A row of fastener elements for a slide fastener comprises a continuous spiral-shaped thread having a varying pitch, each whorl of the spiral thread having two legs which are substantially superimposed, and each whorl being separated from each other whorl, each whorl having at a first end portion thereof a deformation to serve as a tooth of a fastener element. In such a construction, the connecting sections between the successive whorls, opposite the teeth, each have a respective bend facing towards the teeth and the totality of said bends forms a series of notches along the corresponding longitudinal edge of the row of fastener elements. When the row of fastener elements is secured by stitching onto a backing tape, the stitching consists of two parallel longitudinal rows, one of said rows being at an intermediate point in the space between the teeth and the connecting sections, preferably close to the connecting sections, and the other being along the edge of the row of fastener elements opposite to the teeth and disposed inside the notches. Advantageously, the stitching is double chain-stitch made with two needles, the chains being positioned over the end of the whorls opposite to the teeth.