How do I fix stripped bolt holes in wood?
If the threads are in metal, then you can replace the threads. What you're looking for is called a T-nut and should be available at any hardware store. Take a bolt with you to get the right size.



If the threads are in the wood, a simple option is to just take the bolt to a hardware store and buy a bigger bolt. T-nuts are also a good option if a bigger bolt isn't practical, but you will also need new bolts because you will not find T-nuts that match the threading of your current bolts.