I keep breaking the HPI flange nuts. I broke 4 or 5 last summer on my flux. Ended up trying some axial ones. The HPI ones used to be made better, but the latest version of them has a really thin dome that essentially peals off the nut.
Far left is the old, middle is the new, far right is the axial 31087.
This is how the "new" version breaks:
The issue with the axial ones though is that the threads don't start at the bottom of the flange, so they only grab by a few threads and can be difficult to get started on the axle. They do seem to be holding up though. I have 2 of those on the front of my flux and 2 of the old HPI ones on the rear. Put quite a few packs through it since installing the axials.