Twenty nine sewing threads belonging to eight categories were analyzed in terms of simple-, loop- and knot-tensile properties. The structure of sewing threads and fibers constituting the threads influence the strength of the sewing threads. Tensile strengths, breaking extension and specific work of rupture in loop and knot forms are lower compared to that obtained in simple tensile test. Threads exhibit less ductility when stretched in loop and knot forms. Spun threads have higher relative- tenacity, extension and work of rupture. Heavier threads have lower relative tenacity, extension and specific work of rupture compared to the finer ones.
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