There are many applications where a machine thread is required in wood. Threaded inserts are very useful because any assembly put together with them can be dismantled. They are therefore perfect for prototypes, jigs and permanent assemblies which are more rarely broken down but which require this feature as a part of the design. 

These zinc plated steel inserts are suitable for the hard wood, the external threads with knife edges bite deeply into the wood and keep the insert securely in place. The internal threads are of the standard metric thread which allows numerous fasteners to be used.