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China Suppliers Factory Color Galvanized Hexagonal Self-Drilling Screws for Metal and Plate 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:
- 1Fixation of Thin Plate Materials for Simple Buildings
- 2Building structure reinforcement and support
- 3Building Decoration Fixation
- 4Mechanical equipment fixation
- 5Automotive component assembly
- 6Installation in the construction industry
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Frequently Asked Questions
QWhat are color galvanized hexagonal self-drilling screws used for?
Color galvanized hexagonal self-drilling screws are widely used in carpentry, metalworking, and construction. They are ideal for securing thin plate materials, reinforcing building structures, fixing mechanical equipment, assembling automotive components, and various construction installation tasks.
QWhat is the benefit of the color galvanized coating?
The color galvanized coating provides excellent corrosion and weather resistance, significantly extending the screw's service life in demanding environments. The color also enables quick visual identification and easy categorization during storage and on-site installation.
QWhy is a hexagonal head design preferred over other head types?
The hexagonal head allows a standard wrench or torque wrench to apply significantly greater torque, resulting in firmer and more secure fastenings. Compared to slotted or Phillips head designs, hexagonal heads are far less prone to stripping or breaking under high torque, making them ideal for heavy-duty applications.
QHow do I select the correct thread size for my application?
Choose based on material thickness and load requirements. Smaller sizes such as ST2.9 and ST3.5 suit thin sheet metal up to approximately 2.25mm, while larger sizes like ST5.5 and ST6.3 are designed for thicker materials up to 6mm and heavier structural loads.
QWhat is the maximum drilling depth for each thread size?
Maximum drilling depths by size — ST2.9: 1.9mm; ST3.5: 2.25mm; ST4.2: 3mm; ST4.8: 4.4mm; ST5.5: 5.25mm; ST6.3: 6mm. Always match the screw size to your material thickness to ensure optimal holding performance.
QAre these screws suitable for applications requiring repeated tightening and loosening?
Yes. These hexagonal self-drilling screws are specifically designed for use cases where frequent tightening and loosening is required. Their robust construction maintains strong holding power across multiple installation and removal cycles without compromising fastening integrity.