Sheet Metal Gauges

The below table summarizes sheet metal gauge and tolerances. Monroe, nor any of its employees shall be held liable for any improper or incorrect use of the information described and/or contained herein and assumes no responsibility for anyone's use of the information.

Standard sheet metal gauges

Gauge U.S. standard
for sheet and plate
iron and steel
decimal inch (mm)		 Steel
inch (mm)		 Galvanized steel
inch (mm)		 Stainless steel
inch (mm)		 Aluminium
inch (mm)		 Zinc
inch (mm)
0000000 0.5000 (12.70) ...... ...... ...... ...... ......
000000 0.4688 (11.91) ...... ...... ...... ...... ......
00000 0.4375 (11.11) ...... ...... ...... ...... ......
0000 0.4063 (10.32) ...... ...... ...... ...... ......
000 0.3750 (9.53) ...... ...... ...... ...... ......
00 0.3438 (8.73) ...... ...... ...... ...... ......
0 0.3125 (7.94) ...... ...... ...... ...... ......
1 0.2813 (7.15) ...... ...... ...... ...... ......
2 0.2656 (6.75) ...... ...... ...... ...... ......
3 0.2500 (6.35) 0.2391 (6.07) ...... ...... ...... 0.006 (0.15)
4 0.2344 (5.95) 0.2242 (5.69) ...... ...... ...... 0.008 (0.20)
5 0.2188 (5.56) 0.2092 (5.31) ...... ...... ...... 0.010 (0.25)
6 0.2031 (5.16) 0.1943 (4.94) ...... ...... 0.162 (4.1) 0.012 (0.30)
7 0.1875 (4.76) 0.1793 (4.55) ...... 0.1875 (4.76) 0.1443 (3.67) 0.014 (0.36)
8 0.1719 (4.37) 0.1644 (4.18) 0.1681 (4.27) 0.1719 (4.37) 0.1285 (3.26) 0.016 (0.41)
9 0.1563 (3.97) 0.1495 (3.80) 0.1532 (3.89) 0.1563 (3.97) 0.1144 (2.91) 0.018 (0.46)
10 0.1406 (3.57) 0.1345 (3.42) 0.1382 (3.51) 0.1406 (3.57) 0.1019 (2.59) 0.020 (0.51)
11 0.1250 (3.18) 0.1196 (3.04) 0.1233 (3.13) 0.1250 (3.18) 0.0907 (2.30) 0.024 (0.61)
12 0.1094 (2.78) 0.1046 (2.66) 0.1084 (2.75) 0.1094 (2.78) 0.0808 (2.05) 0.028 (0.71)
13 0.0938 (2.38) 0.0897 (2.28) 0.0934 (2.37) 0.094 (2.4) 0.072 (1.8) 0.032 (0.81)
14 0.0781 (1.98) 0.0747 (1.90) 0.0785 (1.99) 0.0781 (1.98) 0.0641 (1.63) 0.036 (0.91)
15 0.0703 (1.79) 0.0673 (1.71) 0.0710 (1.80) 0.07 (1.8) 0.057 (1.4) 0.040 (1.0)
16 0.0625 (1.59) 0.0598 (1.52) 0.0635 (1.61) 0.0595 (1.51) 0.0508 (1.29) 0.045 (1.1)
17 0.0563 (1.43) 0.0538 (1.37) 0.0575 (1.46) 0.056 (1.4) 0.045 (1.1) 0.050 (1.3)
18 0.0500 (1.27) 0.0478 (1.21) 0.0516 (1.31) 0.0500 (1.27) 0.0403 (1.02) 0.055 (1.4)
19 0.0438 (1.11) 0.0418 (1.06) 0.0456 (1.16) 0.044 (1.1) 0.036 (0.91) 0.060 (1.5)
20 0.0375 (0.95) 0.0359 (0.91) 0.0396 (1.01) 0.0375 (0.95) 0.0320 (0.81) 0.070 (1.8)
21 0.0344 (0.87) 0.0329 (0.84) 0.0366 (0.93) 0.034 (0.86) 0.028 (0.71) 0.080 (2.0)
22 0.0313 (0.80) 0.0299 (0.76) 0.0336 (0.85) 0.031 (0.79) 0.025 (0.64) 0.090 (2.3)
23 0.0281 (0.71) 0.0269 (0.68) 0.0306 (0.78) 0.028 (0.71) 0.023 (0.58) 0.100 (2.5)
24 0.0250 (0.64) 0.0239 (0.61) 0.0276 (0.70) 0.025 (0.64) 0.02 (0.51) 0.125 (3.2)
25 0.0219 (0.56) 0.0209 (0.53) 0.0247 (0.63) 0.022 (0.56) 0.018 (0.46) ......
26 0.0188 (0.48) 0.0179 (0.45) 0.0217 (0.55) 0.019 (0.48) 0.017 (0.43) ......
27 0.0172 (0.44) 0.0164 (0.42) 0.0202 (0.51) 0.017 (0.43) 0.014 (0.36) ......
28 0.0156 (0.40) 0.0149 (0.38) 0.0187 (0.47) 0.016 (0.41) 0.0126 (0.32) ......
29 0.0141 (0.36) 0.0135 (0.34) 0.0172 (0.44) 0.014 (0.36) 0.0113 (0.29) ......
30 0.0125 (0.32) 0.0120 (0.30) 0.0157 (0.40) 0.013 (0.33) 0.0100 (0.25) ......
31 0.0109 (0.28) 0.0105 (0.27) 0.0142 (0.36) 0.011 (0.28) 0.0089 (0.23) ......
32 0.0102 (0.26) 0.0097 (0.25) ...... ...... ...... ......
33 0.0094 (0.24) 0.0090 (0.23) ...... ...... ...... ......
34 0.0086 (0.22) 0.0082 (0.21) ...... ...... ...... ......
35 0.0078 (0.20) 0.0075 (0.19) ...... ...... ...... ......
36 0.0070 (0.18) 0.0067 (0.17) ...... ...... ...... ......
37 0.0066 (0.17) 0.0064 (0.16) ...... ...... ...... ......
38 0.0063 (0.16) 0.0060 (0.15) ...... ...... ...... ......

