China Hex coupling nut Manufacturers, Suppliers, Factory

​A bi-metal screw is a type of screw designed for specific applications where temperature changes or electrical currents are factors. It consists of two different metals bonded together: typically steel and copper or steel and aluminum. The head of the screw is made of one metal, while the threaded portion is made of another.

This news introduces our factory’s 2026 production line and quality control system upgrade. With years of manufacturing experience, professional process control, authoritative certifications and complete service system, we enhance product stability and supply capacity to better serve global B2B buyers, engineering contractors and overseas importers.

A thick zinc layer is formed on the surface of the bolt, providing long-term corrosion protection, suitable for outdoor and humid environments.

In 2026, digitalization, intelligence, and green development have become the three core driving forces of the global fastener industry. Intelligent manufacturing improves product consistency, quality stability, and production efficiency, providing safer and more reliable fastening solutions for engineering, construction, energy, and machinery worldwide. Ningbo Gangtong Zheli Fasteners will continue to promote intelligent upgrading, strengthen quality control, and provide global customers with high‑standard, high‑performance, and highly reliable fastener products. We believe that technological innovation will lead the industry to a more efficient, stable, and sustainable future.

Blind Rivets is a type of mechanical fastener that is used to join two pieces of material together. It is known for its ability to be installed from one side of the workpiece and is commonly used in situations where access to the opposite side is limited. Blind rivets consist of a mandrel, which is pulled through the rivet body, deforming it and creating a joint.

In the field of mechanical engineering and manufacturing, spring washers are a common fastener. They play an important role in connecting parts to ensure the stability and reliability of the connection. This article will explore the definition, function and application of spring washers.