Sheet Steel Gauge Size Chart

By: Leon Rhodes

Sheet steel thickness is displayed by standardized gauge. The lower the gauge number of a sheet of steel the thicker the sheet steel is. Conversely, the higher the gauge of sheet steel the thinner it is. The gauge measurement system used with sheet steel is called the Manufacturer's Standard Gage.

Sheet Steel Gauge Size Chart

The thickness represented by each gauge varies slightly between standard, galvanized and stainless sheet steel. Use the appropriate gauge size conversion chart below for the sheet metal type you are measuring.

Standard Sheet Steel Size Chart

Gauge Standard Thickness Metric Thickness
30.2391 inches6.073 mm
40.2242 inches5.695 mm
50.2092 inches5.314 mm
60.1943 inches4.935 mm
70.1793 inches4.554 mm
80.1644 inches4.176 mm
90.1495 inches3.797 mm
100.1345 inches3.416 mm
110.1196 inches3.038 mm
120.1046 inches2.657 mm
130.0897 inches2.278 mm
140.0747 inches1.897 mm
150.0673 inches1.709 mm
160.0598 inches1.519 mm
170.0538 inches1.367 mm
180.0478 inches1.214 mm
190.0418 inches1.062 mm
200.0359 inches0.912 mm
210.0329 inches0.836 mm
220.0299 inches0.759 mm
230.0269 inches0.683 mm
240.0239 inches0.607 mm
250.0209 inches0.531 mm
260.0179 inches0.455 mm
270.0164 inches0.417 mm
280.0149 inches0.378 mm
290.0135 inches0.343 mm
300.0120 inches0.305 mm
310.0105 inches0.267 mm
320.0097 inches0.246 mm
330.0090 inches0.229 mm
340.0082 inches0.208 mm
350.0075 inches0.191 mm
360.0067 inches0.170 mm
370.0064 inches0.163 mm
380.0060 inches0.152 mm

Galvanized Sheet Steel Size Chart

Galvanized sheet steel is slightly thicker per gauge than standard sheet steel due to the galvanization process. Galvanized sheet steel has a rust inhibiting protective coating which makes it slightly thicker than standard(unprotected) sheet steel.

Gauge Standard Thickness Metric Thickness
80.1681 inches4.270 mm
90.1532 inches3.891 mm
100.1382 inches3.510 mm
110.1233 inches3.132 mm
120.1084 inches2.753 mm
130.0934 inches2.372 mm
140.0785 inches1.994 mm
150.0710 inches1.803 mm
160.0635 inches1.613 mm
170.0575 inches1.461 mm
180.0516 inches1.311 mm
190.0456 inches1.158 mm
200.0396 inches1.006 mm
210.0366 inches0.930 mm
220.0336 inches0.853 mm
230.0306 inches0.777 mm
240.0276 inches0.701 mm
250.0247 inches0.627 mm
260.0217 inches0.551 mm
270.0202 inches0.513 mm
280.0187 inches0.475 mm
290.0172 inches0.437 mm
300.0157 inches0.399 mm
310.0142 inches0.361 mm
320.0134 inches0.340 mm

Stainless Sheet Steel Size Chart

This is the size chart for stainless sheet steel. Stainless sheet steel is made from an iron alloy containing at least 11% chromium to prevent corrosion. Stainless sheet steel is more durable than standard and galvanized sheet steel but is slightly thicker per gauge.

Gauge Standard Thickness Metric Thickness
00.3125 inches7.938 mm
10.2813 inches7.145 mm
20.2656 inches6.746 mm
30.2500 inches6.350 mm
40.2344 inches5.954 mm
50.2187 inches5.555 mm
60.2031 inches5.159 mm
70.1875 inches4.763 mm
80.1719 inches4.366 mm
90.1562 inches3.967 mm
100.1406 inches3.571 mm
110.1250 inches3.175 mm
120.1094 inches2.779 mm
130.0937 inches2.380 mm
140.0781 inches1.984 mm
150.0703 inches1.786 mm
160.0625 inches1.588 mm
170.0562 inches1.427 mm
180.0500 inches1.270 mm
190.0437 inches1.110 mm
200.0375 inches0.953 mm
210.0344 inches0.874 mm
220.0312 inches0.792 mm
230.0281 inches0.714 mm
240.0250 inches0.635 mm
250.0219 inches0.556 mm
260.0187 inches0.475 mm
270.0172 inches0.437 mm
280.0156 inches0.396 mm
290.0141 inches0.358 mm
300.0125 inches0.318 mm
310.0109 inches0.277 mm
320.0102 inches0.259 mm
330.0094 inches0.239 mm
340.0086 inches0.218 mm
350.0078 inches0.198 mm
360.0070 inches0.178 mm
370.0066 inches0.168 mm
380.0062 inches0.157 mm

The gauge thickness differences between the three types of sheet steel are small but not insignificant for many applications.

Sheet Steel Use in Automotive Applications

Sheet steel is used by automotive manufacturers to make panels for components, such as doors, hoods and floors, for new vehicles. Consumers and auto body shops typically use sheet steel to repair damage and/or patch corrosion on used vehicles.

Standard sheet steel is often considered the best option for repairs primarily because of the cost differences between metal types, which are not insignificant. A good piece of standard sheet steel can be protected with paints and other corrosion-inhibiting fluids which, for cars and trucks, lowers the overall cost of repairs.

Rusted panels can be repaired using sheet metal cut from other used vehicles in order to keep costs to a minimum, however, sheet steel should not be used to repair structural components like frames and door pillars for safety reasons.

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