Purple Copper Stepped Cold Heading Parts

Product introduction

This product is a typical custom-made non-standard screw, which is integrally formed using a multi-station cold heading process. The shaft is equipped with a precision step structure to achieve axial limit and precise positioning. As special head screws, various head types such as round head, flat head, and countersunk head can be customized to meet different assembly needs.

The product is made of high-purity copper and is a high-quality copper fastener with excellent electrical conductivity, thermal conductivity and non-magnetic properties. It is widely used in electrical connections, precision electronics, cooling systems, medical equipment and other scenarios.

We focus on customization services for non-standard fasteners. Step size, head shape, and surface treatment can all be customized according to drawings. As customized special shape fastener parts, we support small batch samples and large batch supply. Welcome to inquire about drawings.

 

Product features

Step structure: The shaft is equipped with integrated precision steps, which can achieve axial positioning during installation to prevent over-twisting or excessive locking. It is especially suitable for limit connections of multi-layer boards or precision components;

Cold heading integrated molding: using multi-station cold heading technology, one-time molding, no cutting processing, complete metal flow lines, and product strength is significantly higher than turned parts;

Advantages of red copper material: Red copper contains ≥99.5% copper, has excellent electrical conductivity, thermal conductivity and corrosion resistance, good plasticity, and is suitable for electrical and thermal conductivity scenarios;

Special head type design: As special head screws, various head types such as round head, flat head, countersunk head, knurled head, hand-tightened head, etc. can be customized to adapt to different assembly needs.

Non-magnetic properties: Red copper is non-magnetic and is suitable for precision instruments, medical equipment and other occasions that are sensitive to magnetic fields.

 

Materials and application fields

Red copper (T1, T2, T3, TU1, etc.): copper content ≥99.5%, electrical conductivity up to 57% IACS, excellent thermal conductivity, good plasticity, but relatively low strength, suitable for electrical conductivity, thermal conductivity and sealing scenarios;

Oxygen-free copper (TU1): extremely low oxygen content, suitable for vacuum environments and high-demand electrical connections;

Optional materials: In addition to copper, copper alloy materials such as brass, bronze, and beryllium bronze can also be selected according to needs.

 

Application areas:

Electrical connection: The terminal blocks in transformers and distribution cabinets use the high conductivity of copper to reduce contact resistance. The contact resistance of pure copper screws is 80% lower than that of steel screws;

Precision electronics: circuit board (PCB) grounding screws, anti-static connectors, and the non-magnetic nature of copper can avoid interference with the magnetic field of precision instruments;

Heat dissipation system: LED heat dissipation module, power module radiator fasteners, utilizing the excellent thermal conductivity of copper;

Medical equipment: fasteners in nuclear magnetic resonance equipment (MRI) and precision electromagnetic instruments to avoid magnetic field interference;

Lightning protection grounding: a fixture of the building’s lightning protection belt to ensure stable conductive performance of the grounding line;

New energy: limited fastening of electric vehicle battery connecting pieces and charging pile conductive modules.

 

Quality control and certification system

Raw material control: All copper materials come with material certificates, and the copper content and impurity components are verified by a spectrum analyzer to ensure compliance with T1, T2 and other brand standards;

Cold heading process control: Using a multi-station cold heading machine, it can complete automated and continuous production of cutting, heading, accumulation, forming, chamfering and other processes, with high production efficiency and good product consistency;

Dimensional accuracy control: Key dimensions (step diameter, step length, head size, total length) are fully inspected or AQL sampled using professional measuring tools such as image measuring instruments and projectors. The precision tolerance can reach ±0.05mm;

Step accuracy control: step length and diameter tolerances are strictly controlled to ensure reliable precision limit function;

Mechanical property testing: including tensile strength and hardness testing to verify the material properties after cold heading;

Conductive performance test: According to customer requirements, resistivity or conductivity test reports can be provided;

System certification: The company has passed ISO 9001 quality management system certification. Automotive and electronic products can meet the requirements of IATF 16949, ensuring that each batch of non-standard fasteners has complete traceability.

 

Customized services

Size customization: step diameter, step length, shaft diameter, head size, and total length can all be customized according to customer drawings or samples;

Head type customization: As special head screws, special head types such as round head, flat head, countersunk head, knurled head, hand screw head, T-shaped head, mushroom head, etc. can be customized; step structure customization: single step: to achieve single-point limit; multi-step: to realize multi-point limit or different diameter fit; taper step: to realize guide and press-fitting functions;

Material customization: red copper T1, T2, TU1 oxygen-free copper, or optional brass, bronze, beryllium bronze, etc. according to conductivity/strength requirements;

Surface treatment customization: passivation, silver plating, tin plating, nickel plating, etc. can be provided according to anti-corrosion or appearance requirements;

Packaging method: Anti-static packaging, tape packaging, and customized labels can be provided to meet the needs of automated assembly.

 

FAQ

Q: What is the difference between copper step cold heading parts and ordinary turned parts?

A: Cold heading parts are formed in one step using a multi-station cold heading process. The metal flow lines are complete, the product strength is higher than that of turned parts, the material utilization rate is high (up to more than 90%), and the production efficiency is also higher. Turned parts are suitable for small batches or complex shapes, while cold heading parts are more suitable for high-volume production. This product is a customized non-standard screw, and the cold heading process can effectively reduce costs.

 

Q: Why choose copper material?

A: Red copper contains ≥99.5% copper and has excellent electrical conductivity (conductivity 57% IACS) and thermal conductivity. It is also non-magnetic and corrosion-resistant. As a copper fastener, it is particularly suitable for electrical connections, cooling systems and precision instruments that are sensitive to conductivity and magnetic field interference.

 

Q: Is this product a standard part?

A: No. Copper step cold heading parts are non-standard fasteners. There are no unified standard specifications on the market. They need to be customized and produced according to the customer's specific size, step position, head shape and other requirements.

 

Q: As a customized non-standard screw, what is the minimum order quantity?

A: The minimum order quantity depends on the complexity of the product and the production process. When using the cold heading molding process, it is recommended that the minimum order is 10,000-50,000 pieces because special molds need to be made; when using CNC processing, small batch customization of several hundred pieces can be supported.

 

Q: How to ensure the accuracy of the step structure?

A: We use precision multi-station cold heading molds, and the step length and diameter tolerances can be controlled within ±0.05mm. Each batch of products is tested using an image measuring instrument to ensure the limit accuracy of customized special-shaped fastener parts.

 

Q: Do copper step cold heading parts need surface treatment?

A: Copper itself has certain corrosion resistance and does not need to be treated in a dry indoor environment. If you need to enhance corrosion resistance, improve welding performance or have a specific appearance (such as silver plating to reduce contact resistance), passivation, silver plating, tin plating, nickel plating and other treatments can be provided.

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