What type of threads do bulgin 22mm switches use?

[Emission]

I did a quick search around the forums and a lot of google searching and I cannot for the life of me find this simple piece of info.

I'm working on a custom case design and I'd like to incorporate bulgin switches. If I can, I'd like to have the mounting holes themselves tapped with the correct threads for a cleaner install.

The closest that I can find is that they might be metric M20x1.5. I don't have any real way to confirm this as I don't have the switches in hand yet, and I need to know the exact thread before I get anything machined.

I can't tell just from the thread diameter spec.

http://www.frozencpu.com/products/1...-_Ring_Illumination.html?tl=g52c341s316#blank

 

[[21CW]killerofall]

18.97mm x 26TPI. Got it from here: http://www.bulgin.co.uk/PDFs/Cat83_Pages/Bulgin_2010_p180.pdf which I got from here: http://www.bulgin.co.uk/Products/Switches/Illuminated.html
Wasn't hard, took me less than 5 minutes and I have never heard of this company nor do I mod cases. Lets just say I am good at finding random things on the internet but it helped that the company lists their products on their page.
Not sure if that was exactly what you were looking for but the entire spec sheet has everything you will need.

 

[Emission]

Thanks! I could not for the life of me find that spec sheet. I found a few others that looked just like it but for some reason did not list any thread specs other than diameter.

I'm usually pretty good about finding exactly what I need but I guess I just didn't have quite the right search terms.