Originally Posted by
FastJake
This is my experience too. The thinnest cheapest ones (not reinforced) are fragile and break if you're not careful but probably cut faster than anything.
Be sure to put a nut on the bolt you're cutting so you can back it off and smooth out the last thread.
And never forget to wear goggles (or better yet a face shield). The thin cut-off wheels can break apart sending high velocity shards right at you.