Yiteng Machinery has overcome the core technology of high-strength bolts, and its product performance has reached the international advanced level

2026-08-24 17:47:15

Ningbo Yiteng Machinery Co., Ltd. has made significant technological breakthroughs in the research and development of high-strength construction machinery bolts. The new 12.9 grade high-strength Track plate bolts and Blade Bolts independently developed by the company have been tested by third-party authoritative institutions, and their tensile strength, fatigue life, and anti relaxation performance have all reached the advanced level of similar international products, marking a crucial step for the company in the core technology of construction machinery fasteners.

As the most fundamental and critical structural connecting component in construction machinery, bolts have a direct impact on the operational safety of heavy equipment such as excavators, bulldozers, and loaders under harsh working conditions. Yiteng Machinery has been deeply involved in the field of construction machinery fasteners for nearly 20 years, with products covering major international standard systems such as National Standard (GB), German Standard (DIN), Japanese Standard (JIS), American Standard (ASTM/SAE), etc. It produces millions of high-strength bolts annually and is one of the important suppliers in the field of construction machinery bolts in China.

The core of this technological breakthrough lies in the dual optimization of material formulation and heat treatment process. After long-term testing, the company's technical team has found the optimal solution for the proportion of trace elements in high-strength alloy steel. By precisely controlling the content of vanadium, titanium and other microalloying elements, the material's high strength (tensile strength ≥ 1220MPa) is ensured while effectively improving its low-temperature impact toughness, enabling the product to maintain stable mechanical properties even in extreme environments of -40 ℃. In the heat treatment process, the company has introduced an advanced controlled atmosphere continuous heat treatment production line, using computer precise temperature control technology to control quenching temperature fluctuations within ± 3 ℃ and tempering temperature within ± 5 ℃, ensuring that the metallographic structure and mechanical properties of each batch of bolts are highly consistent. The temperature fluctuation of traditional heat treatment processes often exceeds ± 10 ℃, which is the main reason for the large variability of bolt performance, "said the company's technical director." We have improved the accuracy by more than three times and solved the quality stability problem from the root

In response to the long-term exposure of construction machinery bolts to corrosive environments such as humidity, salt spray, and mud, Yiteng Machinery has simultaneously completed a comprehensive upgrade of surface treatment technology. The multi-layer composite anti-corrosion coating system developed by the company has passed the 1000 hour salt spray test, and its corrosion resistance is more than 5 times higher than traditional galvanizing process. The coating has strong adhesion with the substrate and is not easy to fall off during repeated bolt disassembly and assembly. In addition, the company has introduced a special anti friction coating technology on the surface of bolts, which achieves precise correspondence between pre tightening force and tightening torque by precisely controlling the friction coefficient, solving the technical problem of "meeting torque standards but insufficient pre tightening force" that has long existed in engineering machinery assembly, significantly improving assembly quality and connection reliability.

On the production side, Yiteng Machinery has continuously increased its investment in intelligent manufacturing in recent years. The high-precision cold heading machine and CNC rolling machine introduced by the company have achieved fully automatic continuous production of bolts from wire to finished products, with a processing accuracy of ± 0.02mm. At the same time, the company has deployed a fully automatic detection system based on machine vision to perform 100% online detection of the thread size, head size, and surface defects of each bolt, with a defect detection rate of over 99.9%. Our goal is to make every factory bolt a high-quality product, "said the production manager of the company. Through the construction of an intelligent manufacturing system, the company has not only improved production efficiency, but more importantly, achieved full chain quality traceability from raw materials to finished products. Each bolt can be traced back to specific production batches, equipment parameters, and testing data.

At present, Yiteng Machinery's bolt products have been widely used in the supporting and after-sales markets of internationally renowned brands of construction machinery such as Caterpillar, Komatsu SUPER V, Volvo, Daewoo, Hyundai, Liebherr, etc. The products are exported to dozens of countries and regions such as Europe, the United States, Canada, and Australia. The company stated that in the future, it will continue to invest in new material development, precision manufacturing processes, and intelligent testing technology around the core product of construction machinery bolts, continuously improving product technology content and market competitiveness, and providing better fastener solutions for global customers.