A system for monitoring the wear of a solid plate which, when being in use, has a surface being exposed to abrasive wear, the solid plate being a metal plate of a vehicle, the system comprising:
- a through boring in the solid plate, the boring having a boring longitudinal axis, a substantially cylindrical part, and an end part adjacent said surface, the end part having an end part surface being at least partly conical in cross-section along the boring longitudinal axis, and
- a counter-sunk head screw having a screw longitudinal axis, a shaft fitting into the cylindrical part of the boring, and a head with an underside being at least partly conical in cross-section along the screw longitudinal axis,
- wherein a first angle between the underside and the screw longitudinal axis is bigger than a second angle between the surface of the end part and the boring longitudinal axis, and a sensor is positioned at a fixed position on a side of the solid plate being opposite to said surface and being adapted to measure a change of a distance between a tip of the screw and the sensor.