Sewing thread is usually made by twisting several strands of yarn side by side. There are many specifications of sewing thread, such as 202, 403, 602, 603, etc. The numbers 20, 40, 60, etc. in front of the sewing thread model refer to the number of yarns, which can be simply understood as the thickness of the yarn. The higher the number of yarns, the finer the yarn; The numbers 2 and 3 after the model indicate that the sewing thread is made of several strands of yarn twisted together. For example, 603 is made by twisting 3 strands of 60 yarn. So the sewing thread made by twisting the same number of strands of yarn, the higher the count, the finer the thread and the lower the strength; The sewing thread made by twisting yarns of the same count has more strands, thicker thread, and greater strength.