How to distinguish the thickness of sewing thread? How to choose the thickness of sewing thread? Sewing thread is the thread needed for sewing clothing products, which can be divided into natural fiber, synthetic fiber sewing thread and mixed sewing thread. There are many kinds of sewing thread thickness, let's take a look below! How to distinguish the thickness of sewing thread? It is classified by the number of strands of yarn. There are different names for the thickness of sewing thread according to different materials, such as polyester staple fiber, which is called the number of strands, for example: 40S/2 (that is, 40 strands of two strands of yarn) is commonly used for sewing clothes, if it is polyester filament, generally called the number of D strands, such as: 150D/3 (it is made of 150D strands of three strands) In mainland a lot of people also can call how many, for instance: 2, 3, 4, 6, 9. How to choose the thickness of sewing thread? (1) The bobbin volume of lock stitch sewing machine is limited, and the use of thinner sewing thread can accommodate longer sewing thread, saving the time to change the bobbin and achieving high work efficiency. (2) Small size of fine sewing thread, chain sewing feel good. (3) The space occupied by fine sewing thread is very small, less cause fabric deformation and sewing wrinkle. (4) Small needles can be used for fine sewing threads to avoid needle holes in the fabric. (5) Fine sewing thread can also reduce outstanding seam marks, so that it is trapped in the inner layer of the fabric surface and reduce the impact of wear.