Injection mold cost ranges from $2,000 for a simple single-cavity mold to over $100,000 for a complex multi-cavity hot-runner system. Understanding what drives these numbers helps you budget accurately and avoid unnecessary costs. Here is exactly what you are paying for.
The Six Cost Drivers
1. Steel Grade (15-25% of total cost)
Steel is the single largest material cost. The grade depends on your production volume and material:
- P20 (28-32 HRC) — $200-400 for a typical mold base. General purpose, low volume. Good for PP, PE, ABS.
- 718H (33-37 HRC) — $300-600. Medium production, good polishability. Standard for most commercial molds.
- NAK80 (38-42 HRC) — $400-800. High polish for optical parts, lenses, transparent components.
- S136 (48-52 HRC) — $500-1,000+. Corrosion resistant, required for medical and food-grade. ISO 13485 compliant.
- H13 (46-50 HRC) — $400-800. High-temperature, for engineering resins and die-casting. Glass-filled materials require H13 or harder.
- M333 (50-54 HRC) — $600-1,200. Extreme wear resistance for high-glass-fiber materials and million-shot production.
2. Cavitation (20-40% of total cost)
Number of cavities directly multiplies machining time and complexity:
- Single cavity — Baseline cost. One part per cycle.
- 2-cavity — ~1.5-1.8x single cavity cost.
- 4-cavity — ~2.5-3x single cavity cost.
- 8+ cavity — 4-6x+. Only justified for high-volume production (500K+ parts/year).
For volumes under 100K/year, a 2-cavity or 4-cavity family mold is often the sweet spot. The additional cavitation pays for itself quickly in reduced per-part cost.
3. Part Complexity (15-30% of total cost)
Complexity factors that drive up cost:
- Undercuts — Require side actions, lifters, or collapsible cores. Each side action adds $500-2,000.
- Threads — Unscrewing mechanisms or split cavities add significant cost.
- Tight tolerances — ±0.02mm requires premium EDM and more inspection time.
- Thin walls — Below 0.8mm requires specialized flow analysis and may need hot runner.
- Complex geometry — Deep ribs, multiple bosses, or intricate surface textures add machining hours.
4. Surface Finish (5-15% of total cost)
- SPI B-1 / A-3 (commercial finish) — Included in standard pricing.
- SPI A-2 / diamond polish — Adds $500-3,000 depending on area. Requires NAK80 or S136 steel.
- Texture / engraving — Adds $300-2,000 depending on complexity.
- Mirror finish (optical) — Adds $1,000-5,000+. Requires NAK80 with extended polishing.
5. Runner System (5-20% of total cost)
- Cold runner (2-plate) — Standard, lowest cost. Runner material is scrap.
- Cold runner (3-plate) — Allows automatic degating. ~20% more than 2-plate.
- Hot runner — No runner waste, faster cycles, better for high-volume. Adds $2,000-10,000+. Justified above ~50K parts/year.
- Insulated runner — Middle ground. Less expensive than full hot runner.
6. Mold Base Standard (5-10% of total cost)
HASCO (Europe) and DME (US) premium ranges add 10-20% versus LKM (Asia). MISUMI (Japan) is price-competitive but has longer lead times for custom plates. Confirm the standard in your purchase order.
Example Cost Ranges (2026, Shenzhen)
| Mold Type | Typical Range | Example |
|---|---|---|
| Simple single-cavity (P20, 2-plate cold runner) | $2,000-$5,000 | Simple cap or cover |
| Medium 2-cavity (718H, 2-plate cold runner) | $5,000-$15,000 | Consumer electronics housing |
| Complex 4-cavity hot runner (S136, HASCO) | $20,000-$50,000 | Medical device component |
| Large multi-cavity hot runner (H13, DME) | $50,000-$100,000+ | Automotive interior part |
Get an Accurate Quote for Your Part
Every part is different. The best way to get an accurate price is to submit your CAD file for a free DFM review and quote. Our engineers respond within 24 hours with detailed pricing broken down by steel, cavitation, and complexity. No obligation.
Ready to Start Your Mold Project?
Submit your CAD file for a free DFM review and detailed quote. Our engineers respond within 24 hours. NDA signed before file review.