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 Posted: Jul 12, 2021 08:07PM
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this is before I had my stroke but I think I drilled and tapped a 12g 940.  

 Posted: Jul 12, 2021 06:08PM
 Edited:  Jul 13, 2021 03:20AM
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I finally found the answer. My threaded nut of the sensor is 5/8 - 18 UNF.  

What was confusing me was I could not find a nut to fit the sensor nut. The reason was the 1st thread was slightly banged up by the PO.
It just so happened that I had a 5/8 - 18unf die and what was really fortunate was; it was the one with a split in the die. I needed the split kind to fit over the bulb sensor to get to the nut.

This only took a year.

 Posted: Jun 27, 2021 05:43AM
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Did you drill and tap the cast iron head? or  just chase?

 Posted: Jun 26, 2021 09:38AM
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I have both bits...did this once before

 Posted: Jun 24, 2021 08:33AM
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I have 5/8 X 18 which makes it UNF.

 Posted: Jun 24, 2021 08:16AM
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Dan, that's the ticket. I wanted some light reading.

 Posted: Jun 24, 2021 06:09AM
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CA
Quote:
Originally Posted by 6464s
Sorry, should have been more clear. I wanted the sensor thread. Thanks Minibitz. What does UNC stand for? I should say, is this a plumbing number?
All you ever wanted to know about UNC and UNF threads.
https://en.wikipedia.org/wiki/Unified_Thread_Standard

Pipe threads are different. The threaded portion is tapered so that as you tighten the joint, the gap between the pipe threads and the fitting threads continue to close up until there is no space and it won't (shouldn't) leak even gases.
https://en.wikipedia.org/wiki/National_pipe_thread

.

"Hang on a minute lads....I've got a great idea."

 Posted: Jun 24, 2021 04:50AM
 Edited:  Jun 24, 2021 05:38AM
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Sorry, should have been more clear. I wanted the sensor thread. Thanks Minibitz. What does UNC stand for? I should say, is this a plumbing number?

 Posted: Jun 24, 2021 12:16AM
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Thermostat stud holes are 5/16 UNC. Temp sensor hole is 5/8 UNC.

 Posted: Jun 23, 2021 01:59PM
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64
I am assuming you are talking about the hole for the temp sensor. I believe this is a straight thread. I don't recall the thread, I would have to measure it again (I had reworked one some time ago).

 Posted: Jun 23, 2021 08:36AM
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HI All, What is the thread that is under the thermostat housing? 3/8 NPT? thanks Jim