Hexagonal Internal And External Thread Self-Tapping Screws

Product introduction

This product innovatively combines the dual drive modes of external hexagonal and "one-line" slotting, and has both self-tapping locking and nut connection functions. The outer teeth adopt high-precision self-tapping threads, which can be directly locked in without pre-tapping; the inner teeth are designed to facilitate subsequent stacking installation. The newly added slotted head design can be operated with a screwdriver when no wrench tool is available, adapting to assembly in small spaces.

 

The threads of the product are pre-coated with an anti-loosening rubber layer, which has excellent shock-resistant sealing effect. For special working conditions, our company can provide customized non-standard screw services and support the development of various special-shaped screws and non-standard specifications. Whether it is automotive electronics or precision instruments, we can provide you with reliable customized non-standard screw solutions through strict quality control.

 

Product design and features

Dual-mode drive head design:

Innovatively, on the basis of the standard external hexagonal head, a straight or cross slot is added. This design gives great flexibility in installation: you can use a wrench or socket for high-torque fast locking, and when space is limited and a wrench tool cannot be used, you can directly use a screwdriver to operate, which greatly improves the convenience of assembly.

 

Composite thread structure:

External thread (self-tapping thread): It adopts special thread shapes such as triangular thread or high and low thread, and has excellent self-drilling and self-tapping performance. It can directly form internal threads on plastic, thin plates or metal bottom holes, eliminating the need for pre-tapping processes.

Internal thread (nut function): There is a precision internal thread in the center of the screw head, which is equivalent to integrating a nut on the top of the screw. This "stud + nut" integrated design perfectly solves the problem of subsequent equipment stacking or vertical locking of components.

 

Pre-coated anti-loosening technology:

The threads are pre-coated with high-performance nylon coating. When locked, they are compressed to generate strong friction, achieving permanent anti-loosening and shock resistance. There is no need to apply glue on site, making it clean and efficient.

 

Materials and application fields

Commonly used materials:

Carbon steel (10B21, 45# steel): high strength, economical cost, suitable for indoor environments, the surface can be treated with environmentally friendly galvanizing, Dacromet, etc.

Stainless steel (304, 316): Excellent corrosion resistance, suitable for humid or corrosive environments such as outdoor, chemical industry, and ships.

 

Application areas:

Automotive industry: fixing of door trim panels, lights and interior parts.

Electronic appliances: Isolation support and connection for home appliance casings and PCB boards.

Photovoltaic and new energy: battery pack casing, inverter installation.

Sheet metal and chassis: laminate support for server cabinets and control boxes.

Especially in high-end equipment with limited space and complex stress conditions, we provide customized non-standard screw services, which can perfectly replace the cumbersome welding nut process and achieve precise connections.

 

Quality control and certification system

Raw material control: All steel entering the factory comes with a material certificate and is subject to spectral analysis and review.

Forming and thread control: Precision cold heading forming technology is used to ensure the geometric dimensions of the special-shaped screw head are accurate, especially the groove depth and the accuracy of the outer hexagonal edge alignment. After the thread is formed, the ring gauge and pass-stop gauge are tested to ensure stable self-tapping performance.

Glue coating process: Through automated glue coating equipment, the glue coating position, glue amount and number of rubber rings are precisely controlled, and a 24-hour anti-loosening torque test is performed.

 

Certification system:

Passed ISO 9001 quality management system certification.

Comply with RoHS & REACH environmental protection directives to ensure that products can be exported to the EU.

Supports the issuance of third-party material testing reports and salt spray test reports.

 

Customized services

Size customization: According to the bottom hole thickness and hole diameter, the screw length, tooth pitch and internal and external tooth specifications are accurately calculated and customized.

Head type/slot type customization: In addition to standard external hexagon + slotting, we can design the head as a flange surface, knurled head, or develop special-shaped screws such as hexagonal star, hexagon socket, etc. to adapt to specific installation tools or spaces.

Customized glue coating: Nylon glue, anaerobic glue or silicone gel with different solvents can be selected according to the working temperature (-50℃ to +150℃).

Non-standard development: If you can't find a suitable product, please send us the drawings or samples. Our team of engineers will develop non-standard screw molds from scratch for you to realize your unique design.

 

FAQ

Q: Can your company produce non-standard special-shaped internal and external thread screws?

A: Absolutely. This is one of our core strengths. Whether your drawing has a polygonal special-shaped head, a special thread angle, or a non-standard inner hole depth, we can produce high-quality customized non-standard screws for you through precision mold design and cold heading technology.

 

Q: Will pre-glued screws fall off during transportation? Is the anti-loosening effect long-lasting?

A: Please rest assured that our pre-coated adhesive layer has been firmly attached to the threads after drying and will not fall off during normal packaging and transportation. The glue layer has memory and can maintain good locking force even after repeated disassembly and assembly. The colloid has good oil resistance and temperature resistance, ensuring a stable anti-loosening effect during the entire life cycle of the equipment.

 

Q: How to choose the appropriate material? Does the slotted design affect strength?

A: Material selection mainly depends on the working environment. For ordinary indoor dry environments, you can choose galvanized carbon steel; for outdoor or humid environments, it is strongly recommended to choose stainless steel. Regarding strength, our slotted design is precision machined while ensuring head strength, and has been verified by torque testing to fully meet standard application requirements.

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