Square Bolt are our common fastener products. They are used with bolts, studs or other threaded workpieces for attachment and fixing. Generally, the strength of bolts selected in the design is higher than that of corresponding high-strength square bolts to ensure that the bolts have a longer life than square bolts when used together. When fasteners are removed and replaced in this manner, the cost of replacing square bolts will be cheaper and more convenient.

Currently, many power generation equipment and vehicles such as airplanes, cars, trains and ships are developing rapidly. Therefore, our high-strength square bolts and other locking parts need to adapt to the rapid development trend in order to achieve greater development. High-strength bolts are mainly used to connect some important mechanical equipment, especially for repeated disassembly and assembly. Various assembly methods require very high square bolts. The thread is also very important. The surface quality and manufacturing accuracy of the thread directly affect the safety factor of the equipment used.

In general, in order to adjust the coefficient of friction during use, to prevent rust and clogging, it is usually necessary to coat the surface with nickel and phosphorus. The thickness of the coating is generally controlled within the range of 0.02-0.03mm. The coating should be uniform, compact and free of pinholes.

The Ni-P coating process of high-strength bolts includes three parts: first, pretreatment, including precision and appearance inspection before plating, to see if there are cracks or defects before plating, manually removing oil stains or dipping pickling. The second is electroplated to activate the bolt and quickly nickel plated, followed by electroless nickel plating. During the nickel treatment, a series of chemical methods are used to deposit nickel on the bolts, and the final step is post-treatment. Post-processing usually includes hydrogen-driven heat treatment, polishing, and finished product inspection.

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