China Industrial sewing machine parts on sales tell you that overlock sewing machines are divided into 3-thread, 4-thread, and 5-thread overlock sewing machines, among which 3-thread overlock sewing machines (overlocking machines, side-locking machines) and 5-thread overlock sewing machines are widely used. China Industrial sewing machine parts on sales tell you that interlock sewing machines are mainly used for knitting cotton wool fabrics, single jersey splicing, rolling collars, piping, hemming, interlock sewing, etc. for knitted underwear.

China Industrial sewing machine parts on sales tell you that a chain stitch is made up of two threads that look flat when viewed from the front and chain when viewed from the back. It has more elasticity and strength than flat seams and is used for cut and knitted products.
China Industrial sewing machine parts on sales tells you that overlock thread has 3 threads in one needle and 4 threads in two needles, and it is used to sew the two fabrics together when cutting the edge of the fabric for cutting products. Compound seams with double chain stitches next to overlock seams of safety stitches. There are 2 needles, 5 needles, 3 needles, 6 needles, etc. for work clothes, chinos, jeans, etc.
Through the above introduction and analysis of China Industrial sewing machine parts on sales, hope it helps you.