Question #6913   Submitted by Answiki on 10/14/2022 at 07:44:29 AM UTC

What diameter should I pre-drill for an M9 tap?

Answer   Submitted by Answiki on 10/14/2022 at 07:45:48 AM UTC

The pre-drilled diameter of an M9 x 1.25 thread is 7.8 mm.


The pre-drilled diameter for tapping is given by the drilling diameter minus the pitch. For a standard M9 x 1.25 tap, you need to drill to 9 - 1.25 = 7.75 ≈ 7.8 mm.

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Answer by Answiki on 10/14/2022 at 07:45:48 AM

The pre-drilled diameter of an M9 x 1.25 thread is 7.8 mm.


The pre-drilled diameter for tapping is given by the drilling diameter minus the pitch. For a standard M9 x 1.25 tap, you need to drill to 9 - 1.25 = 7.75 ≈ 7.8 mm.

Question by Answiki 10/14/2022 at 07:44:29 AM
What diameter should I pre-drill for an M9 tap?
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