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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 dropped bobbin case or a damaged tension spring can cause thread looping underneath the fabric. First check upper threading and tension; replace a bobbin case only if it is damaged or incorrect for the machine.

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. Do not choose a bobbin by brand name alone.

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.