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Sheet Metal Gauge Chart

Convert sheet metal gauge numbers to thickness in inches and millimeters for mild steel, aluminum, and stainless steel.
Mild Steel
GaugeInchesMM
70.17934.55
80.16444.18
90.14953.80
100.13453.42
110.11963.04
120.10462.66
140.07471.90
160.05981.52
180.04781.21
200.03590.91
220.02990.76
240.02390.61
260.01790.45
280.01490.38
Aluminum
GaugeInchesMM
70.14433.67
80.12853.26
90.11442.91
100.10192.59
110.09072.31
120.08082.05
140.06411.63
160.05081.29
180.04031.02
200.03200.81
220.02540.64
240.02010.51
260.01590.41
280.01260.32
Stainless Steel
GaugeInchesMM
70.18744.76
80.17194.37
90.15633.97
100.14063.57
110.12503.18
120.10942.78
140.07811.98
160.06251.59
180.05001.27
200.03750.95
220.03130.79
240.02500.64
260.01880.48
280.01560.40

Learn more about gauge thickness: What is Sheet Metal Gauge?

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