Kanawatugi’ is one of the traditonal jointing skill of wooden building making, and it gives the strongest jointing strength.Specific interlocked shape with inclinated slope provides strong joint for any direction.
Best system connecting the joint more than using nail or metalic joint and also chemical bonding.
Mortise joint by wood provides stronger and longer life than any metal and or cheminal joint.
A major feature of Japanese woodwork is how carpenters work without screws, nails, or any other metal fasteners to keep the wood together, which they say makes the foundation much stronger and longer-lasting.
So to join pieces of wood together, the carpenters must make a series of complex joints that perfectly fit into one another.