A plastic die casting mold supplier builds the precision steel dies that shape molten Zamak zinc alloy into connectors, hardware, lock components and decorative trim. Hot chamber machines inject zinc at 400-440 °C into an H13 die held at 150-220 °C, and the tool — not the machine — decides tolerance, porosity and cycle time. This guide explains how these dies are designed and what to verify before ordering.
What a plastic die casting mold supplier delivers
- Multi-cavity Zamak 3, Zamak 5 and ZA-8 dies for connectors, clips, brackets and hardware
- Trim tools and fixtures that de-gate sprues and flash after the casting cycle
- Insert molds that place steel pins or threads into the shot before solidification
- Refurbishment services: re-cutting cavities, re-polishing and replacing ejector pins
A zinc die casting die is cut from H13 (4Cr5MoSiV1) hardened to 45-50 HRC. Because zinc at 400-440 °C barely attacks steel, these tools avoid the nitriding that aluminium dies need, and a well-maintained die can survive hundreds of thousands of shots. Any quoted die casting tool life should be stated with a maintenance interval, not as a single optimistic number.
Die design details that decide quality
- Shrinkage allowance 0.6-0.8% on cavity dimensions for Zamak 3
- Draft angles 0.5-1.5° external, 1.0-1.5° internal
- Vent gaps 0.1-0.2 mm at the parting line and last-fill areas
- Minimum wall 0.5 mm, achievable because zinc stays fluid far longer than aluminium
- Ejector pins on non-cosmetic faces; zinc is soft and marks easily
Process window around the die
Hot chamber die casting mold cycles are short: bath temperature 400-440 °C, die temperature 150-220 °C, fill time 7-20 ms and total cycle 4-8 s, with intensification pressure holding during solidification to feed shrinkage. Gate design matters more than press tonnage — thin walls need higher injection pressure, and porosity appears wherever venting lags behind fill.
Questions to ask a plastic die casting mold supplier
- Which H13 supplier and hardness block will the die use, and what tool life is guaranteed?
- How are vents placed at deep cavities, and what scrap rate do you see from porosity?
- What is the shrinkage allowance per alloy, and how are tight-tolerance features machined?
- Can you supply trim fixtures and spare ejector pins together with the die?
- What lead time applies, and do you run T0 shots on our alloy before shipment?
Zamak die casting tooling belongs with the other mould families in our plastic molds category. For adjacent melt-based options, see our blow molding vs injection molding comparison and injection molding process parameters guide. Qualified suppliers are listed in the company directory.
Related product categories
The materials and part types discussed above are grouped in our sourcing directory:
