Gauge Sheet Metal Chart

July 14, 2023
Sheet Metal Gauge Chart

When dealing with sheet metal, it is frequently referred to using the term “gauge.” Individuals who are unfamiliar with this gauge system may not grasp the significance of terms like “18 gauge steel.” To provide assistance, this blog post will elucidate the gauge system and include a comprehensive sheet metal gauge chart.

The gauge system is utilized to measure the thickness of sheet metal, expressed in terms of gauge numbers. For instance, if someone mentions “16 gauge thickness in mm,” they are referring to the thickness of the sheet metal measured in millimeters.

Understanding the gauge system is crucial when working with sheet metal. It allows you to determine the appropriate thickness for a particular application. Different gauge numbers correspond to varying thicknesses, with smaller gauge numbers indicating thicker sheets.

To convert gauge measurements to millimeters, you can use the “sheet metal gauge to mm” conversion. This conversion provides a convenient way to understand the precise thickness of a sheet based on its gauge.

A gauge sheet metal serves as a valuable reference tool. It visually presents the gauge numbers alongside their corresponding thicknesses in both gauge and millimeters. This chart simplifies the process of selecting the appropriate gauge for a specific project, ensuring the desired outcome and structural integrity.

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    How are Sheet Metal Gauges Used?

    Gauges are employed to indicate the sheet metal thickness. These gauges are not standardized nor aligned with the metric system, and their values exist independently of these measurement systems. To accurately determine the gauges of steel thickness in inches or millimeters, one can refer to a gauge conversion chart. For instance, referring to such a chart, 18 gauge steel measures 0.0478 inch or 1.214 millimeters. It’s important to note that the gauge number, in this case, “18,” does not directly correspond to the actual measurements.

    Today, various gauge systems are in use, each with specific gauge designations tailored to different types of metals. For example, in one gauge system, 18 gauge steel has a thickness of 0.0478 inches, while 18 gauge aluminum measures 0.0403 inches. These variations in thickness necessitate the use of a gauge chart to ensure the metal meets the required dimensions.

    To further assist in understanding sheet metal thickness, it is valuable to consult a steel gauge thickness chart, sheet metal gauge chart, and a GI sheet size chart. These resources provide comprehensive information and visual representation of gauge numbers, corresponding thicknesses, and dimensions. By utilizing these charts, one can select the appropriate gauge and ensure the desired specifications are met for a particular project.

    History of the Gauge System

    The gauge system has a rich history in metal fabrication, believed to have originated in the British wire industry before the widespread adoption of standard and metric measurement systems. Initially, gauges were employed to denote the diameter of metal wire during the drawing process. Over time, this system became prevalent in designating the thickness of not only wire but also sheet metal.

    Within this system, different gauge numbers correspond to specific thicknesses. For example, referring to the keywords provided, we have:

    • 16 gauge thickness in mm: This indicates the thickness, measured in millimeters, of a sheet metal with a gauge number of 16.
    • 14 gauge thickness in mm: Similarly, this denotes the thickness, in millimeters, of a sheet metal with a gauge number of 14.
    • 12 gauge thickness in mm: This represents the thickness, measured in millimeters, of a sheet metal classified as 12 gauge.
    • 10 gauge thickness in mm: Here, we refer to the thickness, in millimeters, of a sheet metal designated as 10 gauge.
    • 20 gauge sheet in mm: Lastly, this term signifies the thickness, measured in millimeters, of a sheet metal possessing a gauge number of 20.

    These gauge numbers provide a standardized system to communicate the wire and sheet metal thickness in mm, offering a convenient reference point for engineers, fabricators, and manufacturers. While the gauge system predates the establishment of standard and metric measurement systems, it has persisted as a widely recognized and utilized method for specifying thickness in the metalworking industry.

