What's my thread?

Right machinists what's my thread here.
10 threads.
Attachment 191571Attachment 191573
Cheers

I'm picking 1/2" x 28 TPI

I would say it's metric 13 x 1.......there are only 9 threads over 9.23mm not 10. Easily get an error of 0.23mm measuring like that......you should be using a thread pitch gauge.

Yep 13 x 1 I reckon. To big on the OD for 1/2".

13x1

Pm address and I’ll send a thread gauge to save for future reference.

What they said - 13 x 1

Quote:

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Originally Posted by Longranger

I would say it's metric 13 x 1.......there are only 9 threads over 9.23mm not 10. Easily get an error of 0.23mm measuring like that......you should be using a thread pitch gauge.

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Well spotted.
GPM.

I'm in the 13x1 camp as well.
PS for my industry that's odd. any metric thread with and odd number OD is a flag to double check.
Z

Cheers for that guys
Hardy cut the thread for the original rifle which was a model 7.
I guess they cut as big a thread possible in the skinny barrel.
I had thought it was 14x1 but the dimensions didn't stack up even though it looked to be a x1mm thread as it doesn't seem to match up with any imperial threads.
13x1 it must be