The same seam type can also be sewn with Stitch class 500 (Over edge stitch) or Combination stitches (e.g., Stitch class 516) Application. This is because 3-thread stitches are prone to seam grinning when the seam is pulled at a right angle to the seam. Therefore, it lends a professional finish to your handmade garments. Stitch types Textile stitch types-classification and terminology, stitches are catalogued into six classes (as per BS3870/ASTM D-6193/ISO 4915:1991). The stitch types in this class are formed with one or more groups of threads and have as a general characteristic that loops from at least one group of threads pass around the edge of the material. Overlocked Seam Allowance . An overedge stitch sewing device comprising a straight sewing needle and a lower looper that travels in a curved path and has advanced timing relative to the sewing needle. Select a seam class for individual seam diagrams; Seam Class Guide. The overlock stitch is a combination of a straight stitch and a zigzag. Types of stitch within each class are designated and identified by 2nd and 3rd digit. The front and back of all the other types are given below. Stitch Class 500: 6. Class 500: Overedge Chain stitch. used to create neat load bearing seams for lingerie, shirts, etc. It sews backwards and forwards in a straight line, but between every set of straight stitches, it sews a zigzag. Stitch and classification STITCH CLASS TYPE 500 FUTURES • Overedge machines must have three stitch forming devices, a needle to carry the thread through the fabric, a looper or spreader to carry the thread from the needle to the edge of material on the bottom, and a looper or spreader to carry thread up and over the edge of the material on the top. SS Class; Superimposed Seams LS Class; Lapped Seams BS Class; Bound (Binding) Seams FS Class; Flat (Butted) Seams EF Class; Edge Finish Stitching OS Class; Ornamental Stitching The stitches in this guide are the most commonly used stitches. Class 2 - Lapped seam(s) In this class of seam, two or more piles of material are lapped (i.e., with edges overlaid, plain or folded) and joined with one or more rows of stitches. Stitch Class 504(3 thread overlock) is the most common of all and is used for securing the raw edges of the fabric and for heavy fabric such as denim 514 (4-thread mock safety) is used. If done correctly, this resembles serging, which is how most store-bought clothes are sewn. Overedge Stitch 600 Class; Flat Stitch . The device may also contain a needle thread cam which is shaped such that the needle thread is in partial contact with the front surface of the needle thread cam during the needle stroke. The International Organization and standardization uses the identical numbering.