A fastening system according to the present invention comprises a screw component (10) and a seating component (20). The screw component comprises a shaft (12) extending along a longitudinal axis (5) and having a maximum radius R 1 , said shaft comprising a threaded section (13), said screw component further comprising, at one end of the screw shaft, a head (14), the head comprising a bottom end (15) having a larger maximum radius R 2 than the screw shaft such that an exposed underside (18) of the screw head extends radially beyond the maximum radius of the screw shaft. The seating component comprises a screw channel (21) comprising a planar screw seat (22) having a minimum radius R 3 which is equal to or greater than R 1 . The bottom end of the screw head comprises an annular contact surface for abutment against said screw seat, the contact surface being formed by the distal end of at least one downwardly extending protrusion (17) on the underside of the screw head, wherein the annular contact surface has a minimum radius greater than the minimum radius of the screw seat..Se describe un sistema de sujeción de acuerdo a la presente invención que comprende un componente (10) de tornillo y un componente (20) de asentamiento. El componente de tornillo comprende una columna (12) que se extiende a lo largo de un eje longitudinal (5) y que tiene un radio máximo R1, la columna comprende una sección roscada (13), el componente de tornillo comprende además, en un extremo de la columna de tornillo, una cabeza (14), la cabeza comprende un extremo inferior (15) que tiene un radio máximo R2 más grande que la columna de tornillo, tal que un lado inferior expuesto (18) de la cabeza de tornillo se extiende radialmente más allá del radio máximo de la columna de tornillo. El componente de asentamiento comprende un canal (21) de tornillo que comprende un asiento de tornillo plano (22) que tiene un radio mínimo R3 que es igual a o mayor que R1. El extremo inferior de la cabeza de torni
