China Hexagon socket head cap screw Factory

In many industries, the welding nut is a vital part of it, providing a safe and durable fixed solution for extensive applications. In this article we will explore the process, characteristics and applications of welding nuts.

Salt spray testing is a method that simulates the corrosive conditions found in marine environments. By simulating the condensation of various ions from seawater into a mist in an open-air setting, stainless steel fasteners are exposed to this environment to evaluate their corrosion resistance. Under these conditions, the fasteners are subjected to corrosive factors such as chloride ions and salt, which accelerate the oxidation rate of the metal surface, thereby affecting their service life and safety.

Stainless steel three-piece bolts typically consist of a stainless steel bolt, a spring washer, and a flat washer. The spring washer is used to increase the bolt’s preload and prevent loosening, while the flat washer increases the contact area between the bolt and the connected components, reduces pressure, and protects the surface of the connected parts.

When standard bolts are used for permanent connections, they must meet the following requirements: 1. For general bolted connections, flat washers should be placed under both the bolt head and the nut to increase the bearing surface area. 2. Flat washers should be placed on both the bolt head and the nut side. Generally, no more than two flat washers should be placed on the bolt head side, and no more than one flat washer should be placed on the nut side.

On June 24, 2026, Fastener Fair Italy 2026 officially kicked off at CityLife – Allianz MiCo in Milan, Italy. The event gathers renowned manufacturers, suppliers and professional buyers from across Europe and worldwide, building a high-end platform for industry communication and business cooperation.

The trends toward larger turbines and deeper offshore locations place more stringent demands on core components. As core connecting components of wind turbines, fasteners are widely used in critical locations such as tower flanges, blade roots, nacelle bases, and offshore pile foundations. Data shows that over 60% of an offshore wind turbine’s structure relies on fastener connections, while 15%–20% of structural failures in offshore wind turbines are caused by bolt corrosion, loosening, or fatigue failure. It can be said that the quality of fasteners directly determines the operational safety and O&M costs of wind turbines. Extreme operating conditions at sea—including high salt fog, severe typhoons, and continuous vibration—make standard fasteners highly susceptible to rust, loosening, reduced service life, and downtime for repairs. This represents a core pain point prevalent across the industry.