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China Hexagonal Self-Drilling Screws Factory - High Torque and Strong Fixation Suppliers
Thread Specifications
| 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
- 1 Fixation of Thin Plate Materials for Simple Buildings
- 2 Building Structure Reinforcement and Support
- 3 Building Decoration Fixation
- 4 Mechanical Equipment Fixation
- 5 Automotive Component Assembly
- 6 Installation in the Construction Industry
Frequently Asked Questions
Q What are hexagonal self-drilling screws used for?
Hexagonal self-drilling screws are widely used in carpentry, metalworking, and construction work where mechanical fixing is required. They are ideal for securing thin plate materials, structural reinforcement, building decoration, mechanical equipment, automotive assembly, and general construction installation.
Q What thread sizes are available for hexagonal drill screws?
Hexagonal drill screws are available in a range of thread sizes including ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3, each with specific pitch, head dimensions, and drilling depth to suit different application requirements.
Q Why is the hexagonal head design preferred over other head types?
The hexagonal head design allows for easier torque application using standard wrenches or torque wrenches. It provides a stronger grip and is less likely to strip or break compared to other head designs, making it especially suitable for applications requiring frequent tightening and loosening.
Q What is the drilling depth range for these screws?
The drilling depth (or sheet metal thickness) varies by screw size. For example, ST2.9 supports a minimum of 0.7mm and a maximum of 1.9mm, while ST6.3 supports a minimum of 2mm and a maximum of 6mm. Please refer to the specification table for full details per size.
Q What does "color galvanized" mean for these screws?
Color galvanized refers to a zinc-based coating applied to the screw surface, which provides corrosion resistance and durability. The color coating also allows for easy identification and aesthetic matching in visible installation areas.
Q Can hexagonal self-drilling screws be used in both metal and wood materials?
Yes, hexagonal self-drilling screws are versatile fasteners suitable for use in both metal and wood materials. They are especially effective in thin sheet metal applications and lightweight structural assemblies where pre-drilling is not required.