Cutting External Metric Threads - Instructions


An external thread can be produced quickly in just a few steps with the right tool. You should know that external threads are always cut on a round bolt or rod, the bolt diameter must be slightly smaller than the thread you want to cut. In the table below you can see for which thread you need which bolt diameter.


Außengewinde selbst schneiden, Außgengewinde selbst herstellen, Außgengewinde schneiden, Außengewinde herstellen
Schneideisenhalter und Schneideisen für ein Außengewinde

The following tools are required for external thread cutting:













You will find the suitable bolt diameter for the respective thread in the following chart.



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Cutting External Threads Chart



Bolt Diameter



Thread Pitch (mm)

M1 0,97 0,25
M1,1 1,07 0,25
M1,2 1,17 0,25
M1,4 1,36 0,30
M1,6 1,54 0,35
M1,8 1,74 0,35
M2 1,94 0,40
M2,2 2,13 0,45
M2,5 2,43 0,45
M3 2,92 0,50
M3,5 3,41 0,60
M4 3,91 0,70
M5 4,90 0,80
M6 5,88 1,00
M7 6,88 1,00
M8 7,87 1,25
M9 8,87 1,25
M10 9,85 1,50
M12 11,83 1,75
M14 13,82 2,00
M16 15,82 2,00
M18 17,79 2,50
M20 19,79 2,50
M22 21,79 2,50
M24 23,77 3,00
M27 26,77 3,00
M30 29,73 3,50
M36 35,70 4,00
M42 41,69 4,50
M48 47,66 5,00
M56 55,62 5,50
M64 63,58 6,00

* All information without guarantee.

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Cutting External Threads - step by step instructions


1. Determine the pin diameter with a caliper gauge.

2. A tropical cutting oil on the tap and on the bolt.

3. Then turn the tap one turn clockwise.

    Attention! Always place the die straight and not at an angle!

4. Then turn the tap counterclockwise for half a turn.

    This is very important in order to break off the chip that occurs during cutting.

5. Repeat the cutting process as described in points 3. and 4. until the desired thread length has been reached.


The function of the finished thread can then be checked with a suitable nut.



If you want to know how to cut an internal thread yourself in just a few steps, you will find all the information here.




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