The difference in thickness of 50 wt thread is the ply.
Connecting Threads 50 wt cotton is 3 ply compared to Aurifil 50 wt that is 2 ply.
Masterpiece thread is 50 wt sold in 2 ply and 3 ply.
No matter what size thread I use for the top, I use thin thread in the bobbin. Nothing bigger then 60 wt.
Last edited by BellaBoo; 05-18-2013 at 08:09 AM.