Locking tool for screw connections with polygonal engagement bodies of different size

The invention relates to a locking tool for screw connections with polygonal engagement bodies of different size, which are designed, for example, as a nut or a screw head. The locking tool contains two socket wrenches which lie one inside the other and can be manually rotated separately and of which the inner socket wrench can be moved axially to a limited extent, but by at least its slip-on length, relative to the outer socket wrench and can be clamped into an end position by a compression spring attached between the two. In this position, the outer socket wrench alone can be slipped onto its allocated polygonal engagement body of the screw connection, for example onto a hexagon nut, without the inner socket wrench touching the engagement body allocated to it, for example a screw head. The two engagement bodies can then be restrained against one another by one-hand operation of the locking tool, there being limited radial mobility of the engagement bodies relative to one another, which permits adjustability.