The basic steps for loading a bobbin
To insert a bobbin, first raise the presser foot (the metal arm that holds fabric down). This action opens the tension discs, which would otherwise pinch the bobbin thread. Locate your bobbin case — on most machines it sits directly under the needle plate, though some models have a side-loading design. Open or remove the bobbin case according to your machine's design.
Place the wound bobbin into the case with the thread end facing the correct direction. Most machines require the thread to unwind counterclockwise, but check your manual because this varies. Insert the thread through the tension spring (a small metal slot or hook) and into the bobbin case slot. Close or replace the bobbin case, then lower the presser foot to re-engage the tension discs.
Pull the bobbin thread up through the needle plate by turning the handwheel toward you while holding the top thread. You should see a loop of bobbin thread emerge. Catch this loop with your top thread and pull both threads toward the back of the machine, leaving a 4-inch tail. You are now ready to sew.
Key Takeaways
- Always raise the presser foot before inserting a bobbin, because this opens the tension discs that would otherwise trap the thread.
- Thread the bobbin through the tension spring in your bobbin case — skipping this step causes loose stitches and thread breakage.
- Pull the bobbin thread up through the needle plate by turning the handwheel, then catch the loop with your top thread.
- Check your machine's manual for the correct thread direction, because some machines wind counterclockwise and others wind clockwise.
Finding your bobbin case
Most home sewing machines use a drop-in bobbin case located directly under the needle. To access it, remove the needle plate (the flat metal piece under the presser foot) by unscrewing the single screw that holds it. The bobbin case sits in a small compartment beneath. Some machines, particularly older models and industrial machines, have a side-loading bobbin case on the left side of the machine — the bobbin slides in horizontally rather than dropping in from above.
Consult your machine's manual to identify which type you have. If you no longer have the manual, search your machine's brand and model number online — most manufacturers post PDF versions free. Knowing your bobbin case type prevents you from forcing parts that should slide smoothly.
Winding and preparing the bobbin
Before you insert a bobbin, it must be wound with thread. Place an empty bobbin on the bobbin winder (a small spindle on the side or top of your machine). Guide your top thread through the bobbin winder tension and onto the bobbin, then press the bobbin against the winder shaft to set up it. The machine will wind the bobbin automatically when you press the foot pedal or start button.
Wind until the bobbin is full but not overstuffed — thread should reach near the edge without bulging. Most machines have a sensor that stops the winding automatically. If your machine does not, watch closely and stop when the bobbin is nearly full. A bobbin that is too full causes tension problems and thread jams.
Threading the tension spring correctly
The tension spring in your bobbin case is the most common place where threading goes wrong. This small metal hook or slot holds the bobbin thread under tension so your stitches lock properly. Insert the thread by sliding it into the spring from the side — do not try to push it straight in. The thread should sit snugly in the spring with slight resistance when you pull it.
If your stitches are loose on the bottom side of your fabric, the bobbin thread is usually not threaded through the tension spring. If your stitches are tight or the thread breaks, the bobbin thread may be pinched or threaded incorrectly. Rethread the bobbin case and test on scrap fabric before returning to your project.
Bringing the bobbin thread to the surface
After closing the bobbin case, you must pull the bobbin thread up through the needle plate so both threads are ready to sew. Hold the top thread (the one coming from your needle) loosely in your left hand. Turn the handwheel (the large wheel on the right side of the machine) toward you one full rotation. As the needle goes down and comes back up, it will catch the bobbin thread and create a loop.
Pull this loop upward with your fingers or tweezers. You will now have both the top thread and the bobbin thread above the needle plate. Pull both threads toward the back of the machine and under the presser foot, leaving 4 to 6 inches of thread trailing behind. This prevents thread from tangling when you start sewing.
Troubleshooting common bobbin problems
If your machine skips stitches or breaks thread frequently, the bobbin is usually the culprit. First, remove the bobbin and inspect it for damage — dents or cracks in the bobbin itself prevent it from sitting correctly in the case. Replace damaged bobbins. Next, rewind a fresh bobbin and rethread it through the tension spring, because old thread can fray and jam.
If you see loops of thread on the bottom of your fabric, the bobbin thread is not threaded through the tension spring. If you see loops on the top, the top thread is not threaded correctly — but this is a top-thread problem, not a bobbin problem. If the bobbin thread breaks during sewing, check for lint buildup in the bobbin case. Use a small brush or compressed air to clean the case, then reinsert the bobbin.
If the bobbin will not wind, make sure you have moved the bobbin winder lever or button to the "on" position — most machines require this step to disengage the needle and engage the winder. If the bobbin still will not wind, the winder may be broken and your machine may need service.
Choosing the right bobbin for your machine
Not all bobbins fit all machines. Bobbins come in different sizes and styles — some are plastic, some are metal, and some machines require specific brands. Using the wrong bobbin causes poor tension, thread jams, and damage to your bobbin case. Check your manual for the correct bobbin type, or bring your machine to a dealer and ask them to show you the right one.
Many machines come with extra bobbins in the original box. Keep these as reference. If you have lost them, buying bobbins from the machine's manufacturer costs more than generic bobbins, but they fit correctly. Generic bobbins sometimes work, but they may be slightly different in size or shape, causing tension problems. When in doubt, buy the brand your machine uses.
Frequently Asked Questions
What happens if I insert the bobbin upside down?
The thread will not unwind correctly, and you will either get no stitches or very loose stitches on the bottom of your fabric. The machine will not break, but you will need to remove the bobbin case and flip the bobbin to the correct orientation. Check your manual for which direction the thread should face.
Can I use a bobbin from a different sewing machine?
Only if the machines use the same bobbin type. Bobbins vary in size and shape between brands and even between models from the same brand. Using the wrong bobbin causes tension problems and can damage your bobbin case. Stick with bobbins made for your specific machine.
How often should I replace my bobbin?
Bobbins last for years if they are not damaged. You only need to replace a bobbin if it cracks, dents, or no longer sits securely in the case. Rewind the same bobbin many times — the bobbin itself does not wear out, only the thread on it.
Why is my bobbin thread breaking?
Bobbin thread breaks when it is pinched, frayed, or wound too tightly. First, rewind a fresh bobbin with even tension — do not pull the thread as it winds. Second, rethread the bobbin case and make sure the thread sits in the tension spring. Third, clean lint from the bobbin case with a brush. If breaking continues, the bobbin case may be damaged and need replacement.
Do I need to raise the presser foot every time I change the bobbin?
Yes. Raising the presser foot opens the tension discs so you can remove and insert the bobbin without the thread getting stuck. If you try to remove a bobbin with the presser foot down, the thread will pinch and you may damage the tension discs.