Injection Mold Design Guide _top_

| Mold component | Common steel | Hardness | Application | |----------------|--------------|----------|--------------| | Cavity / Core | P20 | ~30 HRC | Low-to-mid volume (<500k shots) | | Cavity / Core | H13 / S7 | 48–52 HRC | High volume, abrasive resins (glass-filled) | | Slides / Lifters | D2 / A2 | 58–60 HRC | Wear surfaces | | Mold base | 4140 / 1050 | ~28 HRC | Plates, support pillars |

The plastic solidifies inside the temperature-controlled mold. injection mold design guide

The gate is the entry point for the molten plastic. Its location and type determine how the cavity fills and how the part packs out. | Mold component | Common steel | Hardness