I second this suggestion. 3d prints are very much “non-isotropic” — they do not have the same properties (e.g. strength) in every direction. Even if it doesn’t snap off initially, you have proved that it is a weak point. That means it will probably break later even printed in the better filament.
Also, even filaments made by the same manufacturer from the same “feed stock” can have very different properties due to the “master batch” they add for color. 
I’ve used screws for exactly this purpose — giving strength to a relatively narrow part printed vertically — successfully, including for the handle that I put a lot of weight on, here: Parametric speed handle for machinist vise - #5 by mcdanlj
Here it is with modeled threads for an M3x8 screw:
Speaker Mount.FCStd (3.3 MB)