An Overview of the Company's Technical Strength

Handan Guangxuan Fastener Manufacturing Co., Ltd. is located in the Yongnian Standard Fastener Industrial Base of Hebei Province, benefiting from the three-dimensional transportation network including the Jingguang Railway and National Highway 107, achieving efficient logistics distribution. As a company specializing in customized processing of fasteners, its core products include high-strength bolts, nuts, and non-standard special-shaped parts, covering scenarios such as tower cranes, construction machinery, and building structures. The company is equipped with a full-process standardized quality management system, where products must pass through 12 quality inspection procedures from raw material entry to finished product shipment, ensuring compliance with national standards such as GB/T 3098.1-2010 and customers' customized requirements.

Section 2: Technical Analysis of High-Tensile Fastener Nuts and Bolts

1. Material and Technology
Guangxuan Fasteners uses alloy steels such as 40Cr, 35CrMo as raw materials, enhancing product density through hot forging forming technology. Taking the M36×150 high-strength bolt as an example, it has a tensile strength of 1040MPa, yield strength ≥940MPa, hardness range of 33-39HRC, and can withstand extreme temperature environments from -40℃ to +200℃. Surface treatment is done with Dacromet coating, salt spray test ≥1000 hours, and anti-corrosion performance superior to traditional galvanized processes.

2. Optimized structural design
For high-stress scenarios, the company has developed a combination structure of trapezoidal screw threads and bolted hinge holes. Through finite element analysis (FEA), the thread tooth shape has been optimized, reducing the stress concentration factor to below 1.8, which increases the fatigue life by 30% compared to traditional designs. For example, in the connection of tower crane standard sections, this structure can withstand dynamic loads up to 200 tons, meeting the requirements of JGJ 196-2010 "Safety Technical Code for the Installation, Use, and Dismantling of Construction Tower Cranes."

Chapter 3: Review of Typical Application Cases

1. A large-scale wind power project
In the construction of a 50MW wind farm in Inner Mongolia, Guangxuan Fasteners provided high-strength connectors for 25 2.5MW wind turbines. In response to the frequent sandstorms in the local environment, the company customized nut structures with sealing rings, paired with special lubricants, extending the maintenance cycle from 6 months to 18 months. Over the past 3 years of project operation, the bolt loosening rate has been less than 0.3%, a 5-fold increase over the industry average.

2. Cross-sea bridge construction
In a certain cross-sea bridge project in Fujian, Guangxuan Fasteners has developed corrosion-resistant double-head bolts. By adding 0.3% copper element and micro-alloying treatment, the product has a corrosion rate of only 0.02mm/year in simulated seawater with a Cl- concentration of 3.5%. This batch of 23,000 bolts has been in stable service for 5 years without any fractures or severe rusting.

Four, Technical FAQ

Q1: What is the core difference between high-strength bolts and ordinary bolts?
A: High-strength bolts enhance material properties through heat treatment, with pre-tension design values up to 2-3 times that of ordinary bolts. For instance, the yield strength of 8.8-grade bolts is ≥640MPa, while that of 4.8-grade bolts is only ≥320MPa.

Q2: How to choose the appropriate bolt grade?
A: Selection based on stress level of application scenario: Grade 8.8 for general mechanical connections; Grade 10.9 for heavy-duty structures; Grade 12.9 for extreme environments such as aerospace. Guangxuan Fasteners can provide a full product range from Grade 4.6 to Grade 12.9.

Q3: What is the delivery period for non-standard customized parts?
A: Standard products can be shipped within 3-5 days, while non-standard items require assessment based on complexity. For instance, M48 bolts with special coatings, it takes about 15 working days from design confirmation to finished product delivery, during which 3D models and stress analysis reports will be provided for customer review.