Custom-Made Hexagonal Flange Surface Non-Standard Screws

Product introduction

This non-standard screw is designed with a high-strength hexagonal flange surface. The core feature is that the head is uniquely processed with a semicircular groove to facilitate the fitting and driving of specific tools. The product combines the anti-loosening advantage of the large contact area of ​​the flange surface with the exclusive functionality of the customized groove. Usually made of carbon steel after heat treatment, it reaches high strength of 10.9 or above. It is widely used in mechanical equipment and automobile manufacturing fields that have special requirements for connection stability and installation methods.

 

Product design and features

In the field of precision manufacturing, standard parts often cannot meet the installation requirements of complex working conditions. The high-strength hexagonal non-standard blue screw we introduced is a typical special-shaped screw. Its core design lies in the unique structure of "the head is recessed into half a circle." This seemingly simple geometric variation actually contains profound engineering considerations:

Innovative concave round head design: The concave semicircular structure of the head is not only for identification, but also to achieve precise torque transmission under specific tooling, prevent slipping, and reduce the overall height, making it suitable for assembly environments with limited space.

Compound drive structure: This special-shaped screw combines the composite drive method of external hexagonal and internal concave circles, providing dual installation options, which greatly improves the flexibility and convenience of assembly.

High-strength flange load-bearing: The flange surface design increases the pressure dispersion area with the contact surface, which effectively protects the workpiece surface while ensuring the locking force. It is especially suitable for high-strength connection scenarios that are sensitive to vibration.

 

Materials and application areas

Core material: Made of high-quality alloy steel (such as SCM435, 40Cr) and stainless steel (304, 316). After multiple heat treatments, the product ensures that the product reaches a high strength level of 10.9 or even 12.9.

Surface treatment: The unique "blue" color surface treatment (usually zinc-aluminum coating or Dacromet process) gives the screws extremely strong corrosion resistance and can withstand salt spray testing for more than 1,000 hours.

 

Typical application areas

New energy vehicles: battery pack case connection, motor mounting.

Rail transit: modular installation and shock absorption system inside the carriage.

Heavy machinery: Guards and structural parts in high-vibration areas are fixed.

Photovoltaic and wind power: a key connection in the transmission mechanism of the sun-chasing system.

 

Quality control and certification system

Incoming material inspection: A spectrometer analyzes the chemical composition of materials to eliminate inferior steel from the source.

Molding monitoring: A multi-station cold heading machine is used for one-time molding, and an optical image screening machine is used to eliminate products with unqualified concave round heads.

Mechanical property testing: Equipped with a universal testing machine and hardness tester, each batch is randomly inspected to ensure high strength properties and to ensure that the yield strength and tensile strength meet the standards.

Certification system: The factory strictly operates the ISO 9001:2015 quality management system, and the products comply with the requirements of the RoHS environmental directive. Material certification reports and full-size inspection reports can be provided according to customer needs.

 

Customized services

We know that behind every innovative design, there are unique connection requirements. We focus on the R&D and production of non-standard custom screws, providing you with "one-stop" service from drawings to finished products:

Size customization: Whether you need micro screws below M4 or large fasteners above M20, we can adjust the rod diameter, tooth length and head thickness.

Head type/groove type composite customization: On the basis of the existing "recessed half circle", various driving forms such as "inner hexagonal" and "plix groove" can be superimposed to create unique and special-shaped screws.

Performance customization: According to your installation torque and working environment, adjust the heat treatment process or surface coating (such as Jumate, Teflon, etc.).

Marking service: The customer's LOGO or intensity level can be laser-marked on the concave surface of the head to enhance brand recognition.

 

FAQ

Q: Why are they called "non-standard screws"? What is the difference between it and ordinary external hexagonal screws?

A: The reason why it is called a non-standard screw is because its head geometric dimensions (especially the recessed semicircular structure) do not have completely corresponding standard specifications in GB (national standard), DIN (German standard) or ISO (international standard). Compared with ordinary external hexagonal screws, it has a lower head height and an exclusive anti-slip design, and is a typical special-shaped screw.

 

Q: Can the "half-circle" groove on the head of this screw be installed using ordinary tools?

A: Yes. Although it is a non-standard custom screw, it is designed with versatility in mind. The outer hexagonal part is compatible with standard wrenches or sockets, and the inner semicircular groove needs to be used with specific cylindrical tooling. This dual design provides customers with different options for on-site repairs and automated assembly lines.

 

Q: How to purchase large quantities of non-standard customized screws? What is the minimum order quantity?

A: We have a flexible production system. For stock specifications of high-strength hexagonal non-standard blue screws, a small quantity is supported; for non-standard custom screws that require mold customization, the minimum order quantity is usually based on the diameter and complexity of the screw. Please consult our technical sales engineers for details.

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