Quote Originally Posted by twinsrus View Post
(They are lag bolts - smooth with threads at one end for a nut.) Suggestions?
Lag bolts have a very course thread on them that bites into the wood itself, they do not have huts.

Standard bolts have machined threads that accept a nut to provide the clamping force.

As suggested, use a bolt of similar size to drive out the one you're trying to remove. If you have a slide hammer, attach it to the head of the bolt and have at it.