Stitch class (ISO stitch Types 500-600)

Stitch classes are designated and identified by the first digit of a “3 digit numeral system”. Type of stitch within each class are designated and identified by 2nd and 3rd digit.

ISO# 503 (Overedge)

 Stitch formed by 1 needle thread and 1 looper thread forming a purl on the edge of the seam. For Serging or Blindhemming only. One needle thread (A) and one looper thread (B).  Loops of the needle thread (A) are passed through the material and brought to the edge where they are interlooped with thread (B). The loops of thread (B) are extended from this interlooping to the point of needle penetration of the next stitch and there are interlooped with thread (A).


Thread consumption ratio = 1 : 10.5

 

ISO# 504 (Overedge) 

 

Stitch formed by 1 needle thread and 2 looper threads forming a purl on the edge of the seam. For Overedge Seaming and Serging. one needle thread (A), one lower looper thread (B), and one upper looper thread (C).  Loops of the needle thread (A) are passed through the material and interlooped with loops of thread (B) at the point of penetration on the underside of the material.The loops of thread (B) are extended to the edge of the material and there interlooped with loops of the upper looper thread (C).Loops of thread (C) are extended from this interlooping point of the needle penetration of the next stitch and there, they are interlooped with thread (A).

 


 

Thread consumption ratio = 1 : 14

 

ISO# 505 (Overedge)

 

Stitch formed by 1 needle thread and 2 looper threads forming a double purl on the edge of the seam. For Serging only. :  one needle thread (A), one lower looper thread (B), and one upper looper thread (C).  Loops of the needle thread (A) are passed through the material and interlooped with loops of thread (B) at the point of penetration on the underside of the material.The loops of thread (B) are extended to the edge of the material and there interlooped with loops of the upper looper thread (C). Loops of thread (C) are extended from this interlooping point of the needle penetration of the next stitch and there, they are interlooped with thread (A). Stitch type 505 is very similar to stitch type 504. The main difference is that in stitch type 505 the lower looper thread (B) Is tighter and the needle thread (A) is looser than in stitch type 504. Stitch type 505 is a three thread version of stitch type 503.

 


Thread consumption ratio = 1 : 16.0

 

ISO# 512 (Overedge)

 

Stitch formed with 2 needle threads and 2 looper threads with the looper threads forming a purl on the edge of the seam. two needle threads (A & A1) a lower looper thread (B) and an upper looper thread (C). Loops of the needle threads (A & a1) are passed through the material and interlooped with loops of thread (B) at the point of penetration on the underside of the material. The loops of thread (B) are extended to the edge of the material and there interlooped with loops of thread (C). Loops of thread (C) are extended from this interlooping point of the needle penetration of the next stitch and there, interlooped with thread (A).

 


 

Thread consumption ratio = 1 : 16.0


ISO# 514 (Overedge)

 

Stitch formed with 2 needle threads and 2 looper threads with the looper threads forming a purl on the edge of the seam two needle threads (A & A1) a lower looper thread (B) and an upper looper thread (C). Loops of the needle threads (A & a1) are passed through the material and interlooped with loops of thread (B) at the point of penetration on the underside of the material. The loops of thread (B) are extended to the edge of the material and there interlooped with loops of thread (C). Loops of thread (C) are extended from this interlooping point of the needle penetration of the next stitch and there, interlooped with threads (A & A1).

 


 
Thread consumption ratio = 1 : 20.0

 

ISO# 515 (Overedge)

 

This type of stitch is formed by simultaneously sewing one row of stitch 401, using threads (A & B), a specified distance from the edge of the material, and one row of stitch type 503 using threads (A1 & B1) on the edge of the material.
 

 

Thread consumption ratio = 1 : 17.5

 

ISO# 516 (Safety Stitch)

 

5-thread safety stitch. Combination stitch consisting of a single-needle chainstitch (401) and a 3-thread overedge stitch (504) that are formed simultaneously. one row of stitch 401 (A & B) a specified distance from the edge of the material, and one row of stitch type 504 (A1 , B1 & C) on the edge of the material.



 

Thread consumption ratio = 1 : 20.0

 

ISO# 602 (Coverstitch) 

 

Stitch is formed with 2-needle threads, a top cover thread and a bottom looper thread. :  two needle threads (A) and (A1) ; one looper thread (B); and one cover thread (C).  Loops of thread (A) and (A1) are passed through loops of thread (C) already cast on the surface of the material, and then through the material where they shall be interlooped with loops of thread (B) on the underside.
                

 

Thread consumption ratio = 1 : 20.0

 

ISO# 605 (Coverstitch) 

 

Stitch is formed with 3-needle threads, a top cover thread and a bottom looper thread. three needle threads (A), (A1) & (A2) ; one looper thread (B); and one cover thread (C).  Loops of thread (A), (A1) and (A2) are passed through loops of thread (C) already cast on the surface of the material, and then through the material where they shall be interlooped with loops of thread (B) on the underside.


                

Thread consumption ratio = 1 : 27.0


ISO# 607 (Coverstitch)

 

Stitch is formed with 4-needle threads, a top cover thread and a bottom looper thread. four needle threads (A), (A1), (A2), and (A3); one looper thread (B); and one cover thread (C). Loops of thread (A), (A1), (A2), and (A3) are passed through loops of thread (C) already cast on the surface of the material, and then through the material where they shall be interlooped with loops of thread (B) on the underside.

                

Thread consumption ratio = 1 : 27.4


 

References:-. Coats, amefird.com and other web articles 

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