I was not able to find useful information about the 1/4 thread's dimensions on the mechanical drawing either. A review article of the camera said though that it was a standard 1/4 thread, so maybe you could get dimensions by googling for details of that thread type.
The article's photo galleries have images of the camera attached to the tripod.
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MartyG is right, the information you are looking for can be found on the link that Marty shared. Inside of the Intel® RealSense™ Camera D415 file.
MartyG, you are THE MAN. Thanks again xD
You're welcome, I'm glad I could be of help. Good luck!