Choosing the right fittings is often the deciding factor between a perfect seam and a damaged product. Many beginners, when buying expensive sewing equipment, forget that the quality of the stitch depends 50% on the thread used. Incorrectly selected thickness or material can lead to breaks, looping and even breakage of the needle.
The modern market offers a huge variety of options, from classic cotton to high-tech polyamide. Understanding this diversity the first time is difficult, but necessary for comfortable work. In this article we will look in detail at which threads are better Suitable for different types of fabrics and operating modes of your machine.
Understanding the markings and properties of materials will allow you to avoid common mistakes and save time on alterations. You will learn how to select the perfect needle and thread pair for any project.
Main types of threads by material of manufacture
The fundamental selection criterion is always the material from which the thread is made. It is this that dictates the strength, elasticity and appearance of the future seam. The most common today are synthetic options, in particular polyester. This is a universal soldier in the world of sewing: such threads are durable, do not fade, are resistant to abrasion and are suitable for fabrics, from knitwear to raincoats.
Natural cotton remains indispensable for working with natural fabrics, especially if the product will be subjected to high heat treatment, for example, ironing at high temperatures. Cotton threads shrink less when washed with fabric, but they are less tensile than synthetics and can rot if left in a damp environment for long periods of time.
For elastic fabrics and items subject to strong stretching, thread with the addition of elastane or consisting entirely of it. It has the unique ability to stretch along with the fabric without tearing. However, it is more difficult to work with it on a regular machine; fine adjustment of the tension is required.
- 🧵 Polyester: high strength, resistance to chemicals and sun, versatility of use.
- 🌿 Cotton: naturalness, good tolerance to high temperatures, matte shine.
- ⚡ Nylon: exceptional strength and elasticity, but is afraid of ultraviolet radiation and high iron temperatures.
⚠️ Attention: Never use 100% nylon thread for sewing clothing that will be ironed frequently with a hot iron. Synthetics may melt and stick to the soleplate of the iron or damage the structure of the fabric.
Decoding the numbers and thickness of the thread
One of the most confusing things for beginners is numbering. Unlike many other measuring systems, the reverse logic applies here: than more number, the thinner the thread. This is critically important to understand when selecting accessories for a specific fabric and needle.
On reels you can often find double markings, for example, 40/2 or 50/3. The first number indicates the linear density (thickness) of a single thread, and the second number indicates the number of such threads twisted together. So a 40/2 thread will be thinner than a 40/3 thread, but both are thinner than a 20/3 thread.
For household sewing machines, the optimal range is considered to be between 40 and 60. Finer threads (number 80 and above) are used for delicate tasks, such as hemming trousers or working with silk, where puncture marks should be minimal.
If you are unsure of the thread number, look at the recommended needle gauge listed on the spool package. Matching the needle number and thread thickness is the key to a clean stitch.
Using a thread that is too thick in a household machine can cause the shuttle mechanism to malfunction. The upper thread will get stuck, creating knots and loops on the back of the project.
Correspondence table for threads, needles and fabrics
To systematize knowledge and be able to quickly navigate the selection, it is convenient to use a pivot table. It helps to avoid situations where they try to stitch the finest silk with thick denim thread, or vice versa.
| Fabric type | Recommended thread number | Needle type | Thread material |
|---|---|---|---|
| Silk, chiffon, cambric | 75 - 90 | No. 60-70 (sharp end) | Natural silk, thin polyester |
| Cotton, linen, viscose | 50 - 60 | No. 75-90 (sharp end) | Cotton, LL (lavsan-flax) |
| Knitwear, jersey | 40 - 50 | No. 75-90 (rounded end) | Polyester with elastane |
| Jeans, thick jacket | 30 - 40 | No. 100-110 (reinforced) | High twist polyester |
The table shows average values. It is always worth doing a test stitch on a scrap piece of the same fabric folded in two layers. This will allow you to evaluate the tension and appearance of the seam before starting work on the main product.
Color scheme and shade selection
The choice of color is not only about aesthetics, but also about functionality. The classic rule is: the thread should be one or two shades darker than the fabric. On a light fabric, a dark thread will be less noticeable than a light thread on a dark background, since it falls into the shadow of the stitch.
However, modern decorative techniques dictate their own rules. For finishing stitching, on the contrary, contrasting colors are chosen to emphasize the cut lines. In such cases, the quality of the thread must be ideal, since any defect will be obvious.
- 🎨 Monofilament: clear line, ideal for blind hemming or when color cannot be matched.
- 🌈 Floss: used only for hand embroidery or decorative seams on special machines with an upper conveyor.
- ✨ Metallized threads: require the use of special needles with a larger eye and a reduced sewing speed.
⚠️ Attention: Cheap threads with uneven dyeing can fade during the first wash, ruining the appearance of the entire product. Always check color fastness by running a damp white disc over the winding.
Sewing problems and their solutions
Even the most high quality threads may behave unpredictably if the sewing technology is disrupted. The most common problem is a broken upper thread. This may occur due to the material being too dry, too much tension, or burrs on the needle.
Looping at the bottom often indicates that the top thread is too tight or is not catching the hook. Sometimes the reason is simple: the thread flew out of the tensioner during threading. In this case, it is necessary to completely refill the machine by lifting the foot.
☑️ Diagnosis of thread breakage
If the thread constantly tangles and forms a beard under the fabric, check that the bobbin is inserted correctly. The direction of winding the bobbin thread should be according to the instructions for your machine model (usually counterclockwise).
Why does the thread break when sewing leather?
When stitching the skin, high resistance is created. Regular thread may not be able to withstand the tug. Use a Teflon foot, a special needle with a triangular point and lubricate the puncture site with silicone.
How to store threads so they don't spoil
The shelf life of sewing accessories is practically unlimited, but storage conditions play a decisive role. Polyester and nylon can last for decades if protected from direct sunlight. Ultraviolet radiation destroys polymer bonds, making the thread brittle.
Humidity is the second enemy. In damp rooms, cotton threads can become damp and begin to mold, which will lead to the thread rotting inside the seam of the finished product. A dry, dark place in a closet or special organizer is the ideal solution.
Avoid storing loose coils in a drawer where they could get tangled with each other or get caught on other objects. Using compartment organizers or vertical holders will extend the life of your collection.
Properly storing thread away from light and moisture will ensure that even old stock will remain flexible and durable over the years.
Frequently asked questions (FAQ)
Can I use hand sewing thread in a machine?
Strongly not recommended. Hand sewing threads often have a fuzzy surface and less tensile strength when passing through the eye of the needle at high speeds. They will constantly tear and clog the mechanism.
What to do if the thread constantly gets tangled at the beginning of the stitch?
This is the classic tail-pulling problem. Before starting to sew, always pull the top and bottom threads under the foot and hold them with your hands by the tails while making the first 3-4 stitches.
How can you tell if the thread has gone bad?
Try stretching a section of thread between your fingers. If it tears easily, becomes crunchy, or looks dry and brittle, it should not be used. Also a sign of deterioration is a change in color or the appearance of stains.
Are reinforced threads suitable for any fabric?
Reinforced threads (for example, LL) are very strong, but they are rigid. For thin natural fabrics (silk, cambric), they can be rough and leave noticeable punctures. Their element is dense mixed fabrics and denim.