Metal Fastener

Our company focuses on the research, development, and production of Metal Fastener solutions: Screws, Nuts; Studs; and Stainless Steel Studs. These Metal Fasteners meet the needs of multiple fields, such as power, new energy, and industrial equipment.

The main categories of metal fasteners we produce include:

1. Screw (Screw): used to fasten thin plates or connectors that do not require prefabricated threaded holes.
2. Nut (Nut): used in conjunction with screws and bolts to fasten connections.
3. Bolt (Bolt): used for perforated connections between two or more parts, usually used with nuts.
4. Stud (Stud): with threads at both ends and a bare rod in the middle, often used to connect heavy parts.
5. Washer (Washer): Distribute loads, prevent loosening, and protect connection surfaces.
6. Screw and nut assembly (Assembly): such as a combination of screws + spring washers + flat washers, which is convenient for customers to assemble.

Type Specification Range Strength Grade Tolerance Grade
1. Machine Screw M3-M12 4.8-12.9 GB/T 3103.1-6g
2. Hexagonal Nut M3-M16 5-12 Grade GB/T 3103.1-6H
3. Stud M8-M24 8.8-10.9 GB/T 3103.1-6g
4. Spring Washer 3-24mm HV300-500 GB/T 94.1-8 Grade

According to different application requirements, we select a variety of materials to produce metal fasteners:

Tips: Carbon steel fasteners need to be surface treated according to the use environment, such as electro galvanizing or blackening treatment to prevent corrosion.

We use advanced multi-station cold heading forming machines, combined with one-die three-punch technology for mass production. The process flow mainly includes:

1. Raw material preparation
Select high-quality round steel with a chemical composition that meets the standards, such as SAE 1018, SCM435, 304 stainless steel, etc.

2. Wire drawing
Draw to the required wire diameter, ensure surface finish, and dimensional tolerance ±0.05mm.

3. Cold heading forming
Use a one-die three-punch cold heading machine to continuously complete blank cutting, performing, and forming.
The cold heading pressure range is usually 150 to 800 tons.

4. Secondary processing (thread rolling/thread rolling)
Use a thread rolling machine to form threads, with a dense surface and no cracks.
5. Heat treatment (optional)
For example, carbon steel parts need quenching and tempering, with a hardness of HRC 30-40.

Advantages of cold heading:
High material utilization (>85%);
Improved workpiece strength (due to continuous fiber streamlines);
Good surface finish, reducing post-processing requirements.

To improve the corrosion resistance and aesthetics of metal fasteners, we provide a variety of surface treatment methods:

1. Common treatment process
Electrogalvanizing:
1. Coating thickness: 5-15μm
2. Salt spray test: 72-240h
3. Applicable: general anti-corrosion

Dacromet:
1. Coating thickness: 8-12μm
2. Salt spray test: 500-1000h
3. Applicable: automotive chassis parts

Hot-dip galvanizing:
1. Coating thickness: 40-80μm
2. Salt spray test: 800h+
3. Applicable: outdoor structural parts

2. Special treatment plan
1. Silver plating (electrical contacts)
2. Chemical nickel plating (precision parts)
3. Anodizing (aluminum alloy parts)

To ensure that each batch of metal fasteners meets high-quality standards, we implement a comprehensive quality control system:

Raw material inspection
Test chemical composition, tensile strength, hardness, etc.
Online first-piece confirmation
Before each batch of cold heading, the size and appearance of the first piece are confirmed.
Process inspection and random inspection
Use gauges, calipers, and three-coordinate measuring machines for inspection.
Surface treatment inspection
Use salt spray testers and film thickness meters to detect the corrosion resistance and thickness of the coating.
Full inspection or random inspection before delivery
Appearance, size, and thread gauge inspection to ensure batch stability.

Automotive industry: engine connection bolts, body fixing nuts, airbag fixing screws.

Electrical industry: relay terminal screws, circuit breaker internal connection studs.
Photovoltaic industry: solar panel fixing bolts, bracket connection nuts.
Energy storage industry: battery pack convergence screw nut assembly.
Home appliance industry: air conditioning compressor connection screws, washing machine body fixing nuts.

With advanced one-die three-punch cold heading technology, perfect surface treatment process, and strict process quality control, we are committed to providing high-quality and high-reliability metal fastener solutions to global customers, and through screw nut assembly supporting services, we help customers improve assembly efficiency and reduce comprehensive procurement costs. In the future, we will continue to deepen technological innovation, expand service capabilities, and provide more high-quality screws, nuts, bolts, studs, washers, and customized products and services to more customers in the automotive, electrical, photovoltaic, energy storage, and other industries.

We are a professional manufacturing factory located in Xiamen, a southeast coastal city in China, with more than 20 years of experience in the metal cold-heading industry. With the development of the industry and technological innovation, we have developed from the traditional one-die-one-punch process to the current mature and stable one-die-three-punch cold heading technology, which has not only significantly improved production efficiency but also greatly improved the dimensional accuracy and stability of the products. We mainly produce metal fasteners, including screws, nuts, bolts, studs, washers, etc., and can provide customers with screw nut assembly and other one-stop supporting services, which are widely used in many industries such as automobiles, electrical, photovoltaics, energy storage, and home appliances.

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