The thread former is a tool for the non-cutting production of internal threads. The tap is used in a similar way to a tap drill. The difference is that a tap, as the name suggests, cuts the thread and chips are also produced during the cutting process. In the case of the tap, the thread is created by deformation without cutting.

• No chips
• Longer tool life than a tap
• Higher speed, therefore higher processing speed
• Smooth material surface after processing
• The material fibre flow is not interrupted
• High precision possible.

• Higher demands on the drill hole tolerances
• Higher heat generation than during cutting
• With many materials the use is not possible
• Tap as hand tool badly possible
• Frequently a release agent must be used.

Core hole chart for thread former

 Metric Thread Sizes Metric Thread former Core hole diameter (mm) Metric Thread Pitch coarse thread (mm) M1 0,88 0,25 M1,1 0,98 0,25 M1,2 1,08 0,25 M1,4 1,25 0,30 M1,6 1,45 0,35 M1,8 1,65 0,35 M2 1,80 0,40 M2,2 2,00 0,45 M2,5 2,30 0,45 M3 2,80 0,50 M3,5 3,25 0,60 M4 3,70 0,70 M5 4,65 0,80 M6 5,55 1,00 M7 6,55 1,00 M8 7,40 1,25 M9 8,40 1,25 M10 9,25 1,50 M12 11,20 1,75 M14 13,10 2,00 M16 15,10 2,00 M18 16,90 2,50 M20 18,90 2,50

* All information without guarantee.