Abstract: A carrier strip (1) for nails (3) or other securing elements to feed an automatic nailing machine, which is characterized by a series of cartridges (2), whereby each cartridge (2) holds a nail (3). The cartridges (2) have a cylindrical central body (4) finished off at the ends by a wider base (6) and crown (7), with a special feature in which the transition between the central body (4) and the base (6) and crown (7) is carried out by conic geometry. Furthermore, the vertical reinforcement of the cartridge (2) is provided by two lateral pillars (5), parallel to the longitudinal axis (18) of the central body (4), which links the base (6) and the crown (7) without coming into contact with the central body (4).