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China Hexagonal Self-Drilling Screws Suppliers - High Torque Factory Fasteners for Metal Applications
📐 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 Functions
- 🏗️ 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, construction, and automotive assembly. They provide firm mechanical fixation and are suitable for both thin plate materials and structural reinforcement applications.
Q
What thread sizes 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 different application requirements.
Q
Why is a hexagonal head design preferred for drill screws?
The hexagonal head design allows for easier and more secure tightening using torque tools such as wrenches or torque wrenches. It is also less prone to stripping or breaking compared to other head designs, making it ideal for high-torque applications.
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 has a minimum drilling depth of 0.7 mm and a maximum of 1.9 mm, while ST6.3 supports up to 6 mm maximum thickness, making them suitable for a wide variety of material gauges.
Q
Are these screws suitable for applications that require frequent tightening and loosening?
Yes. Hexagonal self-drilling screws are specifically designed for situations where firm fixation is required along with the ability to be tightened and loosened repeatedly without compromising the integrity of the connection.
Q
What does the color galvanized coating provide?
The color galvanized coating provides enhanced corrosion resistance, protecting the screws from rust and environmental exposure. It also offers a visually distinctive finish that can be used for color-coding or aesthetic purposes in construction and decoration projects.