"John C" wrote in message
. uk...
What size of nail is reccomended for nailing two 50mm pieces of wood
together. My drawing states 4mm ring nails but is there a rule of thumb on
what length to use.

Regards,

john

In your case, less than 100 mm.

You want to penetrate at least half way into the second part. I'd go for
about 75 mm.