4-cavity Round Part Injection Mold

4-cavity round part injection mold produces four identical circular plastic parts per injection cycle, doubling or quadrupling output compared to a single-cavity mold. The 3D rendering shows both mold halves with four cavities and a balanced runner system.

Balanced Runner Design

A balanced runner layout ensures that all four cavities fill at the same time and with the same pressure. This produces parts of consistent weight and dimension. The runner system may be cold (conventional) or hot (hot runner), depending on part size and production volume.

Features

• Four identical cavities for high output.

• Balanced runner for uniform fill.

• Ejector pins in each cavity.

• Cooling channels for fast cycle time.

• Precision machined cavity inserts.

Typical Parts

Four-cavity molds produce caps, lids, bushings, circular fittings, and small round plastic components. The 4-cavity layout is a sweet spot — it doubles output over a single-cavity mold without the high cost of a 16- or 32-cavity tool.

Material and Tolerance

Cavities are typically machined from pre-hardened P20 steel or hardened H13 for high-volume production. Cavity inserts are interchangeable, allowing replacement without remachining the entire mold. Part tolerances of ±0.02 mm are achievable on precision molds.

Conclusion

The 4-cavity round part injection mold balances productivity and mold cost. It is the standard choice for medium-volume production of small circular plastic components.