@ketchup I would like to know why you say not to use a stainless nut, though. I
build a lot of stainless parts for race cars and for food and beverage
and try not to use stainless nuts on stainless bolts due to galling, but
that’s only if they have a decent amount of torque applied to them. For
lightly tightened things like a transformer, though, there usually
isn’t a galling problem. So, why not use a stainless nut? You could
always use a little bit of anti-seize if you’re worried about galling.
Anti-galling compound should work fine... I'm just nervous about it perishing and being a problem years down the road.
Just for fun, if you have one of those lazer temperature sensing gadgets, its easy enough to see that a ferrous bolt runs considerably hotter than the transformer itself. Its also easy to see that the latter runs cooler once the bolt is replaced.
