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interlock

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Lockstitch and interlock seams are the same thing. Interlock seams are the sorts of seams common sewing machines make.  The other common machine seam is an overlock seam, which is what sergers make. There are two threads in an interlock seam which are crossed for each stitch such that the loop of one thread over the other is what joins the two fabrics.

There’s a good page on interlock seams at Wikipedia. There’s also information on various sorts of seams including interlock/lockstitch at How Stuff Works.

Synonyms:

lockstitch
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