Threading the bobbin is the first step after winding

The bobbin holds the lower thread on a Brother sewing machine. Before you thread it, the bobbin itself must be wound with thread using the bobbin winder — a small spindle on the top or side of your machine. Once the bobbin is wound, threading it into the bobbin case takes about two minutes and follows the same path on nearly every Brother model.

The bobbin case sits directly under the needle plate. You access it by raising the presser foot, which automatically opens the tension discs on the bobbin case. Threading happens in a single motion: you slip the thread into a slot, wrap it around a tension spring, and snap the bobbin case closed. The thread is then ready to lock with the upper thread when you lower the presser foot.

Key Takeaways

  • Raise the presser foot before threading the bobbin — this opens the tension discs and lets the thread slip in.
  • Insert the bobbin into the case with the thread unwinding toward you, then pull the thread into the slot on the left side of the case.
  • Wrap the thread around the small metal tension spring, then tuck the thread end under the spring clip on the right side.
  • Close the bobbin case and lower the presser foot to complete threading and lock the upper and lower threads together.
  • Leave a 4- to 6-inch tail of thread hanging from the bobbin case to avoid tangles when you start sewing.

Raise the presser foot to open the tension discs

The presser foot is the metal arm that holds fabric flat against the needle plate. On Brother machines, raising the presser foot lever — located at the back right of the machine — automatically opens two small metal discs inside the bobbin case. These discs grip the thread and control how much tension it has. If the discs are closed, the thread cannot slip into position.

Lift the presser foot lever all the way up until you hear or feel it click. The bobbin case will now be accessible. If you try to thread the bobbin with the presser foot down, the thread will not seat properly and your stitches will be loose or uneven on the underside of your fabric.

Insert the bobbin and pull thread into the slot

Open the bobbin case cover — a small hinged or removable door on the front of the machine, usually held by a single latch or screw. The bobbin case itself is a metal or plastic pod that sits inside. Place your wound bobbin into the case with the thread end unwinding toward you (counterclockwise when you look at the bobbin from the front).

Once the bobbin is seated, pull the thread so it lies flat. You will see a small slot or notch on the left side of the bobbin case. Guide the thread into this slot with your finger. The thread should sit snugly in the slot — this is the first point of tension control. Pull the thread taut as you guide it in so it does not slip out.

Wrap the thread around the tension spring

After the thread passes through the left slot, you will see a small metal spring inside the bobbin case. This spring looks like a tiny hook or clip and controls the lower thread tension. Wrap the thread around this spring — it should go under the spring arm and then back out toward you. The thread makes a gentle U-shape around the spring.

This step is crucial because the spring holds the thread at the correct tension. If you skip it or wrap it incorrectly, your lower stitches will be too loose or too tight. Take your time and make sure the thread sits fully under the spring arm before moving to the next step.

Tuck the thread under the spring clip and close the case

On the right side of the bobbin case, you will see a small metal clip or latch. Pull the thread toward the right and tuck the end under this clip. The clip holds the thread in place and prevents it from unwinding as you sew. Leave about 4 to 6 inches of thread hanging out — this tail prevents the thread from tangling when you start stitching.

Close the bobbin case cover and make sure it latches securely. You should hear a click or feel the latch catch. If the cover does not close all the way, the thread may not be seated correctly — open it again and check that the thread is fully under the spring and clip.

Lower the presser foot to lock the threads

With the bobbin case closed, lower the presser foot lever back down. This closes the tension discs again and locks the lower thread in place. At the same time, the upper thread (already threaded through the needle) will interlock with the lower thread. You are now ready to sew.

Before you start on your actual project, hold both thread tails and turn the hand wheel (the large wheel on the right side of the machine) toward you one full rotation. This brings the bobbin thread up through the needle plate. Pull both threads toward the back of the machine and trim them to about 2 inches. This prevents thread jams and gives you a clean start.

Troubleshooting common bobbin threading problems

If your lower stitches look loose or loopy, the thread may not be wrapped around the tension spring correctly. Raise the presser foot, open the bobbin case, and check that the thread makes a complete U-shape under the spring. If the thread is wrapped only halfway around, it will not have enough tension.

If the thread keeps slipping out of the slot on the left side of the case, the bobbin may not be wound tightly enough or the thread may not be pulled taut when you insert it. Rewind the bobbin using the bobbin winder, making sure the thread is even and snug across the bobbin. Then thread it again, pulling the thread firmly as you guide it into the slot.

If the bobbin case cover will not close, the thread may be bunched or twisted inside the case. Open the cover, remove the bobbin, and rethread it from the beginning. Make sure each step — slot, spring, clip — is done in order and the thread lies flat at each point.

Frequently Asked Questions

Do I need to rethread the bobbin every time I change thread color?

Yes. When you change the upper thread color, you should also change the bobbin thread to match or use a neutral color like gray or beige. Wind a new bobbin with the new color, then remove the old bobbin from the case and insert the new one. Rethread it following the same steps.

What if my bobbin is not winding evenly?

Uneven winding usually means the thread is not feeding smoothly onto the bobbin winder. Check that the thread is threaded through the bobbin winder tension guide (a small slot near the winder spindle) before you start winding. If the thread skips this guide, it will wind loosely and unevenly. Rethread the bobbin winder and try again.

Can I use bobbins from other sewing machine brands in my Brother machine?

Brother machines use standard Class A bobbins, which fit many other brands, but not all. Check your Brother manual or the bobbin case itself for the bobbin type. Using the wrong bobbin size can cause the case to not close properly or the thread to slip. Stick with Brother bobbins or Class A bobbins labeled as compatible with your model.

How tight should the bobbin thread tension be?

The bobbin thread tension is set by the tension spring inside the case and should not be adjusted by hand. If your stitches are consistently loose or tight on the underside of your fabric, the problem is usually upper thread tension, not bobbin tension. Check that the upper thread is threaded correctly through all guides and the needle before adjusting the upper tension dial.

Why does my thread keep breaking when I sew?

Thread breaks when tension is too tight or the thread is not threaded correctly. First, raise the presser foot and rethread both the upper thread and bobbin. Make sure the upper thread passes through every guide and sits in the needle clamp. If thread still breaks, check that your needle is inserted correctly (flat side facing the right direction for your machine) and is not bent or dull. Replace the needle if it is damaged.