Investment casting — also known as lost wax casting or precision casting — excels at producing complex metal parts that would be difficult or impossible to machine directly. For a complete investment casting process overview, start with our process guide. When you're evaluating manufacturing routes for your next project, understanding how investment casting compares to MIM and CNC is the single most important factor in getting the cost, lead time, and quality right.
Key Takeaways
- Investment casting delivers CT4-CT6 tolerances with surface finishes of Ra1.6-6.3μm, ideal for medium-complexity parts
- Compared to MIM, investment casting handles a wider size range and avoids expensive metal powder feedstocks
- Compared to CNC machining, investment casting can reduce total cost by 30%-50% for complex parts at mid-to-high volumes
- The buyer's decision triangle: part geometry complexity → material system → annual volume
Here's the short version: make a wax copy of your part, coat it in ceramic, melt the wax out, pour metal in. What's left? A metal part, no machining required. Investment casting, also referred to as precision casting or lost wax casting, uses a consumable wax pattern to create a ceramic mold.
The investment casting process follows these key steps:
The fundamental advantage of precision casting services is the ability to create complex internal geometries without draft angles or parting lines — something CNC simply cannot achieve.
For procurement engineers, the real challenge isn't whether a part can be made — it's which process delivers the best value. Understanding investment casting material capabilities and specifications helps narrow down your options quickly.
| Factor | Investment Casting | MIM (Metal Injection Molding) | CNC Machining |
|---|---|---|---|
| Compatible Materials | Stainless steel, carbon steel, alloy steel, titanium, nickel alloys, cobalt alloys, copper alloys | Stainless steel, low-alloy steel, titanium, tungsten, cobalt alloys | Almost all metals |
| Material Form | Ingot / bar stock | Fine metal powder + binder | Bar / plate / block stock |
| Material Utilization | 70%-90% (near-net) | 95%+ (near-net) | 20%-50% (subtractive) |
| Specialty Materials | Superalloys, wear-resistant alloys | Limited powder systems | Tooling & machinability dependent |
| Factor | Investment Casting | MIM | CNC Machining |
|---|---|---|---|
| Typical Tolerance | CT4-CT6 (±0.1-0.3mm) | IT8-IT11 (±0.05-0.3mm) | IT6-IT8 (±0.005-0.02mm) |
| Surface Finish | Ra1.6-6.3μm | Ra0.8-3.2μm | Ra0.4-1.6μm |
| Tooling Investment | Medium (wax tooling) | High (injection mold) | None |
| Cost-Effective Volume | 500-5,000 pcs/year | 10,000+ pcs/year | Under 500 pcs/year |
If your part requires ±0.1mm tolerance, investment casting can deliver it as-cast — no secondary machining needed. Per ISO 8062 casting tolerance standards (ISO official), CT4-CT6 is the typical range for precision castings.
| Volume Range | Best Process Fit | Rationale |
|---|---|---|
| < 500 pcs/year | CNC Machining | No tooling cost, quick turnaround |
| 500 - 10,000 pcs/year | Investment Casting | Best cost balance at medium volume |
| > 10,000 pcs/year (small & complex) | MIM | High repeatability for tiny features |
| > 10,000 pcs/year (medium & large) | Investment Casting | Better size flexibility |
Want to see how your part compares across all three processes? Get a free process evaluation →
Investment casting is the process of choice across these key sectors:
1. Medical Devices & Surgical Instruments Endoscopic tools, scalpel handles, bone screws, dental implants. These parts demand biocompatible materials (316L, Ti-6Al-4V) and complex geometries — both hallmarks of precision casting.
2. Aerospace & Defense Turbine blades, structural brackets, nozzles made from nickel-based superalloys like Inconel 718. The ability to cast high-temperature alloys is a core strength of lost wax casting.
3. Automotive & Heavy Machinery Turbocharger components, exhaust manifolds, steering knuckles. These parts operate under high temperature and stress, requiring the mechanical integrity of cast alloys.
4. Hardware, Tools & Locks Lock components, tool handles, valve fittings. Investment casting delivers near-net shapes that need minimal post-processing. Browse investment casting product gallery and case studies for real-world examples.
Yujiaxin Tech — founded in 1998 — brings nearly three decades of expertise in precision metal forming.
Ready to compare processes for your next project? Contact our engineering team →
Investment casting sits right in a goldilocks zone of metal manufacturing: it handles medium-complexity parts better than CNC, at lower volumes and material cost than MIM.
The winning selection criteria are clear:
Whether you choose investment casting, MIM, or CNC, Yujiaxin Tech delivers end-to-end service — from drawing review to mass production. Start your free technical assessment → for a process comparison and quote tailored to your project.
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