Protocase Resources

The information below is intended to be helpful for customers who wish to learn more about enclosure design. Also, please use our online support if you have questions for our expert design staff.


Fabrication Tolerances for Dimensional Variance in Sheet Metal and Machined Parts

Standard Tolerances For Perforated Sheet Metal

Usually, choosing material thickness is one of the first steps a designer takes when starting a project. We work with nominal thicknesses, so it's important to know the thickness tolerance on the material you chose, in order to know if the final product will be suitable for your application. It's also important when working with sheet metal that you factor in finish tolerances. For example, if you add a finish such as powdercoat, you add more thickness - this should be factored into your design at the beginning.

Perforated metal is any type of sheet metal that has a pattern of holes punched into it. This makes it useful for controlling the passage of air, light, liquids, and even sound. Perforated sheet metal is most commonly used for ventilation and filtering.

Stocked Perforated Sheet Metal

Aluminum Specified Thickness Tolerance
20 Gauge 0.032" | 0.81 mm ± 0.0030" | 0.08mm
Cold Rolled Steel Specified Thickness Tolerance
22 Gauge 0.030" | 0.76 mm ± 0.0030" | 0.08mm