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Hexagonal Self-Drilling Screws from China Factory – High Torque Fasteners Suppliers 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
- 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?
A
Hexagonal self-drilling screws are widely used in carpentry, metalworking, and construction work. They are ideal for fastening thin plate materials, reinforcing building structures, fixing decorative elements, securing mechanical equipment, assembling automotive components, and general construction industry installations.
Q
What thread specifications are available for these hexagonal drill screws?
A
These screws are available in six standard thread specifications: ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3, with pitches ranging from 1.1mm to 1.8mm to suit a variety of application requirements.
Q
Why is a hexagonal head design preferred over other head designs?
A
The hexagonal head design allows for easier tightening with torque tools such as wrenches or torque wrenches. It provides better grip and is less likely to strip or break compared to other head designs, making it ideal for applications requiring firm fixation and frequent tightening or loosening.
Q
What is the maximum drilling depth for these screws?
A
The maximum drilling depth varies by thread size. For ST2.9, the maximum is 1.9mm; for ST3.5 it is 2.25mm; ST4.2 allows up to 3mm; ST4.8 up to 4.4mm; ST5.5 up to 5.25mm; and ST6.3 up to 6mm.
Q
Are color galvanized hexagonal self-drilling screws suitable for outdoor use?
A
Yes. The color galvanized coating provides corrosion resistance, making these screws suitable for both indoor and outdoor applications, including construction and structural work that may be exposed to moisture or varying weather conditions.
Q
How do I choose the right thread size for my project?
A
Choosing the right thread size depends on the material thickness and load requirements of your project. Refer to the thread specifications table above — key parameters such as drilling depth range, head size (k), and wrench size (s) will help you select the appropriate screw size for your specific application.