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Bobbins and bobbin cases

Bobbin cases, bobbins, bobbin winders and bobbin cover plates for domestic, serger and industrial machines, plus pre-wound bobbins for embroidery and quilting. A bobbin case is specific to the model, and a bobbin is specific to a class — Class 15, Class 66, L-style, M-style and a few others — so start from your model number. Every bobbin-case page lists the machines it is specified for, and every bobbin page states its class.

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Getting the bobbin right

Bobbin class is decided by the model, not the brand. Singer alone uses Class 15, Class 66 and others across its range, and a Class 66 bobbin dropped into a Class 15 machine will stitch badly or not at all. If you still have an old bobbin, measure it: Class 15 is about 20.3 mm across with flat sides; Class 66 is the same width with slightly domed sides; L-style is a shorter 20.3 mm bobbin used in many sergers and embroidery machines; M-style is the large 24.9 mm industrial and long-arm bobbin. Our bobbin guide has the table.

Bobbin cases are either front-loading (a removable case that drops out of the hook, usually with a latch) or drop-in (the bobbin sits in a fixed case under a clear cover). The two are not interchangeable, and within front-loading cases the hook position and tension-spring design vary by model — buy by model number, not by appearance.

A bobbin case that has been dropped or that has a nicked tension spring is the most common cause of thread looping underneath the fabric. It is a cheap part to replace and worth trying before anything else.

Pre-wound bobbins save winding time for embroidery and quilting and are sold by class and thread weight; check the class on your machine before ordering a box.

Frequently asked questions

What bobbin does my machine take?

It depends on the model. Check the bobbin case, the manual, or the bobbin guide here. Buying by brand name alone is the most common mistake we see.

Can I use a plastic bobbin instead of metal?

Only if the manual allows it. Some drop-in machines are designed for plastic bobbins and a metal one can affect the bobbin sensor; some front-loading machines want metal. Follow the model's specification.

Why is thread bunching under my fabric?

Usually the bobbin case: a damaged tension spring, lint under it, or the wrong bobbin. The thread-bunching page walks through the checks in order.