MESteel
Cold rolled coils & sheets · Size & tolerance table

Sheet metal gauges to millimetres

Standard: US Manufacturers’ Standard Gauge · galvanized sheet gauge · AWG (Brown & Sharpe) · BS SWG · BWG

A gauge number means a different thickness depending on the material and the gauge system, and the gauge goes up as the sheet gets thinner. Steel sheet in North America is still often quoted in the Manufacturers’ Standard Gauge (MSG); galvanized sheet has its own gauge, about 0.09 mm thicker for the same number because it includes the zinc; aluminium sheet is quoted in the American Wire Gauge (Brown & Sharpe). Older British specifications use the Standard Wire Gauge (SWG) or the Birmingham gauges.

Gauges are a convention, not a tolerance: international trade in the Middle East is in millimetres, and an order should state the thickness in mm (and for coated sheet whether it is base metal or total coated thickness).

Gauge number to thickness

Gauge Steel sheet (MSG) Galvanized steel Aluminium (AWG) SWG BWG
Gauge no. in mm in mm in mm mm mm
8 0.1644 4.176 0.1681 4.270 0.1285 3.264 4.064 4.191
9 0.1495 3.797 0.1532 3.891 0.1144 2.906 3.658 3.759
10 0.1345 3.416 0.1382 3.510 0.1019 2.588 3.251 3.404
11 0.1196 3.038 0.1233 3.132 0.0907 2.305 2.946 3.048
12 0.1046 2.657 0.1084 2.753 0.0808 2.053 2.642 2.769
13 0.0897 2.278 0.0934 2.372 0.0720 1.828 2.337 2.413
14 0.0747 1.897 0.0785 1.994 0.0641 1.628 2.032 2.108
15 0.0673 1.709 0.0710 1.803 0.0571 1.450 1.829 1.829
16 0.0598 1.519 0.0635 1.613 0.0508 1.291 1.626 1.651
17 0.0538 1.367 0.0575 1.461 0.0453 1.150 1.422 1.473
18 0.0478 1.214 0.0516 1.311 0.0403 1.024 1.219 1.245
19 0.0418 1.062 0.0456 1.158 0.0359 0.912 1.016 1.067
20 0.0359 0.912 0.0396 1.006 0.0320 0.812 0.914 0.889
21 0.0329 0.836 0.0366 0.930 0.0285 0.723 0.813 0.813
22 0.0299 0.759 0.0336 0.853 0.0253 0.644 0.711 0.711
23 0.0269 0.683 0.0306 0.777 0.0226 0.573 0.610 0.635
24 0.0239 0.607 0.0276 0.701 0.0201 0.511 0.559 0.559
25 0.0209 0.531 0.0247 0.627 0.0179 0.455 0.508 0.508
26 0.0179 0.455 0.0217 0.551 0.0159 0.405 0.457 0.457
27 0.0164 0.417 0.0202 0.513 0.0142 0.361 0.417 0.406
28 0.0149 0.378 0.0187 0.475 0.0126 0.321 0.376 0.356
29 0.0135 0.343 0.0172 0.437 0.0113 0.286 0.345 0.330
30 0.0120 0.305 0.0157 0.399 0.0100 0.255 0.315 0.305

Birmingham Gauge (BG) for sheet

Gauge no. BG in BG mm
10 0.1250 3.18
12 0.0991 2.52
14 0.0785 1.99
16 0.0625 1.59
18 0.0495 1.26
20 0.0392 1.00
22 0.0313 0.80
24 0.0248 0.63
26 0.0196 0.50
28 0.0156 0.40

Notes

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