Nuts are commonly used standard items. They are used with bolts, studs or other threaded workpieces to connect and secure. Usually, the hardness of the bolts selected in the formulation is higher than the compressive strength of the corresponding high-strength nuts, so as to ensure that the service life of the bolts is longer than that of the nuts when used together. When disassembling and replacing standard parts in this way, the cost of replacing nuts will be lower and more convenient. At present, many generator equipment and vehicles such as airports, vehicles, trains and freighters have developed rapidly. Therefore, our high-strength nuts and other clamping parts need to meet the development trend of rapid development in order to achieve great development. High-tenacity bolts are suitable for connecting some major industrial equipment, especially for continuous disassembly and assembly. All kinds of assembly methods require very tall nuts. The thread is also very important. The surface roughness and manufacturing precision of the thread will directly affect the safety performance of the application facility. Generally speaking, in order to adjust the resistance during use and prevent corrosion and clogging, it is usually necessary to coat nickel and phosphorus on the surface. The thickness of the coating is generally adjusted within the range of 0.02-0.03mm. It should be ensured that the coating is uniform, compact and free of pinholes. The Ni-P coating process of high-strength nuts includes three parts: first, preparatory treatment, including the accuracy and shape inspection before the coating, to check whether there are cracks or defects before the coating, manually remove oil stains or pickling passivation. The second is the electroplating process to activate the nut and quickly nickel-plate it, followed by chemical nickel. In the nickel treatment method, a series of organic chemical methods are applied to deposit nickel on the nut, and the last step is the post-treatment process. Post-processing usually includes hydrogen-driven heat treatment processes, grinding and polishing and quality inspection.