hotponyshoes
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Most likely to be UNC if it is Chinese (USA is a big market).
Main difference between UNC and Whit is the included angle of the thread, UNC is 60 degree (like metric) and Whit is 55 degree.
Mostly 1/2" being one of the differences, Whit 12TPI, UNC 13.... UNC and Whitworth have the same pitch .....
20tpi, which Whit or UNC would be, is 1.27mm pitch and thus a 1.25mm pitch thread gauge will almost fit.View attachment 219426
Looks pretty close to a 1.25mm metric gauge?
Easier to see on the photo than with my actual eyes
I thought 1/4" was the odd one out in that it is the same pitch, most of the rest are different.Mostly 1/2" being one of the differences, Whit 12TPI, UNC 13.
Nope, 1/2" is the one that is different pitch between UNC and Whit. There is another, at least, but it is up int the big sizes and afraid I can't recall which.I thought 1/4" was the odd one out in that it is the same pitch, most of the rest are different....
I do apologise @Hood you are correct, now trying to remember what I was dealing with, the comparison between BSF and UNF possibly but that one does not have an exact pitch match anywhere that I can see at a glance.Nope, 1/2" is the one that is different pitch between UNC and Whit. There is another, at least, but it is up int the big sizes and afraid I can't recall which.