Custom Die Casting Service
Die casting produces complex metal parts with tight tolerances and excellent surface quality at high production volumes. We manage the full chain in-house: mold design, tooling, casting, CNC finishing and surface treatment.
Aluminum Die Casting
Lightweight, corrosion-resistant parts with good strength-to-weight ratio — housings, frames, brackets and structural components.
- High dimensional stability
- Thin-wall capability
- Excellent thermal properties
- Good machinability
Zinc Die Casting
High precision, thin walls and complex geometries with excellent detail reproduction — small housings, connectors and mechanical parts.
- Tight tolerances
- Smooth as-cast surfaces
- Plating-ready finishes
- High production efficiency
Post-Processing
CNC machining, tapping, surface finishing and assembly done in-house so cast parts arrive ready for installation.
- Precision machining of critical faces
- Threads & inserts
- Anodizing, powder coating & plating
- Assembly & inspection
Aluminum, Zinc and Magnesium Alloys for Die Casting
We cast aluminum, zinc and magnesium alloys on 58–800 T automatic die-casting machines with dedicated alloy furnaces. Source: First Mold die-casting page, https://firstmold.com/die-casting-service/
The Die Casting Process — 10 Steps Under One Roof
In-house mold room, die casting, CNC and post-processing in one place — no vendor hand-offs between casting and finished part. Source: First Mold die-casting page, https://firstmold.com/die-casting-service/
Mold Design & Development
Part geometry, gating, overflow and cooling layout reviewed with mold-flow simulation before steel is cut.
Die Casting Mold Making
Dies are machined from high-durability S136 mold steel, built in-house for full control of fit and finish.
Product Die Casting
Molten alloy is injected into the die at high pressure on 58–800 T machines; cycles repeat automatically for consistent parts.
Gate Removal & Deburring
Gates, runners and flash are trimmed and parts are deburred to spec.
CNC Machining
Critical faces, bores and mounting features are precision-machined to drawing.
Tapping & Drilling
Threads and holes are added with CNC tapping and drilling stations.
Grinding & Polishing
Parting-line witness and rough surfaces are ground and polished for appearance or plating.
Quality Inspection
Dimensional, porosity and surface checks at every stage — over 98% pass rate in full-scale inspection.
Surface Treatment
Anodizing, powder coating, plating or painting applied per specification.
Final Inspection & Assembly
Final dimensional audit, assembly of sub-components and approved packing for shipment.
Tolerances and Wall Thickness in Die Casting
Die casting holds tighter tolerances than sand casting and supports thinner walls than most molding processes. Values per ISO 8062-3 tolerance grades and general DFM references. Industry-standard reference (ISO 8062-3 / DME mold-class convention)
| Alloy | Min. Wall Thickness | Typical Wall | Dimensional Tolerance |
|---|---|---|---|
| Aluminum (A380 / ADC12) | 0.8 – 1.0 mm | 1.5 – 3.0 mm | ±0.05 mm precision features, ±0.15 mm general |
| Zinc (Zamak 3 / 5) | 0.5 mm | 1.0 – 2.5 mm | ±0.025 mm achievable on small features |
| Magnesium (AZ91D) | 1.0 mm | 2.0 – 3.5 mm | ±0.10 mm general |
| Draft angle (all) | 0.5° min | 1° – 2° recommended | Required for ejection |
| Machine range | 58 T smallest | — | 800 T largest |
| Surface finish as-cast | Ra 1.6 μm | — | Ra 0.8 μm with polish |
Post-Casting: Finishing Your Die Cast Parts
One-stop customization — from raw casting to ready-to-install component, all in-house. Source: First Mold die-casting page, https://firstmold.com/die-casting-service/ / MOLDITQUICK facility data (Dongguan Guohong Precision, 10,000 m² plant, 280 staff)
CNC machining of critical faces — bores, sealing surfaces and mounting bosses machined to drawing tolerance.
Tapping, drilling & inserts — threads, standoffs and threaded inserts added after casting.
Vibratory & manual deburring — clean edges on every feature, including internal passages.
Polishing & high-gloss finishing — from functional matte to decorative mirror surfaces.
Anodizing & powder coating — corrosion protection and color for aluminum parts.
Plating (chrome, nickel, zinc) — wear, conductivity and decorative finishes for zinc parts.
Painting & pad printing — logos, scales and brand marks.
Assembly & inspection — sub-assembly, function testing and full dimensional reports.
Die Casting vs Injection Molding: Which Process Fits?
The right process depends on material, strength, volume and budget. Numbers from our production lines. Source: First Mold die-casting page, https://firstmold.com/die-casting-service/ / Source: First Mold injection-molding page, https://firstmold.com/injection-molding-service/
Die Casting Applications
10 years of custom zinc, magnesium and aluminum die casting across industries. Source: First Mold die-casting page, https://firstmold.com/die-casting-service/
New Energy Vehicle Parts
Battery housings, motor housings and structural brackets for EV programs — lightweight aluminum with tight tolerance.
3C & Consumer Electronics
Laptop casings, smartphone frames and digital accessories with thin walls and premium as-cast surfaces.
5G Communication
Heat-dissipating housings and structural components for base stations and networking gear.
Appliances & Lighting
Track light castings, appliance frames and high-end instrument components with excellent thermal performance.
Decorative & Nameplates
Perfume caps, bottle caps, nameplates and decorative items — zinc alloy detail reproduction and plating-ready finish.
Industrial & Instrument
Gears, tool bodies, enclosures and precision instrument components in aluminum and magnesium.
FAQ: Die Casting
Practical answers for casting programs. Source: First Mold die-casting page, https://firstmold.com/die-casting-service/
- ✓What alloys do you cast? Aluminum (A380, ADC12, A356), zinc (Zamak 3/5, ZA-8) and magnesium (AZ91D, AM60B) on dedicated furnaces.
- ✓What machine sizes do you run? Multiple automatic die-casting machines from 58 T up to 800 T, covering small precision parts to large housings.
- ✓How fast are lead times? 25 days for die making, 3 days for sampling after tool completion, and 7 days for mass production once approved.
- ✓What quality level can I expect? Over 98% pass rate in full-scale inspection, with dimensional, porosity and surface checks at every stage.
- ✓How many parts can you produce? Monthly output up to 600,000 pieces with multi-tonnage automatic lines.
- ✓What finishes are available? Anodizing, powder coating, plating, painting and polishing — applied in-house after CNC post-processing.
- ✓Do you do secondary machining? Yes — CNC machining, tapping, drilling, grinding and polishing are all done in-house.
- ✓Can magnesium parts be cast? Yes — dedicated magnesium furnaces and handling for lightweight structural parts.