Coupling Nut

Since 1990, we have specialized in manufacturing metal components for relays, switches, contactors, and other electrical equipment. Leveraging over 30 years of experience in silver contacts, metal stamping, and welding, we have created Coupling Nuts that combine precision and cost-effectiveness. These parts are characterized by "factory direct supply, full certification guarantee, and customized services," adapting to all scenarios from routine fastening to precision equipment needs.

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Products Description

A Coupling Nut is a fastener used to connect two bolts or screws. It is typically hexagonal in shape with a fully threaded internal structure. Through tightening, it generates stable axial pressure and friction between two or more parts, thus achieving a strong and reliable mechanical connection. Compared to ordinary nuts, the nuts are longer and have a more even load distribution, making them particularly suitable for assembly scenarios requiring long-distance threaded connections or limited space.

Core Features: A Versatile Fastener for Multiple Scenarios

High-Strength Connection Performance

Constructed from high-quality alloy steel or stainless steel, using cold heading or heat treatment processes, ensuring high tensile strength and fatigue resistance, suitable for dynamic load structures.

Precise and Reliable Structural Design

Acorn Nut features a hexagonal shape with a fully threaded through-hole design, facilitating easy tightening. The precision error is controlled within ±0.02mm, adaptable to various threaded fastener specifications.

Multi-functional Adaptable Design

Self-locking Nut available in different lengths, diameters, and surface treatments to meet diverse industrial environments.

Reliable Anti-Loosening Solution

In addition to standard models, Slotted Castle Nuts or combination washers are also available to enhance fastening reliability under vibration.

Slotted Castle Nut

Metal Forming Process: The Foundation of Precision Manufacturing

Cold Forging Process: Threaded Insert Nut utilizes a high-tonnage cold forging machine for one-time forming, resulting in a denser internal grain structure of the metal material, higher strength than machining, and avoiding material waste and stress concentration issues.

Thread rolling process: The blank of the Acorn Nut is extruded and formed using thread rolling wheels, achieving a thread surface roughness as low as Ra0.8μm and a thread accuracy of 6H grade. The smoothness of the fit is superior to machined threads, extending the service life of the connector.

Surface treatment processes: Cap Nut supports zinc plating, nickel plating, passivation, etc. Salt spray testing can reach 48-96 hours. Corrosion resistance meets RoHS and REACH environmental standards, suitable for complex industrial environments such as humid and dusty conditions.

Precision stamping assistance: Combining the factory's mature metal stamping technology, detailed machining, such as positioning grooves and chamfers on the nut end face, can be completed simultaneously, ensuring the assembly accuracy with special nuts such as Self-locking Nuts.

Production Process of Screw Terminal and Coupling Nut

Manufacturing process and type summary: Full category coverage

General-purpose connecting nuts	Basic hexagonal full-thread type, suitable for routine fastening of most equipment, and a standard part for relay housings and switch assemblies.
Extended connecting nuts	50%-100% longer than the standard type, allowing connection of longer screws, suitable for the frame structure of large contactors.
High-strength connecting nuts	Made of 45# steel with a tempered finish, achieving a tensile strength of 8.8 or higher. They can replace some Slotted Castle Nuts in high-load applications.
Corrosion-resistant connecting nuts	Made of stainless steel with passivation treatment. Suitable for fastening equipment in outdoor and chemical environments. When used with Coupling Nuts, they provide an embedded, corrosion-resistant connection.