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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 self tapping screws for plastic 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.

If you would like to order these self tapping screws for plastic, please send us your requirements to further your enquiry.

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