65mm spinal thread size

Do had one of kide with changing bits and in the process he damaged the thread on the router.
Whats the sizing on it?

There are replacement nuts/collets at:

Its the thread on the spindle, not the actual nut.

Need to know what type of tap and die i need to get. Is it SAE or Metric size?

Here are two threads which discuss this:

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Usual preface, I’m with PreciseBits so while I try to only post general information take everything I say with the understanding that I have a bias.

The short answer is that it depends. I believe that there have been 2 sizes of the 65mm spindle.

However, for ER spindles the thread sizes are:

ER11 Std: M14 x 0.75
ER11 Mini: M13 x 0.75
ER16 Std: M22 x 1.5
ER16 Mini: M19 x 1.0

Check a good section of the thread with a set of calipers to confirm. That said, we usually don’t recommend taking a die to spindles. You are usually better off using files to re-dress the threads.

Hope that’s useful. Let me know if there’s something I can help with.

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Just to make sure- im talking about this.

Yeah, that’s what I thought you were talking about. That one says it’s ER11. So, it would be either the M14 x 0.75 (standard thread) or M13 x 0.75 (mini thread).

Again though, I wouldn’t recommend taking a die to it but redressing with files.

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