What's my thread?

[Remmodel7]

Right machinists what's my thread here.
10 threads.

Cheers

[ishoot10s]

I'm picking 1/2" x 28 TPI

[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.

[Bobba]

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

[Jaco Goosen]

13x1

[Danny]

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

[Ross Nolan]

What they said - 13 x 1

[grandpamac]

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.

Well spotted.
GPM.

[ZQLewis]

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

[Remmodel7]

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