Product Features
(1) Material and Strength
High-quality Steel: Made of high-quality alloy steel such as 42CrMoA, ensuring the bolt has high strength and good toughness to withstand the high-intensity impact and vibration of excavators and bulldozers under harsh working conditions.
High Strength Grade: Common strength grades include 8.8, 10.9, and 12.9. 10.9 grade bolts have a tensile strength of 1000-1250MPa and a yield strength of 900MPa, meeting the application requirements of most construction machinery; 12.9 grade bolts have higher strength, with a tensile strength of 1200-1400MPa and a yield strength of 1100MPa, suitable for special parts with extremely high strength requirements.
(2) Design and Structure
Head Design: Usually hexagonal head design, which provides a large tightening torque to ensure the bolt remains tightened during use and is not easy to loosen. At the same time, the hexagonal head design is also convenient for installation and disassembly with standard tools such as wrenches.
Thread Design: High-precision threads, generally using coarse threads, have good self-locking performance. The thread surface is finely processed to ensure the integrity and accuracy of the threads, improving the connection strength and reliability of the bolt.
Protective Design: Some bolts have a protective cap on the head. The upper end face of the protective cap is a curved surface, which can reduce the friction between the bolt and the ground during operation, reduce resistance, and improve the working efficiency of excavators and bulldozers.
(3) Surface Treatment
Galvanizing Treatment: To improve the corrosion resistance of the bolt, it is usually galvanized. The galvanized layer can effectively prevent rust and corrosion of the bolt in humid and corrosive environments, extending the service life of the bolt.
Phosphating Treatment: Some bolts are also phosphated. The phosphating layer can increase the hardness and wear resistance of the bolt surface, while also improving the corrosion resistance of the bolt.
