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| 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 wherever mechanical fixing is required. They are ideal for securing thin plate materials, building structures, decorative elements, and mechanical equipment.
Q
What thread sizes are available for hexagonal drill screws?
Hexagonal drill screws are available in thread sizes ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3, with pitches ranging from 1.1 mm to 1.8 mm depending on the size selected.
Q
Why is a hexagonal head design preferred over other head designs?
The hexagonal head design allows for easier tightening and loosening using torque tools such as a wrench or torque wrench. It also distributes torque more evenly, reducing the risk of the head stripping or breaking compared to other head designs.
Q
What is the maximum drilling depth for these screws?
The maximum drilling depth varies by thread size. For example, ST2.9 has a maximum drilling depth of 1.9 mm, while ST6.3 supports up to 6 mm. Please refer to the thread specification table above for full details per size.
Q
Are these screws suitable for automotive applications?
Yes, hexagonal self-drilling screws are suitable for automotive component assembly. Their secure fastening capability and resistance to loosening under vibration make them a reliable choice for automotive manufacturing and repair.
Q
Can hexagonal drill screws be repeatedly tightened and loosened?
Yes, one of the key advantages of hexagonal drill screws is their suitability for applications requiring frequent tightening and loosening. Their robust head design maintains integrity through repeated use, making them ideal for maintenance-heavy installations.