Grade 8/Grade 10 High-strength Black Oxide Hex Nut (DIN934/GB Chinese National Standard Thickened Nut)

1. Applicable fields and implementation standards

The product is produced in compliance with DIN934 German standard and GB/T6170 Chinese national standard. It is divided into two high-strength grades, grade 8 and grade 10, and is suitable for heavy-load assembly scenarios such as engineering machinery, steel structures, mining equipment, wind power, road and bridge infrastructure, and automobile chassis. Products are exported to overseas markets such as the Middle East, Southeast Asia, Europe and the United States all year round, meeting the bulk purchase needs of foreign trade wholesalers and engineering buyers.

2. Material Selection and Production Process

The raw materials are selected from high-quality large-scale steel plants. After quenching and overall heat treatment, the hardness and tensile properties are far superior to ordinary grade 4 carbon steel nuts, and they are not easy to crack when locked under heavy pressure. The internal threads are processed by precision tapping, and the threads are regular and smooth, and they mesh tightly with high-strength bolts of the same specifications, eliminating the problems of slipping threads and locking failures during installation. The surface is treated with high-temperature black oxide to form a dense protective layer without the problem of coating peeling off. It is resistant to oil stains and high temperatures, and is suitable for indoor equipment in closed assembly environments. In addition to the standard thickened nuts, there are also thin nuts and flange nuts in stock available to adapt to different installation spaces.

3. Quality control and delivery strength

M6-M48 full range of specifications are in stock all year round, with sufficient in stock turnover, and small samples and full-container large orders can be quickly arranged. Factory layered sampling inspection: three quality inspections: hardness test, thread pass and stop gauge inspection, and dimensional verification. Relevant quality inspection information can be issued for each batch to meet overseas customs declaration and project acceptance standards, and the delivery time is stable and controllable.

4. Matching and customization services

Supports complete package shipment of bolts, flat washers and spring washers, and provides one-stop fasteners, saving customers the trouble of purchasing from multiple sources. At the same time, we undertake according to drawings or samples nonstandard customized, and can change the size, strength level and surface technology as needed, and flexibly respond to the personalized fastening needs of special equipment and special projects. Wotu relies on the large-scale production capacity of its own factories and long-term stable supply. It is the preferred supplier for overseas hardware trade and engineering projects.