Where letters are used to indicate the size, A is finer while D is heavier. Due to having special finishes, mercerized threads are found to be smoother. General purpose threads are a form of threads primarily used on light and medium fabrics, while the usage of the heavy duty threads is common where the stitches require extra strength like in many upholstery projects. Polyester, cotton, nylon, silk, and cotton wrapped polyester with nearly size 50 are a few samples of the general purpose threads. The threads having size of above 50 are finer, best suited for sheer fabrics. The polyester, coarse cotton and cotton-wrapped polyester threads containing approximate size 40 are known as the heavy duty threads suitable for sewing heavy vinyl, coating or upholstery fabrics.
Have a look at Right Sized Thread for Different Fabrics
- A mercerized thread having a size of approximately 60 is good for light weight fabrics such as batiste, crepe, chiffon, etc. This thread is 100% polyester or cotton wrapped polyester.
- A mercerized thread having a size of 50 is perfect for medium weight fabrics like corduroy, flannel, muslin, gabardine, linen, gingham, wool crepe, etc. The product can be 100% polyester or cotton wrapped polyester.
- A mercerized thread containing a size of approximately 40 is best suited for medium heavy weight fabrics like bonded wovens, coating, canvas, duck, denim, sailcloth, etc.
- For knits such as double knits, bonded knits, tricot, jersey, etc., somewhat fine polyester, or cotton wrapped polyester threads are a great choice.
Several Useful Tips for Choosing the Right Sewing Thread
- First of all, consider the strength of the thread and the purpose it will be used for.
- All-purpose polyester threads are suitable for many projects done using a sewing machine.
- Check its compatibility with the fabric’s structure and choose the one that is similar in fiber content of the fabric for sewing projects.
- Now match thread’s color with the most dominant color in the fabric. If you find a problem, in this regard, then it is wise for you to select the one that is one or two shades darker. You are not recommended to go for lighter shades.
- Use polyester thread for stretchy or synthetic fabrics.
You can also opt for fine cotton or silk threads for delicately woven fabrics like lingerie or sheer garments.