What does thread yard, sizes and weight mean
 

I have been looking for new thread. I keep coming across different sizes and weights. For instance, "cotton machine quilting thread 1200 yd size 50, 30 wt. I also came across some that where 1200 yd size 50 50 wt. What does this all mean? Now is this the right kind of thread to use on a regular sewing machine.

Peckish gave us a resource for superior threads but I don't know how to find it so I'll give you what I copied out.
Thread Weights:
A=20 miles weighs 1 lb.
B=40 miles weighs 1 lb. (labelled 40 wt. and finer)
C=60 miles weighs 1 lb. (labelled 60 wt. and finer yet) hopes this helps

yes, go to Superior Threads web site and they have thread sizes and needle sizes explained. Plus, they have a chart, you can print out with suggested needle sizes to use w/ either your LA or domestic machine with all their threads.

I think the biggest thing is what does your machine handle. Most of the thread I use on my sewing machines are 50wt or 40tx. I have a longarm and use Signature Cotton on my LA, so I also use this on my DSM, putting the 3000 yd spool on a stand that holds a large spool and has an arm that comes up to guide the thread.

Different threads have different purposes. Here is a good link that will give helpful information.

http://quiltbug.com/articles/thread-theory.htm

Here's the link to an article written here on this board.

http://www.quiltingboard.com/resources/article-72.html

Basically, 1200 yds is the length of thread on the spool.
Size/weight 40 is like saying "dress size 10" only reverse; the higher the number the finer the thread (in general).

A 50 wt thread can be used for piecing and quilting. If I want my quilting to stand out more I use a 40 wt thread.

Superior Thread has great info on their site. You can read their newsletter here http://www.superiorthreads.com/newsletters/603/. The very first paragraph talks about thread size.
There is more in-depth information here: http://www.superiorthreads.com/educa...ad-is-measured. If you click the "Education" button, you will find more than you ever wanted to know about thread.

what are you wanting to do with the thread longarm, piece, or free motion with your domestic?