    Sheet Metal Gauge Charts

    To determine what metal gauge you need, use these sheet metal gauge charts:

    Mild Steel Gauge Chart Aluminum Gauge Chart Stainless Steel Gauge Chart Galvanized Steel Gauge Chart Brass Gauge Chart Copper Gauge Chart

    Mild Steel Gauge Chart*    
    GaugeNumber Inches MM
    7 .1793 4.554
    8 .1644 4.175
    9 .1495 3.797
    10 .1345 3.416
    11 .1196 3.038
    12 .1046 2.656
    14 .0747 1.897
    16 .0598 1.518
    18 .0478 1.214
    20 .0359 .911
    22 .0299 .759
    24 .0239 .607
    26 .0179 .454
    28 .0149 .378

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    Aluminum Gauge Chart*    
    GaugeNumber Inches MM
    7 .1443 3.665
    8 .1285 3.264
    9 .1144 2.906
    10 .1019 2.588
    11 .09074 2.305
    12 .08081 2.053
    14 .06408 1.628
    16 .05082 1.291
    18 .04030 1.024
    20 .03196 .812
    22 .02535 .644
    24 .02010 .511
    26 .01594 .405
    28 .01264 .321
    30 .01003 .255

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    Stainless Steel Gauge Chart*    
    GaugeNumber Inches MM
    8 .17187 4.365
    9 .15625 3.968
    10 .14062 3.571
    11 .125 3.175
    12 .10937 2.778
    14 .07812 1.984
    16 .0625 1.587
    18 .050 1.270
    20 .0375 .9525
    22 .03125 .7937
    24 .025 .635
    26 .01875 .476
    28 .01562 .396
    30 .0125 .3175

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    Galvanized Steel Gauge Chart*    
    GaugeNumber Inches MM
    8 .1681 4.269
    9 .1532 3.891
    10 .1382 3.510
    11 .1233 3.1318
    12 .1084 2.753
    14 .0785 1.9939
    16 .0635 1.6129
    18 .0516 1.310
    20 .0396 1.005
    22 .0336 .853
    24 .0276 .701
    26 .0217 .551
    28 .0187 .474
    30 .0157 .398

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    Brass Gauge Chart*    
    GaugeNumber Inches MM
    7 .1443 3.665
    8 .1285 3.264
    9 .1144 2.906
    10 .1019 2.588
    11 .09074 2.305
    12 .08081 2.053
    14 .06408 1.628
    16 .05082 1.291
    18 .04030 1.024
    20 .03196 .812
    22 .02535 .644
    24 .02010 .511
    26 .01594 .405
    28 .01264 .321
    30 .01003 .255

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    Copper Gauge Chart*    
    GaugeNumber Inches MM
    7 .180 4.572
    8 .165 4.191
    9 .148 3.759
    10 .134 3.404
    11 .120 3.048
    12 .109 2.769
    14 .083 2.108
    16 .065 1.651
    18 .049 1.245
    20 .035 .889
    22 .028 .711
    24 .022 .559
    26 .018 .457
    28 .014 .356
    30 .012 .305

