A bone plate fixing device comprises a first bone contacting element with a rod-shaped connecting member and a second bone contacting element displaceable on the connecting member. The connecting member has a first portion with a first diameter and a second portion comprising a protruding projection, the protruding projection being located towards a proximal end of the connecting member and having a second diameter that is greater than the first diameter. The protruding projection may comprise at least two teeth. The depth of the at least two teeth may be less than half the difference between the first diameter and the second diameter.