Maglite Bulb Retainer Size?

I have a few Mags and some calipers at home (I'll be home in about five hours), but I don't know exactly what "thread size" is. Is it the space between threads, the number of turns per unit of length, or what?

Just let me know what to measure, and I'll measure it. :)
 
I'm guessing it's M13 1.25 or 3/8 24 or something like that. And yes I'm looking to make some custom retaining rings for a project I'm working on. Any help/insight greatly appreciated.
 

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