Flowform®

The innovative sheet metal.

The Flowform® screw is the innovative alternative to conventional methods for joining sheet metals together. It makes it possible to join several components without pre-drilling.

The Flowform® screw is a polygonal screw based on TAPTITE 2000®, which makes use of the technology known as "flowhole-forming" in manufacturing processes.

Using this technology the Flowform® screw causes the sheet metal to heat, using a combination of axial force and relatively high screwdriver speed (figure 1). Once the material has been penetrated (figures 2 and 3) the polygonal shape of the screw forms a calibrated metric female thread (figure 4) which can accept a metric screw in the event that a repair is required. After the torque-controlled assembly process (figure 5) the formed through-hole adjusts optimally to the contours of the screw (figure 6).

In a comparison of conventional flow flowhole-forming screws with round cross-sections, the polygonal geometry of the Flowform® screw shows its great advantage. Figure 1 shows the torque produced when a Flowform® screw is processed, compared with that of a conventional flowhole-forming screw with a round cross-section. The polygonal shape means that the Flowform® achieves a much greater DELTA between the tapping torque and the tightening torque than flowhole-forming fasteners with a round cross-section.

This gives the following advantages:

  • Higher process reliability in the screw fastening with the option of a larger screwdriver shut-off window
  • More flexibility when selecting the screwdriver, and more straightforward monitoring of the assembly process.
  • In addition the Flowform® screw considerably reduces screw-in times.

A comparison of current joining.

Flowform® Simulation

How do Flowform® fasteners work?

Using "flow punch-forming" technology the Flowform® screw causes the sheet metal to heat, using a combination of axial force and relatively high screwdriver speed. Once the material has been penetrated the polygonal shape of the screw forms a metric female thread. After the torque-controlled assembly process the formed through-hole adjusts optimally to the contours of the screw.


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