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China Hexagonal Self-Drilling Screws Suppliers | Factory Direct High Torque Fastening Solutions
| Thread specifications | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | |
| P | Pitch | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a | Max | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| dc | Max | 6.3 | 8.3 | 8.8 | 10.5 | 11 | 13.5 |
| Min | 5.8 | 7.6 | 8.1 | 9.8 | 10 | 12.2 | |
| c | Min | 0.4 | 0.6 | 0.8 | 0.9 | 1 | 1 |
| s | Maximum = nominal | 4 | 5.5 | 7 | 8 | 8 | 10 |
| Min | 3.82 | 5.32 | 6.78 | 7.78 | 7.78 | 9.78 | |
| e | Min | 4.28 | 5.96 | 7.59 | 8.71 | 8.71 | 10.95 |
| k | Maximum = nominal | 2.8 | 3.4 | 4.1 | 4.3 | 5.4 | 5.9 |
| Min | 2.5 | 3 | 3.6 | 3.8 | 4.8 | 5.3 | |
| kw | Min | 1.3 | 1.5 | 1.8 | 2.2 | 2.7 | 3.1 |
| r | Min | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 |
| Drilling depth or sheet metal thickness | Min | 0.7 | 0.7 | 1.75 | 1.75 | 1.75 | 2 |
| Max | 1.9 | 2.25 | 3 | 4.4 | 5.25 | 6 | |
| LG (minimum) | - | - | - | - | - | ||
Hexagonal drill screws are commonly used in places where mechanical fixing is required, such as carpentry, metalworking, and construction work. Their hexagonal head design makes them easier to secure with torque tools, such as a wrench or torque wrench, and less likely to break than other head designs. This type of screw can be used where it is necessary to ensure a firm fixation and where frequent tightening and loosening is required
Its function:
- 1Fixation of Thin Plate Materials for Simple Buildings
- 2Building structure reinforcement and support
- 3Building Decoration Fixation
- 4Mechanical equipment fixation
- 5Automotive component assembly
- 6Installation in the construction industry
Frequently Asked Questions
QWhat are hexagonal self-drilling screws commonly used for?
Hexagonal self-drilling screws are widely used in carpentry, metalworking, and construction. Key applications include fixing thin plate materials in simple buildings, reinforcing structural components, securing decorative elements, and assembling mechanical and automotive parts.
QWhat does "ST" mean in the thread specification (e.g., ST4.2)?
"ST" stands for Sheet metal Thread. The number following ST indicates the nominal outer diameter of the screw thread in millimeters. For example, ST4.2 has a thread outer diameter nominally around 4.2 mm, making it suitable for specific sheet metal thicknesses as shown in the specification table.
QHow do I select the correct screw size for my material thickness?
Match the screw's listed drilling depth range to your material's thickness. For instance, ST2.9 is designed for sheet metal between 0.7 mm and 1.9 mm thick, while ST6.3 handles materials up to 6 mm thick. Always verify the Min and Max drilling depth values in the specification table before selecting a size.
QWhat tools are recommended for installing hexagonal self-drilling screws?
A standard wrench or torque wrench is recommended for precise torque control. The hexagonal head design provides a secure grip and is far less prone to cam-out or stripping compared to slotted or Phillips heads. Power tools fitted with a matching hex socket bit are also suitable for high-volume installation.
QWhat are the benefits of color galvanized coating on these screws?
Color galvanizing provides a zinc-based protective layer that resists corrosion and oxidation, extending the service life of the screw in humid or outdoor environments. The color coating also serves as a visual identifier, helping workers quickly distinguish between different sizes or specifications during installation.
QCan hexagonal self-drilling screws be removed and reinstalled multiple times?
Yes. One of the key advantages of the hexagonal head design is its ability to withstand repeated tightening and loosening without deforming. This makes hexagonal self-drilling screws well-suited for applications that require periodic maintenance, inspection, or component replacement.