Magnesium Die Casting
Lightweight applications requiring high strength-to-weight ratio.
Review Magnesium Projects →Die Casting Knowledge Hub
Die Casting Guide: Processes, Materials, Tooling & Cost Factors
A practical engineering guide covering aluminum, zinc and magnesium die casting, tooling, defects, tolerances and design considerations for OEM parts.
Mold ToolingCast PartsCNC FinishingOEM Inspection
Direct Answer
What is Die Casting?
Die casting is a metal manufacturing process where molten alloy is injected into a steel mold under high pressure to create complex components with high repeatability, dimensional consistency and production efficiency. It is widely used for aluminum, zinc and magnesium OEM parts that require stable production volume, thin walls, strong geometry control and secondary machining or finishing.
Process Selector
Which Die Casting Process Should You Choose?
Select a die casting process based on alloy, component size, geometry, production volume and tooling requirements.
Need lightweight structural parts?
Aluminum Die Casting
For housings, heat sinks, brackets and structural OEM parts.
Need small precision components?
Zinc Die Casting
For connectors, small housings and thin-wall precision parts.
Need maximum weight reduction?
Magnesium Die Casting
For lightweight automotive and electronics applications.
Need complex production requirements?
Engineering Review
For process selection, tooling feasibility and cost review.
Need help selecting the right process? Request Engineering RFQ Review →
Casting Processes
Die Casting Processes Explained
Different die casting methods solve different alloy, volume, porosity and tooling requirements.
Cold Chamber Die Casting
Best for aluminum and magnesium alloys requiring high-pressure metal injection.
- Aluminum
- Magnesium
Hot Chamber Die Casting
Best for zinc and high-cycle production of small precision components.
- Zinc
- High cycle production
Semi-Solid Metal Casting
Useful when lower porosity and improved mechanical properties are required.
- Lower porosity
- Improved properties
Vacuum Die Casting
Helps reduce gas porosity for parts with sealing, strength or appearance requirements.
- Reduced gas porosity
- Improved consistency
Gravity Casting
Useful for lower tooling investment and lower-volume casting requirements.
- Low tooling investment
- Lower volume parts
Material Selection
Die Casting Materials Guide
Material choice affects weight, strength, corrosion resistance, tooling strategy, machining and surface finishing.
Aluminum Die Casting
Alloys: A380, ADC12 and A356.
LightweightStrengthCorrosion Resistance
Applications: housings, heat sinks and structural parts.
Aluminum Die Casting →
Zinc Die Casting
Excellent detail, thin wall capability and dimensional stability.
PlatingPaintingFine Detail
Applications: connectors, small housings and mechanical components.
Zinc Die Casting →
Magnesium Die Casting
Ultra lightweight alloy option with high strength-to-weight ratio.
Weight ReductionAutomotiveElectronics
Applications: electronics and automotive structural components.
Tooling Guide
Die Casting Tooling Explained
Tooling design controls metal flow, porosity, cycle time, tool life and production consistency.
Mold Design
Cavity, core and slide design define geometry feasibility, part release and production repeatability.
Gate Design
Gate location and size influence metal flow, filling behavior, weld lines and porosity risk.
Cooling Channels
Cooling channel layout affects cycle time, dimensional stability, heat balance and tool life.
Tool Life
Production volume, alloy selection, maintenance planning and thermal cycling determine tooling durability.
Die Casting Tooling →Defect Control
Common Die Casting Defects and Solutions
Defect prevention starts with DFM review, tooling design, process control and inspection planning.
Porosity
Cause: Trapped gas.
Solution: Vacuum casting and optimized venting.
Flash
Cause: Parting line issue.
Solution: Mold maintenance and clamping control.
Cold Shut
Cause: Poor metal flow.
Solution: Gate optimization and temperature control.
Shrinkage
Cause: Solidification issue.
Solution: Process control and geometry review.
Tolerance Control
Die Casting Tolerances Explained
Die casting tolerances depend on alloy, mold design, feature size, part geometry and secondary CNC machining requirements.
| Tolerance Level | Typical Range | Use Case | Engineering Note |
|---|---|---|---|
| Standard Casting | ±0.2 mm | General cast features | Suitable for many as-cast dimensions. |
| Precision Features | Drawing Based | Mating areas and functional surfaces | Requires tooling review and inspection planning. |
| Machined Features | CNC Controlled Tolerance | Holes, threads, bores and sealing faces | Controlled by CNC post-machining. |
| Dimension | Die Casting | CNC Machining |
|---|---|---|
| Best Strength | High-volume near-net-shape parts | Precision features and tight tolerances |
| Tolerance Control | Good for as-cast geometry | Best for critical dimensions |
| Typical Use | Housings and structural forms | Bores, threads and sealing faces |
Design Guidelines
Die Casting Design Guidelines
Good die casting design reduces tooling complexity, defects, machining time and production cost.
