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TX Flange Head Thread Forming Screw for Plastic

SKU: TFS11 Category:

FasPlas TX Flange thread forming screws, also known as 6 Lobe or Star Drive, are designed to be installed into pre-drilled or moulded holes in plastic and other soft materials.

  • TX / 6 Lobe Drive – high torque and cam-out resistance than regular Phillips / Pozi drives
  • 30° thread angle – 45° and 60° to order only
  • Range of diameters and thread lengths
  • Manufactured in steel zinc or zinc & black, with stainless steel also available.

When fixing screws to metal, wood and other hard materials it is relatively easy to form a tight, secure fit. When working with a less sturdy material such as plastic, it can be more difficult. At a certain torque, the screw can start to strip the plastic so it is important to use the right type of screw, such as the FasPlas TX Flange thread forming screw.

FasPlas TX Flange threadforming screws use a 30° thread angle to form a mating thread into the plastic as they are driven rather than actually removing the material which ensures a strong pull-out resistance and leaving no mess after installation.

The FasPlas TX Flange Screw is designed with grooves in a six point pattern making it a superior choice over the Pozi or Phillips version as it is much more user friendly, offering a reduced incidence of slippage and cam-out. This in turn reduces the risk of damage to the tool, screw and application. In addition, the flange head acts as an built in washer that allows the torque and clamping force to be spread over a wider surface area, as well as sitting flat on the surface of the material.

FasPlas TX 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 TX 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
Diameter /
Length (mm)
2.2 2.5 3 3.5 4 5 6
= Steel (Zinc or Black Zinc)
= 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 Flange Threadforming screw technical drawing

D Diameter 2.2 2.5 3 3.5 4 5 6
D1 – max 4.50 5.00 6.00 7.00 8.00 10.00 12.00
K 1.40 1.50 2.10 2.40 2.60 3.30 3.60
Recess T6 T6 T10 T10 T20 T20 T25

*For guidance purposes only