Abstract: Mating closure part for a tailgate lock or door lock comprising a closure part with latch or the like and a mating closure part interacting therewith, having a closure member (2), in particular in the form of a closure block or closure bracket, which can be gripped by the latch and which, in order to generate a starting torque in closure direction (X), can be displaced from an open position (FIG. 3) into a closed position. The displacement of the closure member (2) is derived from the displacement of a threaded engagement part (spindle nut 3, 4) engaging in the thread of a rotationally driven spindle (5, 6).