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6 Lobe Countersunk Head Thread Forming Screw for Plastic

SKU: TFS03 Category:

FasPLas thread forming screw for plastic for fixing into moulded or pre drilled hole. Available with a 30° or 45° flank angle and countersunk 6 lobe head for excellent screwdriver bit engagement.

  • 6 lobe drive to resist cam out
  • Choice of diameter and length
  • Manufactured in steel with zinc or black coating. Also available in stainless steel
  • Thread designed for use in soft materials like plastic

The flank angle allows the screw to slice through the plastic to maximise engagement with the material. This type of thread offers the highest pull performance to ensure a positive fixing.  The 6 lobe or Torx head ensures that the maximum torque can be imparted to the fixing.

All stocked sizes are listed below. FasPlas 30°/45° Countersunk 6 Lobe screws are available to order in non-standard sizes and finishes, including small volume manufacture, modifications and custom parts to drawings.

30° Flank Angle 45° Flank Angle
Diameter /
Length (mm)
2.2 2.5 3 3.5 4 5 6 2.2 2.5 3 3.5 4 5 6
5  prod-tri-spacer  prod-tri-spacer prod-tri-spacer
6 prod-tri-blue-single prod-tri-blue-black prod-tri-blue-red prod-tri-blue-single prod-tri-blue-red prod-tri-blue-red
8 prod-tri-blue-single prod-tri-blue-black-red prod-tri-red-single prod-tri-blue-single prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red
10 prod-tri-blue-single prod-tri-blue-black-red prod-tri-blue-red prod-tri-blue-red prod-tri-red-single prod-tri-blue-single prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-single
12 prod-tri-blue-black-red prod-tri-blue-black-red prod-tri-blue-black-red prod-tri-red-single prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-single
14
16 prod-tri-blue-black-red prod-tri-blue-single prod-tri-blue-black-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-single
18
20 prod-tri-blue-single prod-tri-blue-single prod-tri-blue-single prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-single
25 prod-tri-red-single prod-tri-blue-single prod-tri-blue-single prod-tri-blue-single
30 prod-tri-red-single prod-tri-blue-single
Zinc finish= Zinc
prod-tri-black-inverted = Black Zinc
Stainless steel finish = Stainless Steel

Thread Forming Screws – Design Considerations

When specifying thread forming screws for plastics, these factors should be considered:

  • Hole size and design
  • Type, grade and thickness of plastic
  • Installation depth
  • Required application and strip out performance

Standard dimensions are as below, although additional sizes and custom made thread forming screws are available.

tx-csk-30tx-csk-45

30° Flank Angle 45° Flank Angle
D Diameter 2.2 2.5 3 3.5 4 5 6 2.5 3 3.5 4 5
D1 – max 3.80 4.70 5.50 7.30 8.40 9.30 11.30 4.4 5.5 6.3 7.35 8.4
K 1.30 1.75 2.05 2.80 3.25 3.40 3.80 1.3 1.5 1.65 1.9 2.2
Recess 1 1 1 2 2 2 2 T6 T8 T10 T15 T20