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    Gauge # Brass & Aluminum Sheets
    INCHES
    Brass & Aluminum Sheets
    MM
    Cold & Hot Rolled Steel Sheets
    INCHES
    Cold & Hot Rolled Steel Sheets
    MM
    Alu., Copper, Brass, & Steel Tubes, Copper Sheets, Hoop Steel
    INCHES
    Alu., Copper, Brass, & Steel Tubes, Copper Sheets, Hoop Steel
    MM
    Stainless Steel Sheets
    INCHES
    Stainless Steel Sheets
    MM
    Galvanized Steel Sheets
    INCHES
    Galvanized Steel Sheets
    MM
    7 .1443 3.665 .1793 4.554 .180 4.572 .1875 4.763 .1681 4.269
    8 .1285 3.264 .1644 4.175 .165 4.191 .17187 4.365 .1520 3.861
    9 .1144 2.906 .1495 3.797 .148 3.759 .15625 3.9686 .1363 3.461
    10 .1019 2.588 .1344 3.416 .134 3.404 .140625 3.571 .1208 3.068
    11 .0907 2.305 .1196 3.038 .120 3.048 .125 3.175 .1053 2.675
    12 .0808 2.052 .1046 2.657 .105 2.667 .109375 2.778 .0946 2.404
    14 .0641 1.628 .0747 1.897 .075 1.905 .078125 1.984 .0785 1.993
    16 .0508 1.290 .0598 1.518 .060 1.524 .0625 1.587 .0635 1.613
    18 .0403 1.024 .0478 1.214 .048 1.219 .0500 1.270 .0516 1.310
    20 .0320 .813 .0359 .912 .036 .914 .0375 .952 .0396 1.006
    22 .0250 .635 .0299 .759 .030 .762 .03125 .793 .0336 .853
    24 .0201 .511 .0239 .607 .024 .610 .025 .635 .0276 .701
    26 .0159 .404 .0179 .455 .018 .457 .01875 .476 .0217 .551
    28 .0126 .320 .0149 .378 .015 .381 .015625 .397 .0187 .475
    30 .01003 .255 .0120 .305 .012 .305 .0125 .317 .0157 .398

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    What is the gauge of sheet metal?

    The term “Gage” or “Gauge” refers to the numerical designation that represents the thickness and weight per square foot of a piece of sheet metal. The gauge values assigned to sheet metal range from 30 to 1, with higher numbers indicating thinner pieces of material.

    What is 20-gauge sheet metal?

    Upon examining these calculations, it becomes evident that 20-gauge mild steel possesses an approximate thickness of 0.3 inches or 0.76 millimeters. This thin yet sturdy material is ideal for a multitude of projects, offering both durability and versatility.

    What is a 12 gauge sheet?

    The 12-gauge provides a minimum sheet thickness of 0.098 inches, whereas the 14-gauge offers a minimum sheet thickness of 0.070 inches. It is worth noting that the 12-gauge sheets are 40% heavier compared to the 14-gauge sheets. These variations in weight and thickness make the 12-gauge sheets suitable for applications involving dynamic pressure, while the 14-gauge sheets are specifically designed for static pressure scenarios.

    What is the gauge size?

    The thickness of a wire is denoted by its gauge. Each gauge is assigned a numerical value, where smaller numbers indicate thicker wire gauges, while higher numbers indicate thinner wires.

    How many mm is 8 gauge?

    For different materials of steel, the same gauge will also correspond to different mm.

    Standard Steel: 8 Gauge = 4.176 mm Stainless Steel: 8 Gauge = 4.191 mm Aluminum, Brass, Copper: 8 Gauge = 4.115 mm

    What is 10 gauge in mm?

    Standard Steel: 10 Gauge = 3.416 mm Galvanized Steel: 10 Gauge = 3.51 mm Stainless Steel: 10 Gauge = 3.571 mm Aluminum, Brass, Copper: 10 Gauge = 2.588 mm

    What is 10 gauge in mm?

    Standard Steel: 16 Gauge = 1.519 mm Galvanized Steel: 16 Gauge = 1.613 mm Stainless Steel: 16 Gauge = 1.588 mm Aluminum, Brass, Copper: 16 Gauge = 1.29 mm

    FAQ

    Which is thicker 18 or 20 gauge sheet metal?
    18-gauge sheet metal is thicker than 20-gauge sheet metal. In gauge measurement, a lower number indicates a thicker metal.
    What is 14-Gauge in mm?
    The 14-gauge is 1.6 mm in diameter.
    How to calculate gauge thickness?
    Gauge = 100 x Mils (e.g., 0.3 mils = 30 gauge)
    To convert mils to microns, multiply by 25.4.
    What is 20 Gauge Sheet Metal Used For?
    20 gauge steel is commonly used for entry doors because it provides durability and resistance to the elements, making it a strong and reliable choice for exterior applications.

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