The basic steps for loading a bobbin

A bobbin is the small spool that holds thread underneath your fabric. To load one, you wind thread onto an empty bobbin using your machine's winding mechanism, then place the wound bobbin into the bobbin case (or directly into the bobbin area, depending on your machine type). The process takes about two minutes once you know where each part is.

The exact steps depend on whether your machine has a top-loading bobbin (you insert it from above, near the needle) or a front-loading bobbin (you open a small door on the front of the machine). Both methods are straightforward, but the location of parts differs. Your machine's manual will show you which type you have—if you don't have the manual, search your machine's brand and model number online and read the PDF.

Key Takeaways

  • Wind thread onto an empty bobbin using your machine's bobbin winder before you try to load it into the machine.
  • Top-loading bobbins sit in a case near the needle; front-loading bobbins slide into a compartment you access from the machine's front door.
  • The bobbin thread must be threaded through a small tension spring or slot in the bobbin case so it feeds correctly under the fabric.
  • If your machine skips stitches or the bobbin thread looks loose, the bobbin is usually not seated fully or the thread is not threaded through the tension spring.

Winding the bobbin before loading

You cannot load an empty bobbin—you must wind thread onto it first. Place an empty bobbin onto the bobbin winder spindle (a small rod on the side or top of your machine, depending on the model). Guide the thread from your spool through the bobbin winder tension guide (a small notch or hook), then wrap it around the bobbin a few times by hand to hold it in place.

Press the foot pedal or press the start button (machines vary) and the bobbin will spin and wind thread onto itself. Stop when the bobbin is full—most machines have a sensor that stops automatically, but some do not. A full bobbin looks evenly wound and slightly rounded on the sides. Remove the bobbin from the winder and trim the thread tail.

If your bobbin winds unevenly or the thread is loose, the thread may not be seated in the tension guide. Rethread it and try again. A bobbin that is wound too loosely will cause the bottom thread to skip or break while you sew.

Loading a top-loading bobbin

Top-loading bobbins sit in a removable case directly under the needle. Raise your presser foot (the metal piece that holds fabric down) and raise the needle to its highest point by turning the handwheel toward you. This opens the bobbin case slightly and makes it easier to remove and insert.

Look for a small latch or clip on the bobbin case—usually on the left side. Slide or unclip it and lift the entire bobbin case out. Place your wound bobbin into the case with the thread tail pointing toward the small tension spring (a thin metal piece inside the case). Pull the thread tail through the tension spring slot until you hear or feel a small click. The thread should sit snugly in the spring.

Reinsert the bobbin case into the machine, aligning the notch on the case with the notch on the machine body. Push down until it clicks into place. Pull the bobbin thread up through the needle plate (the flat metal plate under the needle) by turning the handwheel one full rotation toward you. You should see a loop of bobbin thread come up through the plate. Grab this loop with your fingers and pull it to the side—this is normal and means the bobbin is loaded correctly.

Loading a front-loading bobbin

Front-loading bobbins sit in a compartment you access from the front of the machine. Open the small door or cover on the front—it usually swings down or slides to the side. You will see a round or oval opening where the bobbin sits.

Insert your wound bobbin into the opening with the thread tail pointing upward and to the left (the exact direction varies by brand, so check your manual). The bobbin should sit flat and spin freely. Look for a small tension spring or thread guide near the opening. Pull the thread tail through this guide until it sits snugly. Some machines have a small slot; others have a spring clip you pull the thread through.

Close the front door. Pull the bobbin thread up through the needle plate by turning the handwheel one full rotation toward you. A loop of bobbin thread should come up through the plate. Grab this loop and pull it to the side. Close the presser foot and you are ready to sew.

What to do if the bobbin does not load correctly

If your machine skips stitches, breaks thread, or the bottom thread looks loose, the bobbin is usually not seated fully or the thread is not threaded through the tension spring. Remove the bobbin case (or open the front door), check that the bobbin sits flat and spins freely, and rethread the tail through the tension spring or slot. Make sure you hear or feel the thread click into place.

If the bobbin was wound unevenly or too loosely, wind a new one. A bobbin that is wound too tightly can also cause problems—if the thread is so tight it does not unwind smoothly, discard it and wind another at a normal speed.

If you have reloaded the bobbin twice and the machine still skips stitches, the problem may be a bent needle, a clogged needle plate, or a worn bobbin case. Replace the needle first (this solves most skipping problems). If that does not work, clean out any lint or thread scraps from the bobbin area with a small brush, then try again. If the machine still skips, the bobbin case may need professional cleaning or replacement.

Bobbin types and compatibility

Bobbins are not universal—different machines use different sizes and styles. The most common types are Class 15 (metal, used on many older and mid-range machines), Class A (plastic, common on newer machines), and Class M (metal, used on some computerized machines). Using the wrong bobbin type can cause the thread to wind unevenly or not feed correctly.

Check your machine's manual to find out which bobbin type you need. If you have lost the manual, search your machine's brand and model number and read the PDF, or contact the manufacturer's customer service line. Bobbins are inexpensive (usually a few dollars each) and widely available at fabric stores and online.

Some machines come with plastic bobbins that are pre-wound by the manufacturer. These work the same way as empty bobbins you wind yourself—load them into the bobbin case or compartment and thread the tail through the tension spring. Once they are empty, you can wind them again or replace them with new ones.

Frequently Asked Questions

Why does my bobbin thread keep breaking?

Bobbin thread usually breaks because the bobbin was wound too tightly, the thread is not threaded through the tension spring, or the bobbin case is damaged. Try winding a new bobbin at normal speed, reload it, and make sure the thread clicks into the tension spring. If the thread still breaks, the bobbin case may have a burr or rough spot—contact the manufacturer or a repair shop.

Can I use a bobbin from a different brand of machine?

Only if it is the same class and size. Class 15 bobbins from one brand usually work in other machines that use Class 15, but plastic bobbins are often brand-specific. Check your manual or contact the manufacturer before buying bobbins from another brand. Using an incompatible bobbin can cause thread feeding problems.

How full should I wind a bobbin?

Wind it until it is full but not overstuffed—the thread should form a smooth, rounded shape on the sides. If you wind it too full, the thread may not feed smoothly and can cause skipped stitches. If you wind it too loose, you will run out of thread quickly. Most machines have a sensor that stops automatically when the bobbin is full enough.

Do I need to rewind my bobbin every time I sew?

No. You only need to wind a new bobbin when the current one runs out of thread. You can tell the bobbin is empty when the thread stops feeding or you see very little thread left on the bobbin. One wound bobbin usually holds enough thread for several small projects.

What if I cannot find the bobbin case?

Some newer machines have bobbins that load directly into the machine without a removable case. Check your manual to see if your machine is a front-loading or top-loading type. If you have lost the manual, search your machine's brand and model number online. If the bobbin case is missing or damaged, contact the manufacturer or a repair shop—you will need a replacement to use the machine.