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Phillips Countersunk Head Thread Forming Screw for Plastic

SKU: TFS04 Category:

FasPLas thread forming screw for plastic, with 30° thread flank angle and countersunk Philips head, for installation into pre-drilled or moulded holes.

  • Range of diameters and thread lengths
  • Phillips drive
  • Manufactured in zinc or black plated steel. Also available in stainless steel
  • Reduced installation torque, less risk of over tightening and reduced radial stress on the plastic

The flank angle results in lower radial expansion than with conventional screws. Designed to allow the maximum amount of plastic to be engaged, providing higher sheer loads and resistance to pullout, due to the increased bearing depth of the thread. This, with the ease of penetration through the material, encourages plastic flow, reduces the torque required to drive the screw in and reduces the potential for thread stripping during installation.

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

30° Flank Angle
Diameter /
Length (mm)
2.2 2.5 3 3.5 4 5 6
5 prod-tri-blue-single
6 prod-tri-blue-single prod-tri-blue-single prod-tri-blue-black
8 prod-tri-blue-single prod-tri-blue-single prod-tri-blue-black-red prod-tri-red-single
10 prod-tri-blue-black-red prod-tri-blue-red prod-tri-blue-red
12 prod-tri-blue-red prod-tri-blue-red prod-tri-blue-red prod-tri-blue-single prod-tri-blue-single
14 prod-tri-blue-red prod-tri-blue-red prod-tri-blue-single
16 prod-tri-blue-single prod-tri-red-single prod-tri-blue-red prod-tri-blue-single prod-tri-blue-single
18 prod-tri-blue-single
20 prod-tri-blue-single prod-tri-blue-single
25 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.

D Diameter 2.2 2.5 3 3.5 4 5 6
D1 – max 3.80 4.70 5.50 7.30 8.40 9.30 11.30
K 1.30 1.75 2.05 2.80 3.25 3.40 3.80
Recess 1 1 1 2 2 2 2