Question: What is the difference between Class 15 and Class 66 bobbins?

Are class 15 bobbins interchangeable?

Definitely NOT interchangeable! They look almost identical, but class 15 bobbins have flat ends, while class 15J bobbins have slightly curved ends. Sometimes they appear to work interchangeably, but even if they fit into your sewing machine, there is a risk of them jamming your machine up and causing major damage.

What is a Class 15 sewing machine?

The Singer Class 15 Sewing Machines feature a low shank and oscillating hooks. They use Class 15 bobbins and 15×1 needles.

What happens if you use the wrong size bobbin?

The short answer is YES! Filling a sewing machine bobbin too tightly can make a plastic bobbin bulge or stretch the thread if you are using a metal bobbin. This may be hard to see but can cause all kinds of problems. Plastic bobbins can become compressed in the center causing the bobbin to distort.

How do you tell a singer 66 from a 99?

The 99 has a single center-mounted slide plate, as seen below: The only way to tell if a machine is full-size or 3/4-size is to look at pictures of them over and over again. After a while you start to get a sense of “Well, that looks too ‘stubby’ to be a 66” and you’ll realize it’s a 99.

Do bobbins come in different sizes?

Bobbins not only come in different sizes, but also in metal as well as plastic, and empty as well as pre-wound. While machines can only use one bobbin size, whether it is plastic or metal does not typically matter, however consult your machine manual to be sure.

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