Threading the bobbin is simpler than it looks, and the steps are the same on most Singer models

The bobbin is the small spool that holds thread underneath your fabric. To thread it, you wind thread onto an empty bobbin using your machine's winding mechanism, then place that wound bobbin into the bobbin case below the needle plate. The whole process takes about two minutes once you know where each part is. Most Singer machines use the same basic method, though the exact location of the bobbin winder and case varies slightly between models.

You will need an empty bobbin (these come with your machine or can be bought separately), thread in the color you want, and access to your machine's bobbin winder — a small wheel or spindle on the side or top of your machine. If you cannot find yours, check your machine's manual or look for a metal or plastic spool-shaped part near the thread guides.

Key Takeaways

  • Wind thread onto an empty bobbin using your machine's bobbin winder before you can thread it into the bobbin case.
  • Place the bobbin on the winder spindle, guide thread through the tension disc, and press the bobbin against the winder wheel until it stops automatically.
  • Once wound, remove the bobbin and insert it into the bobbin case with the thread tail pulled through the tension spring.
  • The bobbin case sits directly under the needle plate, and you access it by lifting the presser foot and removing the plate.
  • If your bobbin is wound unevenly or too loose, the thread will break or skip stitches during sewing.

Locate your bobbin winder and prepare the bobbin

On most Singer machines, the bobbin winder is a small spindle or wheel on the right side of the machine, near the top. Some older or compact models have it on the left. Look for a metal post with a small wheel or a plastic spool-shaped piece attached. This is where you will wind the thread.

Take an empty bobbin — a small plastic or metal spool — and slide it onto the winder spindle. It should fit snugly. If it does not, you may have the wrong size bobbin for your machine. Singer makes several bobbin sizes, so check your manual to confirm you have the right one. Once the bobbin is on the spindle, you are ready to guide the thread.

Guide thread through the tension disc and onto the bobbin

Pull thread from your spool (the one on top of your machine) and guide it through the bobbin winder tension disc. This is a small metal or plastic piece near the winder spindle that looks like a slot or a clip. The tension disc controls how tightly the thread winds onto the bobbin. Thread the line through this disc — you will feel slight resistance, which is correct.

Once the thread is through the tension disc, wrap it around the bobbin two or three times by hand to anchor it. This keeps the thread from slipping as the winder starts. You do not need to tie it; the wraps hold it in place. Now you are ready to engage the winder.

Wind the thread onto the bobbin

Press the bobbin gently against the winder wheel (the spinning part). On most Singer machines, the wheel is on the side of the bobbin winder assembly. As soon as the bobbin touches the wheel, the machine will begin winding automatically. The bobbin will spin and pull thread from the spool on top of your machine.

The winding will stop on its own when the bobbin is full — you will hear a click or feel the machine pause. Do not force it to keep spinning after it stops; the bobbin is done. If the thread is wound unevenly (bunched on one side or loose in spots), remove the bobbin and try again with a fresh one. Uneven winding causes thread breaks and skipped stitches during sewing.

Remove the bobbin and trim the thread

Once the bobbin stops winding, lift it off the spindle. Cut the thread between the bobbin and the spool on top of your machine using scissors or the thread cutter built into many Singer machines (usually a small notch near the bobbin winder). Leave a tail of thread about 4 to 6 inches long hanging from the bobbin — you will need this to thread the bobbin case.

Inspect the bobbin before you insert it. The thread should be wound smoothly and evenly around the entire spool, not bunched or loose. If it looks wrong, unwind it and start over with a fresh bobbin.

Insert the bobbin into the bobbin case

Lift the presser foot (the metal arm that holds fabric down) all the way up. This is important — the bobbin case will not open unless the presser foot is raised. Now locate the bobbin case cover, a small metal or plastic plate directly under the needle. On most Singer machines, you remove this by turning a small screw counterclockwise or by sliding a latch to the side. Check your manual for the exact method on your model.

Once the cover is off, you will see the bobbin case — a small metal or plastic pod with a slot or spring inside. Insert the wound bobbin into the case with the thread tail pointing toward the tension spring (a small metal clip inside the case). Pull the thread tail through the tension spring slot. You should feel the thread catch slightly as it passes through. This tension spring controls how the bobbin thread feeds during sewing.

Replace the bobbin case cover and tighten the screw or latch. Make sure it is find but do not overtighten, or you may crack the case. Lower the presser foot. Your bobbin is now threaded and ready to sew.

Troubleshoot if the bobbin does not wind evenly

If the thread bunches on one side of the bobbin or winds too loosely, the tension disc may be dirty or the bobbin may be damaged. Remove the bobbin and inspect the tension disc for lint or thread bits. Wipe it clean with a dry cloth. If the bobbin itself has cracks or dents, replace it with a new one.

If the thread keeps slipping off as you wind, you may not have wrapped it around the bobbin enough times at the start. Try wrapping it four or five times instead of two or three, and press it more firmly against the winder wheel. If the problem continues, the winder wheel itself may be worn and need replacement — this is a job for a repair technician.

Frequently Asked Questions

Can I use any bobbin in my Singer machine?

No. Singer makes several bobbin sizes and styles. Using the wrong size will cause the bobbin case to jam or the thread to wind unevenly. Check your machine's manual or the bobbin case itself — most have the correct bobbin size printed on them. Bobbins are inexpensive and widely sold, so buying the right ones is worth it.

What if the bobbin thread keeps breaking while I sew?

A breaking bobbin thread usually means the bobbin was wound too loosely or unevenly, or the thread is not seated properly in the tension spring. Rewind the bobbin and make sure it stops when the machine stops automatically — do not keep winding by hand. When you insert it into the case, pull the thread tail firmly through the tension spring slot so it catches.

Do I have to wind a new bobbin every time I change thread color?

Yes, if you want a different color on the underside of your fabric. The bobbin thread shows on the back of your seams, so most sewers wind a new bobbin when they change top thread colors. You can keep wound bobbins in a container and reuse them later, so you do not have to wind one every single time you sew.

Why does my bobbin winder keep stopping before the bobbin is full?

The automatic stop mechanism may be triggered too early if the bobbin is not pressed firmly enough against the winder wheel, or if the bobbin is damaged. Press the bobbin more firmly against the wheel and try again. If it still stops early, the bobbin may have a crack or dent — replace it with a new one.