Dip Tube Variances

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I tried M6 x 1mm and it engages about one turn and stops...seems M6 diameter is correct, but the thread pitch of 1mm is not...

X1.5 then...

Figure out what you have....there's even a free app for it, Thread Pitch. Very accurate. It's been a time saver for me, especially when I ran CNC.
 
I got a chance to look at an old SP valve dip tube this morning. It does have an odd thread. Measuring, it's diameter and checking the threads with a pitch gauge, I come up with 1/4- 48, had to put it under a good bit of magnification to see the threads. A quick check and found "Drills and Cutters" has taps and dies for around $12 USD.
 
Probably M6 x 0,75
 
I got a chance to look at an old SP valve dip tube this morning. It does have an odd thread. Measuring, it's diameter and checking the threads with a pitch gauge, I come up with 1/4- 48, had to put it under a good bit of magnification to see the threads. A quick check and found "Drills and Cutters" has taps and dies for around $12 USD.
Slightly butchery but with the right size tap you might be able to run over the threads from a normal dip tube, to make what you needs or keep threading and cut off the multi thread part, ( it will help you start square,..)
 
I have a hard time believing 48 TPI. That is super fine threads. It is almost as if you were counting tips and roots and not just tips.
 
Not counting anything, I have a small machine shop and do this kind of thing all the time. I used thread pitch gauges under high magnification to check them, no guess work involved. Double checked with a metric gauge, not metric. Obviously I can't say for sure what the OP has but there is no doubt what the threads on the SP valve I have are. They are the correct diameter for 1/4 (measured with a micrometer) and the threads are definitely 48 tpi as measured by a thread pitch gauge, hard to conclude they are anything other then 1/4-48.
 
Not counting anything, I have a small machine shop and do this kind of thing all the time. I used thread pitch gauges under high magnification to check them, no guess work involved. Double checked with a metric gauge, not metric. Obviously I can't say for sure what the OP has but there is no doubt what the threads on the SP valve I have are. They are the correct diameter for 1/4 (measured with a micrometer) and the threads are definitely 48 tpi as measured by a thread pitch gauge, hard to conclude they are anything other then 1/4-48.
Thanks, Herman!
 
Ya gotta love Scubapro!
Right up there with splined hose nuts...
:banghead:
 
https://www.shearwater.com/products/peregrine/

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