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China Hexagonal Self-Drilling Screws Factory - High Strength 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
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 used for?
Color galvanized hexagonal self-drilling screws are widely used in carpentry, metalworking, and construction applications. They are ideal for fixing thin plate materials, reinforcing building structures, securing decorative elements, and assembling mechanical or automotive components.
Q
What thread specifications are available for hexagonal self-drilling screws?
These screws are available in a range of thread specifications including ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3, with pitches ranging from 1.1 mm to 1.8 mm to suit various application requirements.
Q
Why is a hexagonal head design preferred for self-drilling screws?
The hexagonal head design allows for easier and more secure tightening using torque tools such as a wrench or torque wrench. It distributes force more evenly, reducing the risk of stripping or breaking compared to other head designs, especially in high-torque applications.
Q
What drilling depth or sheet metal thickness is compatible with these screws?
The compatible sheet metal thickness varies by screw size. For example, ST2.9 supports a range of 0.7 mm to 1.9 mm, while ST6.3 is suitable for thicknesses from 2 mm up to 6 mm. Always refer to the specification table to match the correct screw size to your material thickness.
Q
Are these screws suitable for frequent tightening and loosening?
Yes. Hexagonal self-drilling screws are specifically designed to handle repeated tightening and loosening cycles. Their robust head geometry and thread design maintain holding strength even after multiple removal and re-installation operations.
Q
What does the color galvanized coating provide?
The color galvanized coating provides corrosion resistance, protecting the screws from rust and environmental degradation. It also offers an aesthetic benefit, making the screws suitable for visible installations in building decoration and architectural applications.