| Thread specifications |
ST2.2 |
ST2.9 |
ST3.5 |
ST4.2 |
ST4.8 |
ST5.5 |
ST6.3 |
ST8 |
ST9.5 |
| P |
Pitch |
0.8 |
1.1 |
1.3 |
1.4 |
1.6 |
1.8 |
1.8 |
2.1 |
2.1 |
| a |
Max |
1.6 |
2.2 |
2.6 |
2.8 |
3.2 |
3.6 |
3.6 |
4.2 |
4.2 |
| dk |
Max |
3.8 |
5.5 |
7.3 |
8.4 |
9.3 |
10.3 |
11.3 |
15.8 |
18.3 |
| Min |
3.5 |
5.2 |
6.9 |
8 |
8.9 |
9.9 |
10.9 |
15.4 |
17.8 |
| k |
Max |
1.1 |
1.7 |
2.35 |
2.6 |
2.8 |
3 |
3.15 |
4.65 |
5.25 |
| Slot Number |
0 |
1 |
2 |
2 |
2 |
3 |
3 |
4 |
4 |
| M1 |
Cruciform |
1.9 |
3.2 |
4.4 |
4.6 |
5.2 |
6.6 |
6.8 |
8.9 |
10 |
| M2 |
Zigzag slot |
2 |
3 |
4.1 |
4.4 |
4.9 |
6.3 |
6.6 |
8.8 |
9.8 |
| y |
Reference value |
Type C |
2 |
2.6 |
3.2 |
3.7 |
4.3 |
5 |
6 |
7.5 |
8 |
| Type F |
1.6 |
2.1 |
2.5 |
2.8 |
3.2 |
3.6 |
3.6 |
4.2 |
4.2 |
| Type R |
/ |
/ |
2.7 |
3.2 |
3.6 |
4.3 |
5 |
/ |
/ |
★
How to choose a suitable self tapping screw
01
Select by material
Select different self tapping screws based on the material characteristics that need to be nailed in. For example, for hard materials, choose self tapping screws with high strength, appropriate length and diameter.
02
According to thread selection
Self tapping screws usually have two types: coarse thread and fine thread, and different threads are usually suitable for different materials.
03
Select according to the shape of the head
The pentagonal head self tapping screw is more sturdy than the ordinary round head self tapping screw, but the price is also relatively high.
Frequently Asked Questions
What size ranges are available for these self-tapping screws?
According to our specifications, we provide a wide range from ST2.2 to ST9.5 to accommodate various industrial needs.
How do I determine the correct pitch (P) for my application?
The pitch varies based on the screw size, ranging from 0.8 for ST2.2 up to 2.1 for ST9.5. Finer pitches are typically used for more precise applications.
What is the difference between Type C, Type F, and Type R?
These refer to the reference values for different point styles, ensuring the screw performs optimally based on the penetration requirements of the material.
Why should I consider head shape when choosing a screw?
Head shape affects both the aesthetic finish and the structural integrity. For instance, pentagonal heads offer superior sturdiness compared to standard round heads.
Are these screws suitable for high-strength materials?
Yes, when selecting for hard materials, ensure you choose screws with high strength and appropriate diameter as per the technical table provided.
What slot types are supported for these screws?
Our technical specifications cover both Cruciform (M1) and Zigzag (M2) slot types to support different driving tools and torque requirements.
Dongshuo Fastener
