Making a skip bolt some call it a shoulder bolt

[Frank S]

Hi Frank: Thanks for your fast reply and my apologies for my slow response. Its been a rough past few days!

Sorry for the persistent questions. I'm still trying to find the nut with a shoulder and how it locks in place and still give freedom of rotation.

It appears to have more flexibility in design compared to a shoulder bolt. Is the sleeve free to turn or is it locked in place?

the nut has a short shoulder to pilot into the hole then it is welded to the structural member, the shoulder of the bolt pilots into the hole as well this insures any side loading is carried by the shoulder of the bolt.
I could have just slid a sleeve over a bolt just as well but I wanted the assembly to be dead ridged and centered to another truck assembly.
the truck assembly is free to rotate on the shoulder in the space between the head of the bolt and the structural member
Actually rotate is a misnomer it would be more like oscillate since there will be almost zero movement having the bolt as the pivot in the truck assembly just assures that the rollers will be equally loaded with no single point loading of any 1 bearing possible