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Pozi Flange Head Thread Forming Screw for Plastic

SKU: TFS07 Category:

FasPlas Pozi Flange thread forming screws are ideal for plastic applications providing maximum engagement with the material as the relationship between the drive and the contact material will be a much better fit and less prone to loosening or loss of resistance. The screws feature a domed head that fits tight to the surface and require a pre-drilled or moulded hole to install into.

  • Pozi Drive
  • One piece flange head provides a larger bearing area without requiring a separate washer
  • Choice of 30°, 45° and 60° thread angle
  • Range of diameters and thread lengths
  • Manufactured in steel zinc or zinc & black, with stainless steel also available.

These screws are available in 30°, 45° and 60° thread angles. The angle required depends on the material they are to be fastened into and the level of resistance that is required – having an angled screw will improve the fit and security of the screw and make for a better fit when forming the thread.

The 45° and 60° Pozi Flange thread forming screws feature a trilobular body that means plastic material can fill the extra space that would not be present on a standard circular thread, reducing stress.

FasPlas Pozi Flange threadforming screws come in a variety of sizes in a range of diameters and lengths. As well as being available in various sizes they are also manufactured in different finishes – zinc steel, black steel and stainless steel.

All stocked sizes are listed below. FasPlas Pozi Flange thread forming 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 1.8 2.2 2.5 3 3.5 4 5 6
5 marker-image marker-image prod-tri-spacer prod-tri-spacer prod-tri-spacer
6 marker-image marker-image marker-image marker-imagemarker-image
8 marker-image marker-image marker-imagemarker-image marker-image marker-image marker-imagemarker-image marker-imagemarker-image
10 marker-image marker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image
12 marker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image marker-image marker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image
14 marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image marker-image
16 marker-image marker-imagemarker-image marker-imagemarker-image marker-image marker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image
18 marker-image marker-image marker-image
20 marker-image marker-image marker-image marker-image marker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image
25 marker-image marker-image marker-image marker-image marker-imagemarker-image marker-imagemarker-image marker-imagemarker-image
30 marker-image marker-image marker-image
marker-image = Steel (Zinc or Black Zinc)
marker-image = Stainless Steel
60° Flank Angle
Diameter /
Length (inch)
2.28 4.20 6.19 8.16 10.14
1/4″ marker-image marker-image marker-image
5/16″ marker-image marker-image marker-image marker-image
3/8″ marker-image marker-image marker-image marker-image marker-image
7/16″
1/2″ marker-image marker-image marker-image marker-image marker-image
9/16″
5/8″ marker-image marker-image marker-image marker-image
3/4″ marker-image marker-image marker-image marker-image
1″ marker-image marker-image marker-image marker-image
marker-image = Steel (Zinc or Black Zinc)

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

Why use a Pozi Flange Thread Forming Screw for Plastic?

  • Thread forming angled screw designed for maximum engagement with the plastic
  • Perfect for fixing objects to plastic with a flat contact against the surface material.
  • Provides a secure fastening with the contact material

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

Pozi Flange Threadforming screw technical drawing

30° Flank Angle 45° Flank Angle
D Diameter 2.2 2.5 3 3.5 4 5 6 1.8 2.2 2.5 3 3.5 4 5 6
C – max 1.85 2.25 2.55 3.05 3.55 4.06 5.06 6.06
D1 – max 4.40 5.00 6.00 7.00 8.00 10.00 12.00 6.60 8.00 9.60 12.00
K 1.60 1.80 2.10 2.40 2.50 3.20 4.00 1.60 2.00 2.30 2.90
Recess 1 1 1 2 2 2 3 0 1 1 1 1 2 2 2

Pozi Flange Threadforming screw 60 degree technical drawing

60° Flank Angle
D (Gauge) 2.28 4.20 6.19 8.16 10.14
D (Inch) – max 0.089 0.123 0.143 0.179 0.208
C (Inch) – max 0.092 0.127 0.147 0.185 0.212
D1 (Inch) – max 0.194 0.257 0.321 0.384 0.448
K (Inch) – max 0.059 0.063 0.074 0.093 0.114
Recess 1 1 2 2 2

*For guidance purposes only