Details
This creation is one kind of screw structure. The screw is equipped with the forehead which extends is equipped with a rod. The terminal of the rod is equipped with a pointed cone. Around the rod, the pointed cone is surrounded by spiral teeth to the forehead. The section of the pointed cone show the polygon which is peeled to become an arc. That becomes many sections by peeling. There are continuous sharp sections. When the screw digs things, it will show the great effect of multiple sections by peeling. Takes advantage of this, it will be easy and efficient to fix a screw in a thing. Besides, it makes operators to be more relaxed and reduce to crack.
| Patent sharp serrated teeth four special screws |
| |
Diameter |
3.5 |
4.0 |
5.0 |
6.0 |
| D1 |
Teeth Outside Diameter |
3.30~3.60 |
3.80~4.10 |
4.80~5.10 |
5.80~6.10 |
| dk |
Head diameter |
6.70~7.10 |
7.70~8.10 |
9.70~10.10 |
11.60~12.10 |
| ds1 |
Teeth Inside Diameter |
2.20±0.12 |
2.50±0.12 |
3.00±0.12 |
3.80±0.15 |
| ds2 |
4 Angle inside Diameter |
2.50±0.10 |
2.90±0.10 |
3.40±0.12 |
4.20±0.15 |
| ds3 |
<35mm |
5 ~ 7 mm |
5 ~ 7 mm |
5 ~ 7 mm |
5 ~ 7 mm |
| >40mm |
7 ~ 9 mm |
7 ~ 9 mm |
7 ~ 9 mm |
7 ~ 9 mm |
| r |
Needle depth |
>1.60 |
>1.70 |
>2.00 |
>2.20 |
| Torque (kg) |
21 kg |
31 kg |
64 kg |
120 kg |
| Surface hardness : 550 - 800 HV0.3 |
| Screw attack speed test |
| Material : C-1022 |
