Fasteners are key spare parts necessary for various mechanical equipment, engineering construction, automobile, electronics industry, aerospace and defense industries, and are widely used in various fields. The production process of fasteners consists of multiple links such as material selection, processing, heat treatment, and surface treatment. Therefore, for manufacturers, the quality of each link must be strictly guaranteed. 1. Material selection: The material selection of fasteners is the key to determine the quality. The material selection should be selected according to the purpose of the fasteners. Commonly used materials are carbon steel, stainless steel, alloy steel, etc. First of all, the raw materials are tested when they are purchased to confirm that they can meet the various chemical composition and mechanical performance indicators, and then they are classified and stored according to the test results. 2. Processing: Processing is a more important link in the production process of fasteners. First of all, stamping, hot forging, stretching and other processing should be carried out according to the drawing to ensure that the product meets the requirements of the drawing, and at the same time provide a good foundation for subsequent processing. The processed products need to be inspected for small size to ensure the accuracy of size. 3. Heat treatment: Before heat treatment, the surface of the rough-processed product will be cleaned to remove impurities such as scale and oil on the surface, so as to ensure that the product can be heat treated normally. Common heat treatment methods include annealing, normalizing, quenching, etc. Different processes control different temperatures, times, rates, etc. to change the crystal structure and properties of steel. 4. Surface treatment: Surface treatment is the key to improving the performance of fastener materials and prolonging the service life. Maijin usually uses electroplating, hot-dip plating, shot blasting, etc. Under normal circumstances, electroplating needs to use the ASM standard to detect the skin content and corrosion resistance, while hot-dip plating needs to be controlled according to different surface treatment methods. 5. Final inspection: Through various inspection methods, including size inspection, hardness inspection, chemical composition analysis, etc., the factory can ensure that the quality of the product meets the standards. QA engineers will check the appearance of the product, and if there are deviations in the details, the product will be restricted from entering the market at this time. The above is the general flow of the fastener production process. Every link of work needs to be carried out rigorously to ensure the stability and reliability of product quality.