Glowplug Tap Size

[icanfixall]

I am trying to "cleanup" my new offshore idi heads and found the glowplug threads are really ruff. I need to force the glowplugs in and thats not the right thing especially on these items. Anybody know the correct thread tap. I know its metric and I have just about every metric and sae tap at work but can't find this one. Thanks guys.

 

[f-two-fiddy]

I've got one out in my garage, if someone doesn't chime by morning, I'll get it for ya.

10X1.0