A fastening system comprising a screw component (10) and a seat component (20), the screw component (10) comprising a shaft (12) extending along a longitudinal axial line (5) and having a maximum radius R1, said shaft (12) comprising a threaded section (13), further comprising said screw component (10), at one end of the shaft (12) of the screw, a head (14), comprising the head (14) a lower end (15) having a maximum radius R2 greater than the axis (12) of the screw, such that an exposed lower side (18) of the head (14) of the screw extends radially further beyond the maximum radius of the axis (12) of the screw, the seat component (10) comprising a channel (21) of the screw comprising a flat seat (22) of the screw having a minimum radius R3, which is equal to or greater than R1, the lower end (15) of the head (14) of the screw comprising an annular contact surface (C) to rest against said seat (22) of the screw, said annular contact surface (C) being formed by the distal end of at least one projection (17) extending downward on the lower side of the head (14) of the screw, the annular contact surface (C) having a minimum radius greater than the minimum radius of the seat (22) of the screw such that, in use, the innermost area of the seat (22) of the screw does not it is in contact with the head (14) of the screw, in which the one or more projections (17) progressively narrow at least on its radially inner side and the screw component (10) comprises a cutout (11) in the transition between the axis (12) of the screw and the head (14) of the screw, such that the progressive narrowing of the one or more projections (17) begins radially inward of R1.Un sistema de sujeción que comprende un componente de tornillo (10) y un componente de asiento (20), comprendiendo el componente de tornillo (10) un eje (12) que se extiende a lo largo de una línea axial longitudinal (5) y que tiene un radio máximo R1, comprendiendo el citado eje (12) una sección roscada (13), comprendiendo a
