How to calculate the size of the camlock coupling?

How to calculate the size of the camlock coupling?

This is an imperial size
Commonly used is inches
1 inch equals 25.4 millimeters
1/4″ means that 1/4 inch equals 0.25*25.4 equals 6.35 mm
If it is a thread, how many teeth should be left behind, such as 1/4″-24UNF
It means that the major diameter of the thread is 6.35 and there are 24 threads in 1 inch 25.4 mm.
Of course the pipe thread is not calculated like this

 

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