Spinning nuts in tight spaces - GIF

[owen moore]

There is a lot of excess thread. Looks like the thread could be shortened by 2 nut thicknesses and still be long enough. It would save time of assembly. That could be important when you are assembling high up on a wind generator tower or the like and time is of the essence. But then again, I could be missing something.

[Frank S]

There is a lot of excess thread. Looks like the thread could be shortened by 2 nut thicknesses and still be long enough. It would save time of assembly. That could be important when you are assembling high up on a wind generator tower or the like and time is of the essence. But then again, I could be missing something.

I believe that once the nuts are run down and torqued they will be adding a second nut as a locking jam nut.
The shoulders of the bolts would most likely extend 2/3rds of the way into the flange and since the length of the threaded portion of a bolt is largely determined by the diameter once they are of a certain size this may be the reason why the seemingly excess thread