Hot Products
0102030405
China Suppliers Factory Cross Galvanized Flat Head Self Tapping Screws for Fastener Processing and Customization
📐 Thread Specifications
| Thread specifications d |
ST2.2 | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | ||
| P | Pitch | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |
| a | Max | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |
| dk | Max | 3.7 | 5.3 | 6.64 | 7.64 | 9.14 | 10.57 | 11.57 | |
| Min | 3.4 | 5 | 6.28 | 7.28 | 8.78 | 10.14 | 11.14 | ||
| k | Max | 1.6 | 2.4 | 2.6 | 3.1 | 3.7 | 4 | 4.6 | |
| Min | 1.4 | 2.15 | 2.35 | 2.8 | 3.4 | 3.7 | 4.3 | ||
| dc | h15 | Max | 5 | 7 | 8 | 9 | 10 | 12.5 | 14 |
| Min | 4.52 | 6.42 | 7.42 | 8.42 | 9.42 | 11.8 | 13.3 | ||
| s | Min | 0.3 | 0.5 | 0.8 | 0.8 | 0.8 | 1 | 1 | |
| y | C type | 2 | 2.6 | 3.2 | 3.7 | 4.3 | 5 | 6 | |
| F, FT type | 1.6 | 2.1 | 2.5 | 2.8 | 3.2 | 3.6 | 3.6 | ||
| Slot Number | 0 | 1 | 2 | 2 | 2 | 3 | 3 | ||
| M | ≈ | 1 | 3 | 3.9 | 4.4 | 4.9 | 6.4 | 6.9 | |
| Insert depth / maximum | 0.85 | 1.4 | 1.4 | 1.9 | 2.4 | 2.6 | 3.1 | ||
| Insert depth / minimum | 1.2 | 1.8 | 1.9 | 2.4 | 2.9 | 3.1 | 3.6 | ||
⚙️ Key Features & Advantages
🔩
Good Fastening Performance
Made of high-strength materials, these screws effectively tighten different components together and maintain the stability of the equipment.
🔧
Easy to Disassemble
The special head design allows easy tightening or disassembly using a screwdriver, saving the step of pre-punching and making it more convenient and time-saving.
🛡️
Strong Corrosion Resistance
Made of high-quality materials with a black galvanized oxide film surface treatment, providing excellent rust and anti-corrosion effects for long-term use in harsh environments.
📦
Simple Structure
Composed of the head, shaft, and threaded parts — easy to manufacture and use.
🌐
Widely Applicable
Broad range of applications including mechanical equipment, building structures, furniture manufacturing, electronic products, and aerospace fields.
💪
Greater Strength
The flat cross-shaped head enables better engagement with the base material, offering greater load-bearing capacity and superior tensile and shear resistance compared to traditional screws.
🔒
Higher Stability
The flat cross-shaped head makes the connection more stable and reliable, significantly reducing the possibility of loosening over time.
❓ Frequently Asked Questions
Q
What is a cross galvanized flat head self-tapping screw?
A cross galvanized flat head self-tapping screw is a mechanical fastener featuring a cross (Phillips) drive head and a galvanized surface finish. It is designed to tap its own thread into materials such as metal, wood, or plastic without requiring a pre-drilled pilot hole, making installation fast and efficient.
Q
What thread sizes are available for these self-tapping screws?
These screws are available in a range of standard thread sizes: ST2.2, ST2.9, ST3.5, ST4.2, ST4.8, ST5.5, and ST6.3, with pitches ranging from 0.8mm to 1.8mm to suit various application requirements.
Q
What surface treatment is applied to these screws for corrosion resistance?
These screws undergo a galvanizing process that forms a black galvanized oxide film on the surface. This treatment provides excellent rust prevention and anti-corrosion protection, making them suitable for use in demanding or outdoor environments.
Q
What are the main application fields for cross galvanized flat head self-tapping screws?
These screws are widely used across many industries, including mechanical equipment assembly, building and construction structures, furniture manufacturing, consumer electronics, and even aerospace applications due to their high strength and reliable fastening performance.
Q
How does the flat cross-shaped head improve connection strength compared to standard screws?
The flat cross-shaped head design allows the screw to better engage with the base material, distributing load more evenly. This results in greater tensile and shear resistance, higher load-bearing capacity, and a more stable, reliable connection that is less prone to loosening under vibration or stress.
Q
Do these self-tapping screws require pre-drilling before installation?
No, one of the key advantages of self-tapping screws is that they do not require a pre-drilled hole. They are engineered to cut or form their own threads directly into the material during installation, saving time and simplifying the assembly process.