Industry knowledge
As the name suggests, fish bolts have a structure similar to the shape of a fishtail. This design is intended to enhance the fixing force between the bolt and the connecting piece, and is particularly suitable for use in railway structures with large forces. It is mainly composed of a screw, a nut and a special bolt head, and the bolt head part often has a special notch or groove for easy installation and locking.
Selection standards and specifications of fish bolts:
In railway engineering practice, the selection of fish bolts follows certain standards and specifications to ensure that their performance meets actual needs. Common specifications include diameter, length, thread grade, etc.
1. Material selection
The commonly used material is high-strength steel, which is heat-treated or surface-anti-corrosion treated, such as galvanizing, chrome plating or spraying anti-rust paint to improve corrosion resistance.
2. Size specifications
Depending on different application scenarios, the diameter of the fish bolt is generally between 16 mm and 30 mm, and the length is selected according to the thickness of the connection. The thread grade is commonly 8.8 or 10.9 to ensure the load-bearing capacity.
3. Performance requirements
In addition to mechanical strength, special requirements such as corrosion resistance, high temperature resistance, and vibration resistance should also be met. For bolts on bridges or in open air environments, special anti-rust treatment measures must also be considered.
Each rail bolt undergoes rigorous testing and multiple process treatments, leaving no detail untouched. From thread accuracy to surface treatment, GNEE RAIL manufactures products with a meticulous attitude to ensure that both service life and installation adaptability meet the standards.
