Replacing a bobbin takes less than a minute once you know where it sits
The bobbin is a small spool that holds the thread running underneath your fabric. When it runs empty, your stitches stop forming on the underside of your seam. Replacing it means opening the bobbin case (a metal or plastic compartment under the needle plate), sliding out the old bobbin, and sliding in a wound bobbin with fresh thread. The whole job takes about 30 seconds once you locate the bobbin case on your machine.
Singer machines come in dozens of models, but nearly all of them keep the bobbin in the same place: directly under the presser foot, beneath a removable plate. The steps are nearly identical whether you own a basic mechanical Singer from the 1980s or a newer computerized model.
Key Takeaways
- The bobbin case sits under the needle plate, directly below where your needle goes through the fabric.
- You must raise the presser foot before you can remove the needle plate and access the bobbin.
- Most Singer machines use a drop-in bobbin that slides straight into the case with no threading required.
- Wind a fresh bobbin on your machine's bobbin winder before you need to swap it out, so you are never caught mid-project.
- If your bobbin case has a small tension spring, do not force it or bend it when removing the old bobbin.
Locate and open the bobbin case on your Singer
Raise your presser foot by lifting the lever at the back of the presser foot arm. This action also raises the tension discs, which is important because it prevents thread from getting tangled when you remove the needle plate.
Look directly under the needle. You will see a flat metal or plastic plate with a small slot or seam running around its edge. This is the needle plate. On most Singer machines, this plate is held in place by a single screw on the right side. Unscrew it by turning counterclockwise with a small screwdriver (usually a Phillips head, though some older Singers use a slot head). Set the screw somewhere you will not lose it—a small dish or cup works well.
Lift the needle plate straight up and away from the machine. Underneath, you will see a metal or plastic bobbin case shaped like a teardrop or oval. This is where your bobbin lives.
Remove the old bobbin and bobbin case
Look at the bobbin case closely. On most Singer drop-in bobbins, the case itself stays in the machine. The bobbin (the small spool of thread) straightforward sits inside it. Gently pull the bobbin straight out and set it aside. If there is still thread on it, you can unwind it or save it for another project.
Some older Singer models have a removable bobbin case—a metal shuttle that comes out entirely. If your case has a small latch or hook on one side, gently lift it and slide the case out toward you. Be careful not to bend the small tension spring that sits inside the case. This spring is delicate and controls how tight your bobbin thread pulls.
If you are replacing the case itself (because it is damaged or bent), note how the tension spring sits before you remove it. You will need to position it the same way in the new case.
Insert the fresh bobbin
Take a bobbin that you have already wound with thread on your machine's bobbin winder. The bobbin should be full or nearly full—a thin bobbin will run out mid-seam.
For drop-in bobbins (the most common type on Singer machines), hold the bobbin so the thread comes off the top. Slide it straight down into the bobbin case. You will hear or feel a small click as it seats. The thread should rest in the small notch or slot on the edge of the case.
If you have a removable bobbin case, slide it back into the machine the same way it came out, making sure the tension spring is in its original position. The case should slide in smoothly; do not force it.
Thread the bobbin thread through the tension spring
Once the bobbin is in place, you need to guide the thread so it passes through the tension spring. This spring is what controls how tight the bobbin thread pulls, and skipping this step will cause loose or uneven stitches on the underside of your fabric.
Pull the bobbin thread gently upward and to the left (on most Singer machines). You will see a small metal or plastic arm with a slot in it—this is the tension spring. Slide the thread into that slot so it sits between the two metal leaves of the spring. The thread should be snug but not pinched.
Pull the thread a bit more to make sure it is seated properly. You should feel slight resistance as the spring grips the thread.
Replace the needle plate and raise the presser foot
Lower the needle plate back down over the bobbin case, making sure it sits flat and flush with the machine body. The screw hole should line up. Insert your screw and turn it clockwise until it is snug—do not over-tighten, as this can crack the plate.
Lower the presser foot by pushing down on the presser foot lever. This action lowers the tension discs and prepares the machine for sewing.
Pull both the top thread and bobbin thread toward the back of the machine, under the presser foot, for about 4 inches. This prevents the threads from tangling when you start sewing.
Test your bobbin before you start sewing
Before you begin a real project, sew a few stitches on scrap fabric to make sure the bobbin is threaded correctly. Look at the underside of the seam. The stitches should be even and the same color as your top thread (if you used the same thread color). If the underside looks loose or loopy, the bobbin thread is not threaded through the tension spring correctly—stop and rethread it.
If the stitches look even on both sides, you are ready to sew. If they still look wrong after you rethread, the bobbin case itself may be bent or damaged, and you may need to replace it.
Wind a fresh bobbin so you are never caught without one
The best time to wind a new bobbin is before you run out of thread mid-project. Most Singer machines have a bobbin winder mounted on the right side of the machine body. It is a small spindle with a tension disc.
Place an empty bobbin on the winder spindle and slide it all the way to the right until it clicks. Thread your top thread through the tension disc on the winder (usually a small slot or notch). Wrap the thread around the bobbin two or three times by hand to get it started. Press the foot pedal or press the start button (on computerized models) and let the machine wind the bobbin automatically. It will stop on its own when the bobbin is full.
Remove the full bobbin and trim the thread. Now you have a spare ready to drop in whenever you need it.
Frequently Asked Questions
What if my bobbin case is stuck and won't come out?
Stop pulling and check that you have raised the presser foot first—this releases tension on the case. If it is still stuck, the case may be bent or the machine may have lint buildup around it. Use a small brush to clean away any lint, then try again with gentle, steady pressure. If it remains stuck, the case may need replacement.
Can I use a bobbin from a different sewing machine brand?
No. Bobbin sizes and shapes vary by brand and sometimes by model within a brand. Using the wrong bobbin can cause the thread to slip or jam. Check your Singer manual or the bobbin case itself for the correct bobbin type—it is usually printed on the case or in the manual.
Why do my stitches look loose on the underside?
The most common cause is that the bobbin thread is not threaded through the tension spring. Remove the needle plate, check that the thread is seated in the tension spring slot, and try again. If stitches are still loose after that, the tension spring itself may be bent and need replacement.
How often should I replace my bobbin?
Replace it when it runs out of thread, not on a schedule. A full bobbin holds enough thread for several hours of sewing. If you sew regularly, wind a few bobbins at once so you always have a fresh one ready.
Do I need to rethread the top thread after I change the bobbin?
No. The top thread path does not change when you swap bobbins. You only need to pull both threads toward the back of the machine under the presser foot before you start sewing again.