What weight thread do you use?
 

I use 50 weight aurifil for piecing but have looked at the 40 weight. Any opinions from those who use 40 weight and what do you use it for? Want to order some new thread but don't know if want to changs. Thank you.

Right now, I am using a Prescencia 60/3 thread. It has the strength of 3 plys, but is finer than 50 weight. I don't know anyone who uses 40 weight for piecing.

40 wt is heavier thread. In my opinion is too thick/ heavy for piecing.i sometime use 40wt for machine quilting or even hand quilting if it is a color I want to use.i usually piece with 50wt thread.

I also piece with Prescencia 60 wt.

I don't really pay attention to the weight of thread. Most labels have come off the spools. I just pick by the color but, mainly use off white the most.

40 wt thread is usually used for machine quilting when you want the thread to show up. It's too thick for piecing.
The thread weight and ply determines what size needle to use. 50 wt 3 ply is thicker then 50 wt 2 ply. But fine piecing thread is much different then regular run of the mill thread in thickness and smoothness even if the same wt. Thread education is key to successful sewing and machine quilting.