Glow Plug Thread Size?

Intlwaters

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Standard plug is as already said a UNEF thread of 1/4 diameter X 32 threads per inch pitch. The bit used for drilling the hole for tapping 1/4-32 is a 7/32"

The Turbo plugs are ISO MF thread of 8mm diameter X .75 mm pitch

This is a excellent link to have with very good information on different threads. Good to keep in favorites for sure.

Has all the drill sizes needed when tapping threads.

http://mdmetric.com/thddata.htm#idx
 
Last edited by a moderator:
Chris

I have several 1/4-32 taps. I'll try to bring one to the club banquet.

Lohring
 

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