About tap class of DIN standard cutting taps

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Cutting Taps Metric Threads Standard (Screw Threads, Center Holes)Specification of toolsBasic Knowledge

I was looking at the electronic catalog page to purchase a standard cutting tap, and the tap class was listed as “ISO2X”.
What does this “X” mean?

Cutting taps with an “X” in the tap class means that they are oversized compared to the standard class (ISO2/ISO3).
The amount of oversize depends on the pitch.

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