GemState

The only thread my Bernina balks at is some BLACK threads.

DOTTYMO

I have 440 QE , and can use any thread cheap expensive and sparkle. My friends machine will only use good thread it is a bernina 440. So try all the suggestions and find the best for your machine.

Scissor Queen

That's exactly right. When people say things like "my machine only likes _____ thread" you can just about bet that they only use one size and one type of needle.

Matching the needle to the thread makes a huge difference.

Scissor Queen

When it does that you're using a needle with too small of an eye. Try a topstitch 90/14 next time.

Skittl1321

My Bernina dealer basically told me if I don't use Mettler, Isacord, and Aurafil my machine will blow up (oddly, these are what they sell!!!). I haven't found that to be the case at all. I do use those threads, but I also use Dual Duty and Connecting Threads Essential. Essential is my favorite for piecing, Isacord for quilting and embroidery.

My machine has run great with every thread I've tried.

ube quilting

I use all threads in my 15 yr. old Bernina. I still have thread from my sister thats over twenty years old and as long as it doesn't break when I tug on it, I use it. I do like to piece with aurifil.

peace

Silver Needle

Superior Masterpiece 3 ply for quilting is loved by my Bernina and all our vintage machines. Nice weight for piecing.

Christine-

I have a Bernina 640 and all thread works for me. I use Connecting Threads thread but it is a bit linty.

Silver Needle

I have Bernina 640. My favorite piecing thread is Superior's Masterpiece. It is available on a large cone. I use this thread on all my vintage Singers and they like it also. It has very little lint.

jhoward

I have used a variety of threads on my Berninas.