What is the Remedy When the Upper Thread Breaks? (10 steps)

What is the remedy when the upper thread breaks? Usually, no matter the consumer level, the upper line is always broken.

Especially many friends like to play the upper thread during the warm-up; when the upper line is broken, it seems that the embarrassment is unbearable.

woman using sewing machine

How do we solve it? The following will tell you the solution to this problem.

But before moving to remedies, we should see the cause of this problem.

Cause of the Broken Upper Thread:

The main reason for the broken upper thread is that the user does not know how to use the machine properly.

There are two ways to operate the machine when using a sewing machine. One way is to sew with the needle and bobbin in the same direction to make a single stitch. Another way is to sew with one side of the fabric facing up, then turn over the other side of the fabric and continue to sew until the whole material is sewn together.

When sewing with the needle and bobbing in the same direction, the upper thread must be pulled out from the lower line by hand. If the upper thread is too long, it will break easily.

If the upper thread is too short, the upper thread will be entangled with the lower line, which makes the sewing process very difficult.


First of all, there are two kinds of upper threads: one is a single-piece upper thread, and the other is a double-piece upper thread.

When the upper thread is broken in the production process, it can be repaired by reattaching the upper line or replacing the whole upper cable.

To repair the upper thread, remove the broken part from the machine, cut off the end of the upper line, and attach the new upper cable.

If the upper thread is broken due to excessive force, it should be replaced with a new one.

If the upper thread is broken because of poor quality control, it needs to be replaced with a new upper line.

If the upper threads have been used for a long time, they may need to be replaced with new ones.

However, if the upper thread has not been used for an extended period, it does not need to be replaced.

There are also some exceptional cases where the upper thread cannot be repaired, such as the upper thread of the sewing machine is broken, the upper line is damaged, etc., so the entire sewing machine must be replaced.

It is recommended that you replace the upper thread every three months, especially after using the machine for more than five years.

2. How to select an appropriate replacement upper thread?

There are various types of the upper thread, including polyester, cotton, nylon, silk, etc.

According to different requirements, you can choose the suitable type of upper thread according to your preferences.

A polyester thread is mainly used in the clothing industry, which is easy to handle, low cost, high strength, good elasticity, and has anti-static properties.

Cotton thread is mainly used in home decoration, furniture manufacturing, shoe manufacturing, etc. It is soft and comfortable, but its price is higher than polyester thread.

Nylon thread is mainly used in industrial fabrics, leather goods, shoes, bags, etc. Its advantages include high strength, high elasticity, and good wear resistance.

close view of upper thread

Silk thread is mainly used in fashion garments, handbags, and accessories. Silk thread is costly but soft, smooth, beautiful and elegant.

3. How to install the upper thread?

Before installing the upper thread, it is necessary to ensure that the upper line is threaded through the eyelet at both ends of the needle plate.

After the upper thread is installed, press down on the lower jaw of the sewing machine to ensure that the upper line is locked firmly.

4. How to adjust the tension of the sewing machine?

The sewing machine’s tension refers to the pressure between the upper and lower jaws of the sewing machine. When the stress is too loose, the fabric will easily slip out of the stitching line; the material will be challenging to stitch when the tension is too tight.

The sewing machine uses two methods to adjust the tension: manual adjustment and automatic adjustment.

Manual adjustment: manually adjusting the tension of the sewing machines. This method is convenient and straightforward, but it requires a lot of experience.

Automatic adjustment: automatically adjust the stitching machine’s tension by using a sensor. This method is fast, accurate, and convenient.

5. How to check whether the upper thread is installed correctly?

Use the light source to shine into the eyelets of the needle plate. If there is any shadow or bright spot inside the eyelet, the upper thread is not correctly installed.

6. How to remove the old upper thread?

When removing the old upper thread, firstly open the cover of the sewing machine, then pull off the old upper line from the eyelet of the needle plate. Then close the surface of the sewing machine.

7. How to change the upper thread?

Firstly, when changing the upper thread, unthread the old upper thread from both sides of the needle plate. After that, take the new upper line and insert it into one end of the needle plate. Finally, rethread the needle plate.

side view of sewing machine

8. How to replace the upper thread?

When replacing the upper thread, first unthread the old upper threads from both sides of the eyelet of the sewing machine. Then, take the new upper threads and insert them into both ends of the needle plates. Finally, rethread all the needle plates.

9. How to clean the upper thread?

First, use a brush to wipe off the dust on the surface of the needle plate. Second, use a damp cloth to wipe off the dirt on the surface of the upper thread. Third, rinse the upper line with water.

10. How to maintain the upper thread?

First, keep the sewing machine away from heat sources such as radiators, ovens, stoves, etc. Secondly, if the upper thread is stained, use a brush to scrub the stain gently. Thirdly, after washing, dry the upper line in an airy place. Fourthly, store the upper thread in a cool, dark place.


It would help if you did not worry because it happens to us. And yet, if you keep an eye on the stitching, you will notice that you have a loose thread, and you need to fix it as soon as possible. And for that, we have a unique guide for you, so you do not get lost.

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