When using nut slots, it is important to choose the correct screw length. If the screw bottoms out in the slot before tightening has taken place, the nut can be sheared through the flanges in the aluminum, leading to a weak connection.
Another important factor to consider is that nut slots can only achieve a limited part of the strength corresponding to the bolt dimension. Therefore, they should be used in applications where the mechanical requirements do not exceed what the design can handle.
