Slide fastener having discrete coupling elements

In a slide fastener of the type including a pair of stringer tapes, and a series of uniformly spaced fastener elements carried on each of said stringer tapes, each of the fastener elements having generally rectangular body which has a coupling end portion and a pair of parallel spaced apart legs extending rearwardly therefrom to hold a longitudinal edge portion of said stringer tapes therebetween, said coupling end portion projecting beyond the longitudinal edge at right angles to the axis of the slide fastener, and having a rounded head and a neck integral therewith, said head and said neck being complementary in shape to each other, said neck portion being defined by a pair of recesses disposed symmetrically with respect to the axis of said body, the improvement wherein said head portion has a pair of openings formed in the rounded front end face thereof, each of said openings being defined by a pair of parallel spaced apart, opposed upper and lower flat walls and a pair of vertical walls extending therebetween, said vertical walls extending at an angle to each other, and said neck portion including a pair of lugs at sides thereof adjacent said legs, said lugs being complementary in shape to said openings and so disposed as to snugly fit in the corresponding openings of adjacent fastener elements of the companion stringer tape when the fastener elements on said tapes are coupled together, said lugs having flat surfaces that engage respective upper and lower flat walls of said openings to limit relative tilting displacement of coupled adjacent fastener elements when said tapes are flexed.