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Steel Thickness versus Gauge

Sheet Steel Thicknesses vs Gauge No.

Old Gauge Minimum Thickness Nominal Thickness Marking
Gauge no. in. mm. in.
12 0.0946 2.4 2.4
16 0.0533 1.35 1.4
18 0.0428 1.09 1.1
19 0.0378 0.96 1
20 0.0324 0.823 0.8
22 0.0269 0.683 0.7
24 0.0209 0.531 0.5
26 0.0159 0.404 0.4
28 0.0129 0.328 0.3
29 0.0115 0.292 0.3

Sheet steel thickness is measured at any point no less than V8 in. (9.53 mm) from the edge. New DOT regulations that went into effect for new packaging manufacturers on Oct. 1, 1994 no longer refer to steel thicknesses in gauges but rather in millimeters. Below is a similar chart from a different source.

MetalĀ ThicknessĀ conversion chart

Conventional Gauge Inches Metric
24 .020 -.026" 0.5 - 0.6 mm
22 .027 - .032" 0.7 - 0.8 mm
20 .033 - .037" 0.8 - 0.9 mm
19 .038 - .042" 0.9 - 1.1 mm
18 .043 - .048" 1.1 - 1.2 mm
16 .053 - .059" 1.3 - 1.5 mm
12 .094 -.106" 2.4 - 2.7 mm

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