Metal work refers to a series of processes that manufactures and constructs various metal finishing materials. In this paper, three steps of fundamental experiments of bolted joints in metal work were conducted. The test results show that the slotted hole reduces slip coefficient by about 30% and the slip coefficient of the surface treatments for rust and corrosion prevention is about half smaller than that of the surface in high strength bolted friction joints. Furthermore, from the experiments on the examples of metal finishing materials, the structural safety of the bolted joint against external forces was investigated.
