Stainless Steel Non-Standard Screws With Set External Hexagonal Fastening And Internal Thread

Product introduction

This is a non-standard screw that integrates external hexagonal fastening and internal thread connection. It is made of high-quality stainless steel and has excellent rust and corrosion resistance. We focus on the research and development of various types of special-shaped screws, and can provide non-standard custom screw services with fully customized sizes and head shapes, which are widely used in the fields of photovoltaics, machinery and furniture. From drawings to finished products, precision fit is ensured to meet your personalized connection needs.

 

Product design and features

Integrated structural design: One end of the product is a standard metric or inch external thread for connecting to a nut or base material; the other end is a precision internal thread hole, and the top is designed with an external hexagonal opposite edge. This design allows for multiple connections in a small space without the need for additional welding or intermediate adapters, greatly simplifying the assembly process.

Anti-slip and torque advantages: The external hexagonal head design provides a larger stress surface. When used with a wrench or socket tool, it can withstand greater tightening torque, effectively prevent slipping, and ensure the stability and reliability of the connection.

Surface treatment: The surface of conventional products adopts cleaning and passivation treatment to maintain the silvery white color of stainless steel and has extremely strong corrosion resistance. According to customer needs, it can also be polished, brushed or electroplated to meet the requirements of beauty and durability in different environments.

Non-standard customization capabilities: In addition to standard specifications, our biggest advantage in design is to support the development of special-shaped screws. Whether it is a special-shaped head, extended internal thread depth, or special pitch design, we can conduct reverse research and development according to the customer's assembly space and force requirements.

 

Materials and application areas

Core material: We mainly use high-quality stainless steel wire rods, covering SUS201, SUS302, SUS304 (the most commonly used, excellent anti-rust ability), SUS316 (high strength and seawater corrosion resistance) and other materials. The stainless steel material itself is high temperature resistant, rust-proof, environmentally friendly and 100% recyclable.

Mechanical properties: Through strict heat treatment process (for martensitic stainless steel such as 410/420), the product hardness can reach HV250-400, ensuring shear resistance under high-strength locking.

 

Application areas

Photovoltaic industry: Used for rail connection in photovoltaic bracket systems, using internal and external tooth structures to quickly splice.

Furniture and home appliances: Commonly used in connectors of disassembled furniture, foot pad adjustment feet and insulating isolation columns of electrical appliance casings.

Automation equipment: Used for the installation and fixation of sensor brackets and pneumatic components.

Special environment applications: For harsh environments such as chemical industry and marine engineering, we provide 316 material or non-standard screws to cope with strong corrosion requirements.

 

Quality control and certification system

We know that although fasteners are small, they are the cornerstone of industry. Therefore, we have established a strict quality control system throughout the entire process:

Raw material control: All stainless steel wires entering the factory must provide original material certificates and undergo spectrometer sampling to prevent inferior materials from flowing into the production process.

Molding monitoring: A multi-station cold heading machine is used for one-time molding, and dimensional tolerances are monitored in real time during the production process. For non-standard customized screws, we implement a first-piece full inspection system to ensure that the mold is 100% consistent with the drawings.

Thread accuracy inspection: Use pass-and-stop gauges to fully inspect the internal and external threads to ensure smooth threads and no rotten or missing teeth.

 

Certification system

The company has passed ISO 9001:2015 quality management system certification.

The product complies with the RoHS environmental directive standards, ensuring that it is suitable for export of electronic and electrical products.

Material reports, salt spray test reports (neutral salt spray test can last up to 48-200 hours) and tensile test reports can be provided according to customer needs.

 

Customized services

We not only provide stainless steel external hexagonal internal and external thread screws in standard specifications (such as M3-M20), but we are also committed to becoming your technical partner in fastening solutions. Our customized services include:

Size customization: Whether it is the total length, thread length or internal and external hexagonal dimensions, they can be prototyped and optimized based on the 2D/3D drawings or samples provided by the customer.

Customized head shape and groove type: We are good at producing special-shaped screws, such as hexagonal socket with post, hexagonal head with washer combination, and even irregular polygonal head to meet customers' unique tool installation space requirements.

Thread type customization: Provides various thread types such as M (coarse thread), MF (fine thread), UNC, UNF, self-tapping thread, etc.

Flexible minimum order quantity: For non-standard customized screws in the R&D trial production stage, we support small batch sample production to help customers quickly verify product designs while reducing costs.

 

FAQ

Q: What are "internal and external thread" screws? What is its main function?

A: Internal and external thread screws, also known as hexagonal isolation posts or double-way connecting posts. Its main function is to establish a fixed distance between two objects and provide a threaded connection. To put it simply, the outer teeth are screwed into an object, and the inner teeth are used to fix another object, supporting, connecting, and isolating it.

 

Q: Can you make non-standard specifications? Like extra long or extremely short?

A: Of course. This is our core strength. We have adjustable cold heading machines and precision CNC lathes to handle orders for non-standard screws. Whether the size you need exceeds the national standard range or is a screw with a special shape, we can customize it according to your actual working conditions.

 

Q: How can I ensure that the customized special screws meet my assembly requirements?

A: After we receive the customization consultation, our technical engineer will contact you with the drawing details. After confirming the order, we will use 3D software to simulate and make samples. Only after passing your sample test and confirmation, we will enter the mass production stage to ensure nothing goes wrong.

 

Q: Do the internal and external thread specifications of internal and external thread screws have to be the same?

A: Not necessarily. Standard products usually have the same specifications for internal and external teeth, but for non-standard customized screws, we can design a combination of M8 external teeth and M4 internal teeth according to your needs, thereby realizing the transfer between components of different specifications.

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