Looking to source alignment studs for circuit board
This can usually be found as part of modular backplane connectors.

For example, here are some parts from the TE connectivity (tyco) catalog:


5223985-x: guide pin (diam. 4.85mm)
5223986-x: receptacle


Molex also has similar things:


76153-1001: guide pin (diam. 5.5mm)
75234-1478: receptacle


And probably many others manufacturers have some. To find them, go in mouser/digikey search engines, and try search words like backplane and guide.