Abstract: System (100) for checking the presence of thickness restrictions on at least one mechanical component (1), comprising at least one base (2) for fixing said mechanical component (1) coming from a production line (200) to a plurality of fixing points (L1, L2, L3), and measuring means (3) to measure the thickness of said mechanical component (1) next to at least one control point (P) of said mechanical component (1) to be checked, characterized in that said measuring means (3) comprise at least one mechanical robotic arm (30) adapted to be moved in the direction of said at least one control point (P), wherein said mechanical robotic arm comprises at least one ultrasonic probe (31) for the ultrasonic measurement of the thickness of said mechanical component (1) next to said at least one control point (P), said ultrasonic probe (31) being positionable in the proximity of said at least one control point (P) so that the ultrasonic wave emitted by said ultrasonic probe (31) travels along a direction (Q) substantially