What's the thread?

[DPT]

Looks too fine for 1/2-20 and if those calipers are correct then its more than likely 13x1

[Pop Shot]

Looks too fine for 1/2-20 and if those calipers are correct then its more than likely 13x1

My 14x1 thread protector kinda screwed on the thread but was too loose. Anyone in Palmy have a 13x1 thread cap I can try?

[zimmer]

Top photo counts out to ~14 threads per 15.25mm = ~23 threads per 25.4mm
Set your vernier to 12.7mm and count the threads and x by 2.

[Pop Shot]

Top photo counts out to ~14 threads per 15.25mm = ~23 threads per 25.4mm
Set your vernier to 12.7mm and count the threads and x by 2.

I got 13 threads per 12.7mm. The last few mm is mainly the shoulder.

Not sure what this means?

[DPT]

I got 13 threads per 12.7mm. The last few mm is mainly the shoulder.

Not sure what this means?

1mm pitch is 12.7 threads per 12.7mm length, so I think you are pretty spot on for 13x1

[Maca49]

Looks too fine for 1/2-20 and if those calipers are correct then its more than likely 13x1

You guys never heard of ISO?

[zimmer]

You guys never heard of ISO?

Nah, everyone's still locked in the Imperial world
With a very wee dash of eye-ometer error on behalf of the operator of the verniers I too would say the thread is as already suggested per DPT's post 13x1