By radial shrinking of a hydraulically pre-extended external body GripLoc generates a radial stress on the two shaft or axle stubs to be connected. GripLoc is to be clamped and released rapidly.The different GripLoc characteristics by SCHAAF can be combined among each other. So for example GripLoc can be built integrated together with the SafeLoc mechanism in a removable Hydraulic Nut. An optimal solution is therefore guaranteed for each application.