Joint size

.840" is probably the most common size. I've seen them vary by as much as .040" either way, but most are probably between .83 and .86 with the vast majority between .84 and .85.
 
The Schuler joint is outside the normal range at 22mm diameter, which is about 0866”. It is or was a common carom cue joint diameter, and it makes a bit more sense in the metric world.
 
I've personally measured cues from .780 (very old cues) to .870.
I also agree with Sheldon that I believe the majority of the more modern cue builds fall in the .840 to .850 range.
However, like a lot of cue construction, there are no standards.
 
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