I have broken a few Torx bits - T25 used on aluminium casings and lids for electric motors. Exposed to the salt-air environment and covered with silicone still doesn't protect them. It also doesn't help that the idiot manufacturers.... "SEW Eurodrive" thread the terminal box AND the lid. So you end up binding two threads and then add the corrosion factor in the mix.
I fixed that when I found out - I drill out the lids now and just have one thread to deal with.
Doesn't help our buddy eldubb, but it does re-assure him that he is not the only one capable of breaking Torx bits..... it is easily done.

I had to smash a way into this terminal box....and replace it of course.
This is a new motor with a special high-quality rough-service coating (extra paint) and look at the stupid screws. So I finished it up like this.....
That was after drilling out the lid threads.....only trouble is that silicone takes a while to remove if you ever need to get back in again.
Another example of better protection......
This is what happens when a redneck Mechanical guy gets his hammer swinging......
I fixed that when I found out - I drill out the lids now and just have one thread to deal with.
Doesn't help our buddy eldubb, but it does re-assure him that he is not the only one capable of breaking Torx bits..... it is easily done.

I had to smash a way into this terminal box....and replace it of course.
This is a new motor with a special high-quality rough-service coating (extra paint) and look at the stupid screws. So I finished it up like this.....
That was after drilling out the lid threads.....only trouble is that silicone takes a while to remove if you ever need to get back in again.
Another example of better protection......
This is what happens when a redneck Mechanical guy gets his hammer swinging......