Class 15 vs Class 15J Bobbin
“Are all size 15 bobbins interchangeable? Metal and plastic? 15J vs. plain 15? My machine manual does not have the bobbin size anywhere. I watched two different instructional videos on that model—one said 15J and the other said 15. I called the company and also got an ambiguous answer. 15J came with the machine. I’ve measured everything I can measure, and I can’t see any difference between them.”
Submitted by Patricia
Class 15 bobbins and size 15J bobbins are not always interchangeable as the 15J is slightly smaller. However, one of my personal machines uses class 15 bobbins and I accidentally purchased 15J bobbins for it. The only place this was an issue on my machine was on the bobbin winder—the class 15 bobbin wound just fine, but the 15J just spun in place. The 15J that I purchased were pre-wound and using the bobbin straight from the package did not affect my sewing; however, I just can’t rewind them.
This being said, if 15J came with your machine, that is the type you should use.
Hope this helps when deciding to use Class 15 vs 15J Bobbins!
-Ashley
Related Video: Bobbin Sizes: Understanding the Sizes of Bobbins
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How to Wind a Bobbin Correctly Every Time
How to Adjust a Rotary Bobbin on Your Sewing Machine
Bobbin Work
Proper Bobbin Use
What Size Bobbins Do I Need?
Bobbin Storage & Transfer
Understanding the Benefits of Bobbin Winders
Quick Tip: Bobbin Troubles
Proper Bobbin Use
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I have 15J bobbins from a Singer machine and tried to use them in my Brother which was supposed to use 15. It did not work well. The 15J is shorter side to side than the 15. I have used generic 15 bobbins from Amazon in my Brother and Babylock and they work fine.
I have a Bernina 770QE and our bobbins are different,they are called a Jumbo Bobbin. I made the mistake of buying cheap bobbins from Amazon,.most don't work and I went to Bernina to purchase the bobbins no more problems.
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