Abstract: An arrangement for fitting a mold tool in an injection molding machine which has first and second mold tool mounting plates, comprises an array of lower support arms on each plate for supporting the mold tool in a precisely aligned position in respect of height relative to the plate, lateral guides for aligning the mold tool in a lateral direction, clamping elements for fixing the portions of the mold tool on the respective plates, and connecting means on the mold tool and the machine for the supply to the mold of power, blowing air, a tool temperature control agent and the like. Each array of arms provides a guide surface extending perpendicularly away from the plate on which they are disposed, while the lateral guide means have guide surfaces which converge towards the respective plate and towards the center line thereof. The tool is displaceable towards the respective plates on the respective guide surfaces of the arrays of arms, by movement of the plates one towards the other.