Don't forget the ply. CT cotton thread is 50wt 3 ply. Aurifil is 50wt 2 ply. Aurifil is thinner. I would use CT Pro (70wt) for my bobbin when using CT 50 wt 3 ply. Top and bottom threads being 50wt 3 ply is a very thick seam.

Agree with Onebyone. You can't go only by the wt to determine size; you must also consider the plys. Aurifil 50wt 2-play is excellent for piecing. I used to piece with Mettler 60wt 3-ply, but Aurifil 50wt 2-ply is actually more fine of a thread.

There is no consistency in the way thread is specified. From what I have heard, Prescencia 60-wt 3-ply is very similar in size to Aurifil 50wt 2-ply, which would make it thinner than Mettler 60wt 3-ply. Go figure.......

Just an idea for remembering the heavier/thinner/higher number/lower:

The way I remember:

It takes 40 pieces side by side of the 40 wt to fill the same area 50 pieces of the 50 wt
The 40 is thicker than the 50

(I sure hope that didn't confuse anyone more, but that's how my brain understands it)

I bought a bunch of spools of their thread and do not like it. I find that it is way too much lint and I also
find it is not consistant. It has lumps which get caught and break the thread when I run the machine fast.

I bought some CT's thread a few years ago to try but I can't even use it in my machine. I have a Brother which I love but the thread spool has to fit inside a thread "canister" and the CT spools are too tall to do so. I do think it is thick just by the feel of it.

So far I have been pleased with my purchase of CT thread but have only used cotton neutrals for piecing... and I agree that it is more linty than others... but great value on the large spools.

Most definitely. I purchased many spools in various colors a long time ago and I'm still using it today for both piecing and quilting. It is a good thread and you will be very happy with it.

I use it all the time for machine quilting. I believe it is 3 ply.
CT have several videos on y-tube by Dr. Dave...... he talks about thread and needle sizes too.

I agree with your assessment....I find it VERY linty. Unbelievably linty between bobbin changes...but I bought several big spools of varigated, so I will have to suck it up until it's gone. Only using it as top thread.

That's pretty close to the actual way it's figured. For needles, wire, thread, anything with a 'higher number is thinner' measurement, it's based on the number of them it takes to fill a tube of a certain diameter. Not confusing at all when you look at it that way. :)