.5)
20	0.0359 (0.91)	0.0396 (1.01)	0.0375 (0.95)	0.0320 (0.81)	0.070 (1.8)
21	0.0329 (0.84)	0.0366 (0.93)	0.034 (0.86)	0.028 (0.71)	0.080 (2.0)
22	0.0299 (0.76)	0.0336 (0.85)	0.031 (0.79)	0.025 (0.64)	0.090 (2.3)
23	0.0269 (0.68)	0.0306 (0.78)	0.028 (0.71)	0.023 (0.58)	0.100 (2.5)
24	0.0239 (0.61)	0.0276 (0.70)	0.025 (0.64)	0.02 (0.51)	0.125 (3.2)
25	0.0209 (0.53)	0.0247 (0.63)	0.022 (0.56)	0.018 (0.46)	–
26	0.0179 (0.45)	0.0217 (0.55)	0.019 (0.48)	0.017 (0.43)	–
27	0.0164 (0.42)	0.0202 (0.51)	0.017 (0.43)	0.014 (0.36)	–
28	0.0149 (0.38)	0.0187 (0.47)	0.016 (0.41)	0.0126 (0.32)	–
29	0.0135 (0.34)	0.0172 (0.44)	0.014 (0.36)	0.0113 (0.29)	–
30	0.0120 (0.30)	0.0157 (0.40)	0.013 (0.33)	0.0100 (0.25)	–
31	0.0105 (0.27)	0.0142 (0.36)	0.011 (0.28)	0.0089 (0.23)	–
32	0.0097 (0.25)	–	–	–	–
33	0.0090 (0.23)	–	–	–	–
34	0.0082 (0.21)	–	–	–	–
35	0.0075 (0.19)	–	–	–	–
36	0.0067 (0.17)	–	–	–	–
37	0.0064 (0.16)	–	–	–	–
38	0.0060 (0.15)	–	–	–	–

Steel Sheet Metal Tolerances

Sheet Metal Gauge	Nominal [in]	Maximum [in]	Minimum [in]
10	0.1345	0.1405	0.1285
11	0.1196	0.1256	0.1136
12	0.1046	0.1106	0.0986
14	0.0747	0.0797	0.0697
16	0.0598	0.0648	0.0548
18	0.0478	0.0518	0.0438
20	0.0359	0.0389	0.0329
22	0.0299	0.0329	0.0269
24	0.0239	0.0269	0.0209
26	0.0179	0.0199	0.0159
28	0.0149	0.0169	0.0129

Aluminum Sheet Metal Tolerances

Thickness [in]	Aluminum Sheet width	Aluminum Sheet width
–	36 in [in]	48 in [in]
0.018±0.028	0.002	0.0025
0.029 ±0.036	0.002	0.0025
0.037±0.045	0.0025	0.003
0.046±0.068	0.003	0.004
0.069±0.076	0.003	0.004
0.077±0.096	0.0035	0.004
0.097±0.108	0.004	0.005
0.109±0.125	0.0045	0.005
0.126±0.140	0.0045	0.005
0.141±0.172	0.006	0.008
0.173±0.203	0.007	0.010
0.204±0.249	0.009	0.011

Stainless Steel Sheet Tolerances

Thickness [in]	Stainless Steel Sheet width	Stainless Steel Sheet width
–	36 in [in]	48 in [in]
0.017±0.030	0.0015	0.002
0.031±0.041	0.002	0.003
0.042±0.059	0.003	0.004
0.060±0.073	0.003	0.0045
0.074±0.084	0.004	0.0055
0.085±0.099	0.004	0.006
0.100±0.115	0.005	0.007
0.116±0.131	0.005	0.0075
0.132±0.146	0.006	0.009
0.147±0.187	0.007	0.0105