Product Introduction of High Strength Nuts

High-strength nuts, known for their excellent performance, play a significant role in various fields. Typically made from high-strength materials, they can withstand considerable preload and are widely used in important connection applications such as bridges, steel rails, and high-pressure equipment. They can be classified in various ways based on their performance and purpose.
According to their use, high-strength nuts are mainly divided into general-purpose nuts, high-strength nuts, locking nuts, and damping nuts. High-strength nuts are commonly used in large mechanical equipment and structural engineering, where they can bear greater load forces to ensure the stability and reliability of connections.

Structurally, high-strength nuts can be further divided into standard nuts, fine-thread nuts, slotted nuts, and square nuts. For instance, fine-thread nuts, with their smaller thread pitch, are suitable for situations where space is limited; whereas slotted nuts are suitable for occasions that require quick assembly and disassembly.
Additionally, high-strength nuts can be classified based on their performance grades, such as grades 8 and 10 in the ISO standard, and grades 4, 5, and 6 in the Chinese national standard. These performance grades are usually related to the mechanical properties of the nuts, including proof stress and Vickers hardness indicators.

The material selection and heat treatment process of high-strength nuts are crucial to their performance. Commonly used steels for high-strength fasteners include 45, 40Cr, 20MnTiB, 35VB, 35CrMo, 42CrMo, and 40CrNiMo, each with different performance characteristics and application scopes. For example, 42CrMo steel, with its high strength and hardenability, is suitable for making large-sized grade 10.9 high-strength nuts.The manufacturing process of high-strength nuts also affects their performance. Heat treatment processes such as quenching and tempering have a significant impact on the material's structure and properties. The correct heat treatment process can ensure that high-strength nuts achieve the required mechanical properties and reliability for use.

In terms of specific standards, for example, GB/T 1229 - 2006 stipulates the requirements for high-strength large hex nuts used in steel structures, including dimensions, mechanical properties, and heat treatment. These standards ensure the quality and applicability of high-strength nuts to meet the needs of different projects and applications.