Bartacking is a type of reinforcement stitching used by the fabric and textile industries to fortify stress points in clothing, sporting equipment, uniforms, and a host of other products. The bar tack stitch is a tight zigzag pattern repeated perpendicularly over itself several times to make sewn products stronger, and resistant to tears or rips in the seams. Commercially, either a special bartacking machine or an industrial sewing machine with a bar tack attachment can be used for this purpose.

http://www.wisegeek.com/what-is-bartacking.htm

Vet at det er noe som heter overlock, men der brukes det flere tråder samtidig, og det virker som om det brukes i kanter.

Hensikten med denne sømmen (bar tac) er å sikre at den ikke løsner. Bar tac er ikke i bruk, så da blir mitt beste forslag sikkerhetssøm.