Commonly used sewing thread models 202203402403602603 and so on. The line is usually composed of several strands of yarn twist and tie into, sewing thread model in front of 20, 40, 60, refers to the yarn count, yarn count can be understood as a simple yarn thickness, number higher, more fine yarn; behind the model 2, 3 are respectively the sewing thread is made of several yarn twist and. For example: 603 is composed of 3 stocks and 60 yarn and twisted into. So the same number of yarn twist and the sewing line, line number higher, more fine, strength is smaller; and the same count yarn twist and a sewing thread, number more, more thick, more stronger. Line thickness: 203 > 202 > 403 > 402 = 603 > 602 line intensity compared with similar line thickness! Generally speaking: 602 line used for thin fabrics, such as summer wear silk, georgette; 603 and 402 line can be general, is the most common sewing thread, general fabrics can be used, such as cotton, linen, polyester, viscose and other commonly used fabrics; 403 line used for thick fabric, such as made of wool fabrics; 202 and 203 line may also be referred to as the cowboy line, line is thick, high strength, much used in denim, bags and other sewing.