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China Hexagonal Self-Drilling Screws Suppliers - High Strength Factory Fasteners for Metal Applications
| 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:
- ✔ Fixation of Thin Plate Materials for Simple Buildings
- ✔ Building structure reinforcement and support
- ✔ Building Decoration Fixation
- ✔ Mechanical equipment fixation
- ✔ Automotive component assembly
- ✔ Installation in the construction industry
❓ Frequently Asked Questions
Q What are color galvanized hexagonal self-drilling screws primarily used for?
A They are widely used in carpentry, metalworking, and construction for secure mechanical fixation. Common applications include thin plate fixation for simple buildings, structural reinforcement, building decoration, and mechanical or automotive equipment assembly.
Q What thread size options are available for hexagonal self-drilling screws?
A These screws are available in six standard thread specifications: ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3. Each size corresponds to specific pitch, head diameter, and drilling depth ranges as detailed in the specification table above.
Q What tools are needed to install hexagonal self-drilling screws?
A Hexagonal self-drilling screws are designed for use with torque tools such as a standard wrench or torque wrench. Their hexagonal head provides a reliable gripping surface, enabling efficient installation and removal without slippage.
Q What is the advantage of a hexagonal head design over other screw head types?
A The hexagonal head allows for higher torque to be applied during installation, significantly reducing the risk of head stripping or screw breakage. It is also better suited for applications that require frequent tightening and loosening over the product's service life.
Q What sheet metal thickness is compatible with these screws?
A The compatible sheet metal thickness varies by screw size. For instance, ST2.9 works with material 0.7–1.9 mm thick, while ST6.3 is suitable for 2–6 mm. Always match the screw size to the correct material thickness using the specification table.
Q What does "color galvanized" mean and what benefits does it offer?
A "Color galvanized" refers to a zinc-based surface coating applied to the screw, often combined with a colored finish. This treatment enhances corrosion resistance, extends service life, and improves appearance, making the screws suitable for both indoor and outdoor use.