An injection-moulding system for an injection-moulding machine (1) comprises a clamping assembly (15,16), a temperature-adjusting system, and an ejector. The clamping assembly (15,16) comprises two horizontal beams (29) for mounting on the platens (2,3) of the injection-moulding machine (1) and two vertical beams (30) for crosswise mounting on the horizontal beams (29) in multiple positions. The clamping assembly allows dies (17,18) of various sizes to be clamped in one and the same machine. The temperature-adjusting system comprises at least one cooling tube (69) for detachable insertion into a blind hole (68) formed in the die. The cooling tube (69) is attached to coolant conduits (66,67), which is permanently attached to a source of coolant (65). Dies can thereby be replaced quickly and easily without spilling any coolant. The ejector is adapted to eject the cooled product (23) after opening of the die. The injector pins (22) are in an inexpensive way glued to the ejector plate (21). Using of the injection-moulding system causes considerably cost saving.