Steel sheet metal tolerances

Gauge Nominal
[in (mm)]		 Max
[in (mm)]		 Min
[in (mm)]
10 0.1345 (3.42) 0.1405 (3.57) 0.1285 (3.26)
11 0.1196 (3.04) 0.1256 (3.19) 0.1136 (2.89)
12 0.1046 (2.66) 0.1106 (2.81) 0.0986 (2.50)
14 0.0747 (1.90) 0.0797 (2.02) 0.0697 (1.77)
16 0.0598 (1.52) 0.0648 (1.65) 0.0548 (1.39)
18 0.0478 (1.21) 0.0518 (1.32) 0.0438 (1.11)
20 0.0359 (0.91) 0.0389 (0.99) 0.0329 (0.84)
22 0.0299 (0.76) 0.0329 (0.84) 0.0269 (0.68)
24 0.0239 (0.61) 0.0269 (0.68) 0.0209 (0.53)
26 0.0179 (0.45) 0.0199 (0.51) 0.0159 (0.40)
28 0.0149 (0.38) 0.0169 (0.43) 0.0129 (0.33)

Aluminium sheet metal tolerances

Thickness
[in (mm)]		 Sheet width
36 (914.4)
[in (mm)]		 48 (1,219)
[in (mm)]
0.018–0.028 (0.46–0.71) 0.002 (0.051) 0.0025 (0.064)
0.029–0.036 (0.74–0.91) 0.002 (0.051) 0.0025 (0.064)
0.037–0.045 (0.94–1.14) 0.0025 (0.064) 0.003 (0.076)
0.046–0.068 (1.2–1.7) 0.003 (0.076) 0.004 (0.10)
0.069–0.076 (1.8–1.9) 0.003 (0.076) 0.004 (0.10)
0.077–0.096 (2.0–2.4) 0.0035 (0.089) 0.004 (0.10)
0.097–0.108 (2.5–2.7) 0.004 (0.10) 0.005 (0.13)
0.109–0.125 (2.8–3.2) 0.0045 (0.11) 0.005 (0.13)
0.126–0.140 (3.2–3.6) 0.0045 (0.11) 0.005 (0.13)
0.141–0.172 (3.6–4.4) 0.006 (0.15) 0.008 (0.20)
0.173–0.203 (4.4–5.2) 0.007 (0.18) 0.010 (0.25)
0.204–0.249 (5.2–6.3) 0.009 (0.23) 0.011 (0.28)

Stainless steel sheet metal tolerances

Thickness
[in (mm)]		 Sheet width
36 (914.4)
[in (mm)]		 48 (1,219)
[in (mm)]
0.017–0.030 (0.43–0.76) 0.0015 (0.038) 0.002 (0.051)
0.031–0.041 (0.79–1.04) 0.002 (0.051) 0.003 (0.076)
0.042–0.059 (1.1–1.5) 0.003 (0.076) 0.004 (0.10)
0.060–0.073 (1.5–1.9) 0.003 (0.076) 0.0045 (0.11)
0.074–0.084 (1.9–2.1) 0.004 (0.10) 0.0055 (0.14)
0.085–0.099 (2.2–2.5) 0.004 (0.10) 0.006 (0.15)
0.100–0.115 (2.5–2.9) 0.005 (0.13) 0.007 (0.18)
0.116–0.131 (2.9–3.3) 0.005 (0.13) 0.0075 (0.19)
0.132–0.146 (3.4–3.7) 0.006 (0.15) 0.009 (0.23)
0.147–0.187 (3.7–4.7) 0.007 (0.18) 0.0105 (0.27)

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