Anti loosening bolts are specialized high-strength fasteners designed for vibration and impact conditions. They integrate anti loosening structures with high-strength bolt bodies and are used with matching nuts to effectively solve the problem of thread loosening during long-term operation of engineering machinery, mining equipment, rail transit, and wind power equipment. The products are divided into various styles such as flange anti loosening bolts, toothed anti loosening bolts, full thread anti loosening bolts, nylon locking matching bolts, and tooth surface anti slip bolts, covering high-strength specifications of national standards and can match various standard and non-standard assembly needs. The main body of the product is made of 40Cr, 42CrMo alloy structural steel, and 304/316 stainless steel raw materials, with strength grades including 8.8, 10.9, and 12.9. Adopting the cold heading integrated molding process, the shaft is processed by precision rolling, and the thread profile is uniform and full, with tight meshing; High strength models undergo quenching and tempering heat treatment, achieving a balance between tensile strength and fatigue toughness. They are not easily deformed or fractured under long-term heavy load stretching. Adding anti slip tooth patterns to the head, thickening the anti slip surface of the flange and other anti loosening structures, increasing the friction force of the contact surface, and physically suppressing thread rotation; Paired with nylon anti loosening nuts and all metal locking nuts, it forms a dual self-locking protection, even if the equipment is continuously bumped or subjected to high-frequency vibrations, it will not loosen or fall off. The surface supports anti-corrosion treatments such as blackening, electroplating, hot-dip galvanizing, Dacromet, zinc nickel alloy, etc. The coating is dense and uniform, resistant to mud, rain, salt spray, acid and alkali corrosion, and is not easy to rust due to long-term use in harsh outdoor, mining, and coastal environments. Each batch of products has passed thread stop gauge testing, tensile load testing, repeated vibration anti loosening testing, hardness testing, dimensional tolerance standards, and good interchangeability. Compared with ordinary standard bolts, anti loosening bolts significantly reduce the risk of equipment failure and shutdown caused by loose fasteners, reduce the cost of later maintenance and replacement, and are widely used in assembly parts with severe vibration such as excavator, bulldozer chassis, wind turbine tower, photovoltaic bracket, rail transit equipment, mining machinery, pressure vessels, automation equipment, etc. Regular standard specifications are readily available in stock, supporting customized extension, thickening, fine teeth, and special anti slip structure non-standard anti loosening bolts according to drawings. They are securely fastened and stable, with long-term maintenance free performance.