Non-Standard Screw With Head Sunk And Hexagonal Shape And Glue Coating

Product introduction

This product is a typical non-standard screw. The head adopts a countersunk head design and is flush with the surface of the workpiece after installation. The internal hexagonal drive method can withstand high torque and is not easy to slip. The threaded parts are pre-coated with anti-loosening glue to provide stable anti-loosening performance and are resistant to vibration and impact.

As special-shaped screws, the products are made of carbon steel, stainless steel or alloy steel, with performance levels ranging from 4.8 to 12.9. They are widely used in electronic equipment, automobile manufacturing, precision machinery and other scenarios that require high anti-loosening requirements.

We focus on customized non-standard screw solutions. The size, head shape, glue application position and glue type can all be customized according to the drawings. Supports small batch samples and large batch supply. Welcome to inquire about anti-loosening solutions.

 

Product design and features

The countersunk head hexagonal rubber-coated screw is a high-performance fastener that combines anti-loosening, beautiful appearance and high torque transmission. The head adopts a countersunk head (flat head) design, which can be completely embedded in the surface of the workpiece after installation to keep the surface smooth; the driving method is an internal hexagonal groove, which can withstand large tightening torque; the threaded parts are pre-coated with anti-loosening glue to achieve reliable anti-loosening function.

 

This product is a typical non-standard screw. Its main features include:

Countersunk head design: The head has a countersunk head angle of 90° or 82°. After installation, it will be flush with the surface of the workpiece without protrusions. It is suitable for occasions where surface smoothness is required;

Inner hexagonal drive: The hexagonal groove is evenly stressed, has high torque transmission efficiency and is not easy to slip. It is suitable for automated assembly and high-torque fastening;

Pre-coated anti-loosening glue: The thread surface is pre-coated with engineering anti-loosening glue (such as nylon glue, anaerobic glue, etc.). After curing, it provides stable anti-loosening torque and can be reused 2-3 times;

Stable anti-loosening performance: resistant to vibration and impact, suitable for connection parts that bear dynamic loads for a long time;

Integrated functions: Integrate the three functions of countersunk head, hexagonal drive, and pre-coated anti-loosening into one, simplifying the assembly process.

As a special-shaped screw, its structural design takes into account both aesthetic appearance and functional reliability. It is widely used in precision equipment with high requirements for anti-loosening.

 

Materials and application fields

Countersunk head hexagonal rubber-coated screws are made of high-quality materials. The material characteristics are as follows:

Carbon steel (10#, 45#, 35K, 10B21, etc.): has good comprehensive mechanical properties and can be heat treated to high strength grades (grade 8.8, grade 10.9, grade 12.9);

Stainless steel (304, 316, 410, etc.): has excellent corrosion resistance and is suitable for humid and corrosive environments;

Alloy steel (SCM435, etc.): the preferred material for high strength grades, suitable for heavy-duty connections;

Surface treatment: Various options such as galvanized, nickel plated, blackened, Dacromet, and stainless steel can be provided according to requirements;

Type of anti-loosening glue: Nylon anti-loosening glue (temperature resistance -50°C to +120°C) or anaerobic adhesive (temperature resistance -55°C to +150°C) can be selected according to the use environment.

 

As a non-standard screw, it has a wide range of applications

Electronic equipment: such as mobile phone casings, laptop computers, precision instruments and other products that require high surface flatness;

Automobile manufacturing: engine periphery, gearbox, chassis and other key parts that are subject to vibration loads;

Mechanical equipment: fastening connections of machine tools, robots, and automation equipment;

Aerospace: avionics equipment and structural parts with extremely high anti-loosening requirements;

Medical instruments: medical instruments and surgical equipment that need to be anti-loose and have a flat surface;

New energy: electric vehicle battery modules, charging pile internal connectors.

 

Quality control and certification system

Since the countersunk head hexagonal rubber-coated screws are customized non-standard screws, their production process implements a strict customized quality control system:

Raw material control: All materials are accompanied by material certificates, and the composition is verified by a spectrum analyzer to ensure compliance with standard requirements;

Dimensional accuracy control: Key dimensions (countersunk angle, head diameter, hexagonal size, thread accuracy, total length) are fully inspected or AQL spot-checked using professional measuring tools such as image measuring instruments, pass-and-stop gauges, and thread gauges;

Mechanical property testing: including tensile strength, yield strength, hardness, and torque testing to ensure that the performance levels specified by the customer are met;

 

Glue coating quality control:

Glue coating position accuracy: ensure that the anti-loosening glue is coated on the designated thread section;

Glue amount control: Precisely control the amount of glue through automated glue coating equipment to ensure the consistency of the anti-loosening torque;

Verification of curing effect: Conduct anti-loosening torque test for each batch to ensure compliance with customer requirements;

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

 

FAQ

Q: What is the difference between countersunk head hexagon socket screws and ordinary countersunk head screws?

A: Ordinary countersunk head screws only have the function of countersunk head embedment; while rubber-coated screws are pre-coated with anti-loosening glue on the threaded parts to provide stable anti-loosening torque after installation, effectively preventing vibration and loosening, and belong to the category of screws with special shapes.

 

Q: Can anti-loosening glue be reused?

A: Nylon anti-loosening glue can usually be reused 2-3 times, and the anti-loosening effect is still better than that of ordinary screws. The anti-loosening effect of anaerobic adhesive will be significantly reduced after disassembly, so it is recommended to replace the screws with new ones. If you need to disassemble and assemble multiple times, you can choose the nylon glue solution when customizing.

 

Q: How to ensure the accuracy of the glue application position?

A: We use automated gluing equipment to accurately locate the starting and ending points of gluing through sensors, and use image measuring instruments to check the gluing position and length before shipment to ensure the consistency of each batch of products.

 

Q: Are rubberized screws suitable for high temperature environments?

A: The applicable temperature range of nylon anti-loosening adhesive is -50℃ to +120℃, and the applicable temperature range of anaerobic adhesive is -55℃ to +150℃. If higher temperature resistance is required, epoxy glue or inorganic anti-loosening coating solutions can be customized.

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