by maintenanceguy » 28 Jan 2009 19:34
We use those kind of bolts on street signs to make the vandal proof. Once the head snaps, no regular tool will remove them.
Since I fix stuff for a living (or at least supervise the guys that do), here's how I'd handle that: They make a set of sockets for removing damaged bolts and nuts. It's a set of sockets with a tapered, left hand thread inside instead of the usual hex head. You put them on a damaged bolt and turn with a ratchet. The socket threads itself firmly onto the fastener and removes it.
Or, I would put a nut over the end of the bolt and weld the nut to the bolt inside the nut. They use any wrench to remove. But first, I'd try the simple way, I'd just use a pair of vice grips and see if that would turn them.
-Ryan
Maintenanceguy