The process of creating diecast models

Introduction

Ever wondered how your favourite diecast models are actually made? Behind every car, aircraft or tank is a detailed production process that turns a 3D design into a finished collectible.

In this guide, we’ll walk through the main stages of diecast manufacturing, from initial design to final quality checks, so you can better appreciate the work that goes into each model on your shelf.

1. Design

The process starts with a detailed 3D design using CAD software.
Every part—body, wheels, interior and small details—is planned out, often based on real vehicles or reference drawings.

At this stage the manufacturer decides the scale, features and level of detail the finished diecast model will have.

2. Tooling & Mould Making

A metal mould (die) is created, usually from hardened steel.
The mould has cavities shaped exactly like the parts of the model and is made in two halves.

These precision tools are expensive to produce, which is why limited production runs can make certain diecast releases more collectible.

3. Die Casting

A zinc alloy (often Zamak) is melted down.
The molten metal is injected into the mould under high pressure.
It quickly cools and solidifies into the shape of the body or other parts.
The part is removed and the mould is reused many times.

This step gives diecast models their weight and solid feel compared with plastic toys.

4. Cleaning & Polishing

Any excess metal from the casting process is trimmed away.
Parts are smoothed and polished to remove rough edges and imperfections.

Clean casting and polishing are key to sharp panel lines and neat details on the finished model.

5. Painting

Models are painted in several layers: primer, base coat and clear coat.
Tampon (tampo) printing is used for fine markings like logos, serials, nose art and racing stripes.

High-quality paint and printing make a big difference to how a diecast collectible looks in a display.

6. Assembly

Diecast metal parts are combined with plastic, rubber and sometimes fabric components.
Interiors, dashboards, windows, tyres and other details are fitted.
Moving features such as opening doors, hoods or gear are added at this stage.

This is where the model really starts to come to life.

7. Quality Control & Packaging

Each model is checked for paint flaws, loose parts and accuracy.
Once approved, it’s packed with a collector box, inner packaging and often a display stand.

Careful packaging helps protect the model in transit and keeps value higher for collectors who care about condition.

Conclusion

From initial CAD drawing to the final check in the packing line, creating a diecast model is a detailed, multi-stage process. Understanding how diecast models are made makes it easier to judge quality, appreciate the craftsmanship involved and see why some releases become more desirable than others.

If you’d like to see the results of this process, explore our selection of diecast models from brands such as Corgi, Hobby Master and Others. Each model is inspected, graded and photographed so you know exactly what you’re buying.

For more on how production quality and condition affect value, see our Beginners Guide To Diecast Model Collecting blog.