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Product Name: 4-points special screw Material:C - 1022 
Length: Surface hardness:500 - 800 HV0.3

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