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

Finish Tolerances

When it comes to surface finishes, it's important to factor them into your overall design, as our surface finishes can add anywhere from 0.0004" to 0.003", depending on the finish. For example, when mounting a component that requires a 1" diameter hole (on a surface that will be powdercoated), be sure to call out a 1.006" hole diameter. This will allow for 0.003" of powdercoat per side.

Surface Finish Tolerance
Masking Placement ± 0.080" | 2.03mm
Anodizing Type 2 + 0.0004" | 0.01mm
Anodizing Type 3 + 0.001" | 0.03mm
Powdercoating thickness + 0.003" | 0.08mm

Powdercoat Consistencies

We strive for excellence with the goal of reducing Foreign Object Debris (FOD) and achieving consistency with all silkscreening, and powder coating. However, due to some constraints of our facility, there may be minor blemishes on parts. These blemishes are not distinguishable or seen from an arm’s length away.

Note: Photos have been zoomed in to show minor blemishes.