Minimag tailcap threads

[mr.squatch]

I guess on the bigger mags the threads are all cut on a lathe, but it looks to me like the minimag 2xaa tailcap threads are just a straight 5/8x24 (if I remember correctly). Is this the case? I have one I want to cut down but I don't dare unless I know the threads will work. I found a cheap tap for under 10 bucks, doesn't have to cut much. Post up if you know the answer, I'll have something to work on during my Sunday afternoon Thanks


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[Torque1st]

I believe they may be 5/8" but not 24 TPI. They are somewhere between 24 and 27 TPI.

 

[will]

The mini-mag is 28 threads per inch. Also, there is a clear start at the beginning for the seal on the tailcap. I have done a number of these on my lathe with a single point threading tool.

 

[Torque1st]

I checked two different samples with a thread pitch gage I have and a lighted inspection magnifier. Unfortunately my gage does not have all the different pitches. My gage was made for identifying Aeroquip hydraulic fittings. A thread gage is flat metal so the actual thread form can be seen. It is difficult to tell what the pitch is when comparing two round threaded objects.

With just a short section of threads 28TPI could be made to work if the threads were loose enough.

 

[mr.squatch]

Yep, I found my note, it's 28tpi. Thanks for the advice, Looks like I'll be doin some cuttin this afternoon

g

 

[Torque1st]

I have a good Starrett thread pitch gage now and it is 28TPI. Sorry for any confusion.