516 Class Stitch

Five Thread True Safety Stitch Using Two Needle and Three Looper Threads
Stitch combines Fed. Class 401 stitch with Fed. Class 504 stitch

Typical uses; Overedge Stitch for Seaming Knits or Wovens
Stitch has a medium bite and Moderate Stretch for Seaming on Knits or
Woven Fabrics. Stitch has medium elongation along the edge of fabric
with better coverage on the fabric edge

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Juki MO6700

A True Safety Stitch will hold a seam despite a thread failure

516 Class Stitch Partial Failure