What is it?
A 3-thread overlock uses one needle and two loopers. It wraps the fabric edge to reduce fraying, with less bulk than a 4-thread stitch.
When should you use it?
- Finishing seam allowances on woven garments
- Neatening edges before hemming
- Light seams on low-stress areas
- Lighter fabrics where bulk matters
What fabrics work well?
Light to medium wovens and many knits. Using the right needle gives a narrower stitch; the left needle gives a wider one.
How many threads?
Three: one needle thread and two looper threads.
What should the finished stitch look like?
One straight needle line with looper threads meeting cleanly at the cut edge — not pulled over the edge or hanging loose beyond it.
Common problems
- Fraying edges — check the blade is trimming cleanly
- Loose loops — rethread the loopers and check tension discs
- Not strong enough for a seam — consider a 4-thread overlock instead
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