04-08-2013, 06:47 PM
Definitely 12 tpi because it was an imperial shaft to start with.
I did check 2mm pitch but even on the short arm of the thread gauge you could see the run out error.
1/2 x 12 is very common here, it's 1/2" Whitworth but 1/2" x 13 UNC isn't as common here now all the car firms that were associated with American parent companies have long gone.
There used to be a lot of threads of UNF / UNC form but now most of our car firms have ties into Europe and the far east it's all metric.
I did check 2mm pitch but even on the short arm of the thread gauge you could see the run out error.
1/2 x 12 is very common here, it's 1/2" Whitworth but 1/2" x 13 UNC isn't as common here now all the car firms that were associated with American parent companies have long gone.
There used to be a lot of threads of UNF / UNC form but now most of our car firms have ties into Europe and the far east it's all metric.
John S., Nottingham, England.