When working with sheet metal, it’s important to understand gauges. The gauge of sheet metal refers to its thickness. It’s important to know the gauge for your project to ensure you’re using the correct thickness of metal.
However, a gauge number doesn’t directly tell you the thickness in millimeters (mm) or inches. That’s where a gauge in mm chart comes in handy. These charts allow you to quickly convert between gauge numbers and actual measurements.
Keep in mind that different materials, like steel and aluminum, may have slightly different thicknesses for the same gauge number.
What is sheet metal gauge?
Gauge is a way to specify the thickness of a sheet of metal without referring to standard or metric measurements. The system dates back to the British wire industry.
With gauge, a higher number means a thinner piece of metal. In other words, the lower the gauge, the thicker the metal. It’s important to remember that gauge numbers aren’t linear measurements.
Why use gauges?
The gauge system has been around for many years, and it’s a method of standardization. Gauges are also useful in manufacturing and design.
Gauge to Millimeter (mm) Conversion Charts
If you’re working with metal, you know that “gauge” numbers don’t directly correlate to metric or imperial measurements. That’s why you need a conversion chart that shows you the equivalent gauge in millimeters or inches.
These charts make it easy for you to quickly and accurately convert from gauge to a measurement.
Keep in mind that different materials require different charts because the same gauge number doesn’t mean the same thickness across all materials.
How to use the charts
To use a chart, just find the gauge number you’re working with, then locate the corresponding thickness in millimeters (mm) for that particular material. For example, 18-gauge steel is equal to 0.0478 inch or 1.214 millimeters.
Common materials and their charts
Here are some of the materials for which gauge charts are commonly available:
- Mild steel
- Aluminum
- Stainless steel
- Galvanized steel
- Brass
- Copper
What affects gauge thickness?
The relationship between gauge and thickness isn’t always straightforward.
- Material Properties: Different materials have different densities and strengths. For example, the same gauge in steel and aluminum will have very different thicknesses. Material properties help determine the best gauge for the job.
- Manufacturing Processes: Processes like rolling can change the final thickness of sheet metal. It’s important to factor in manufacturing tolerances when you’re choosing a gauge.
Closing Thoughts
When you’re working with sheet metal, understanding the gauge and its millimeter conversion is essential. A gauge chart will help you choose the right metal thickness for your project.
Remember to use a conversion chart specific to the type of metal you’re using. This will help you find the correct millimeter measurement for the gauge you need.