Wall Thickness
Avoid uneven thickness. Use uniform wall sections to improve filling, reduce shrinkage and support stable casting quality.
Draft Angle
Avoid zero-draft surfaces. Add proper draft to support clean ejection and reduce tooling wear during production.
Corners
Avoid sharp corners where possible. Add radius transitions to improve metal flow and reduce local stress concentration.
Undercuts
Avoid complex slides when the function allows. Optimize tooling access to reduce mold complexity and maintenance cost.
Cost Factors
What Affects Die Casting Cost?
Die casting cost is driven by tooling investment, alloy choice, production volume and secondary operations.
Tooling Cost
Problem: Complex molds and slides increase investment.
Optimization: Review geometry before tooling.
Material
Problem: Alloy cost and casting behavior vary.
Optimization: Select alloy by function and volume.
Production Volume
Problem: Tooling cost must be amortized.
Optimization: Match tooling strategy to demand.
Machining
Problem: Critical features may need CNC finishing.
Optimization: Machine only functional areas.
Surface Finishing
Problem: Finishes add preparation and handling.
Optimization: Define appearance and protection early.
Process Comparison
Die Casting vs CNC Machining: Which Process Should You Choose?
Use volume, tooling investment, geometry and tolerance requirements to select the right route.
| Dimension | Die Casting | CNC Machining |
|---|---|---|
| Volume | Best for medium to high volume | Best for prototype to low-medium volume |
| Tooling | Steel die required | No hard tooling required |
| Material | Aluminum, zinc and magnesium alloys | Metals and plastics |
| Geometry | Complex thin-wall housings | Machined features and tight tolerance geometry |
| Cost | Efficient after tooling investment | Efficient for lower volume and precision control |
FSD Difference
Die Casting with CNC Post-Machining
Many OEM die cast parts require CNC machining, surface finishing and inspection before final delivery.
As Cast PartCNC MachiningSurface FinishingInspectionFinal Delivery
Quality Control
Die Casting Quality Inspection
Quality control verifies cast geometry, machined features, material traceability and production readiness.
CMM Inspection
Dimensional verification for critical machined and cast features.
X-Ray Inspection
Internal defect review for porosity-sensitive components.
Leak Testing
Functional verification for housings, channels and sealed parts.
Material Certificate
Alloy traceability and production documentation.
Quality Control →Project Examples
Die Casting Project Examples
Typical die casting projects combine alloy selection, tooling, secondary machining, finishing and inspection.
Aluminum Housing
Process: Die Casting + CNC + Anodizing
Motor Housing
Process: Aluminum Die Casting
Connector Components
Process: Zinc Die Casting + Plating
FAQ
Die Casting Guide FAQ
What is die casting?
Die casting is a high-pressure metal manufacturing process used to produce complex aluminum, zinc and magnesium OEM components with repeatable dimensional consistency.
What metals are used for die casting?
Common metals include aluminum alloys such as A380 and ADC12, zinc alloys for small precision parts and magnesium alloys for lightweight applications.
What is aluminum die casting?
Aluminum die casting is used for lightweight housings, heat sinks, brackets and structural parts requiring scalable production. Explore Aluminum Die Casting.
What is zinc die casting?
Zinc die casting supports small precision components with fine detail, thin walls and stable dimensions. Explore Zinc Die Casting.
Cold chamber vs hot chamber die casting?
Cold chamber die casting is typically used for aluminum and magnesium, while hot chamber die casting is commonly used for zinc and high-cycle small component production.
How much does die casting cost?
Cost depends on tooling, material, production volume, machining, surface finishing and inspection requirements.
What defects occur in die casting?
Typical defects include porosity, flash, cold shut and shrinkage. DFM review and process control help reduce these risks.
Can die cast parts be CNC machined?
Yes. CNC post-machining is used for critical holes, bores, threads, sealing surfaces and tolerance-controlled features. Die Casting + CNC Post-Machining.
What tolerances can die casting achieve?
Standard casting features may be around ±0.2 mm, while machined features can be controlled through CNC post-machining based on drawings.
How long does die casting tooling take?
Tooling timing depends on mold complexity, cavity design, slides, cooling channels and validation needs.
RFQ Support
Need Die Casting Support?
Upload CAD files, material requirements, quantity and finish requirements. FSD engineers review die casting feasibility, tooling strategy, machining requirements and production risk before quotation.