Hardened H13 and mirror-polished S136 steel tools for high-volume production. Multi-cavity layouts from 2 to 32 cavities. Hot-runner systems for cycle-time reduction. Full SPI texture range. 5–7 week build, 1M+ shot life. From $8,500 for simple single-cavity production tools up to $85,000+ for multi-cavity precision assemblies.
Is the design frozen? A production tool assumes no more changes. Every revision to hardened H13 is expensive (add metal welding costs $2,000-8,000 per change). Before committing, validate geometry with prototype tooling or MJF parts. Most clients run 50-500 prototype-molded parts first.
Do volumes justify it? Break-even vs prototype tooling is around 10,000 shots. Break-even vs MJF is around 3,000-5,000 parts for small parts, 5,000-10,000 for larger. Run the math: (prototype cost + per-part cost × quantity) vs (production cost + per-part cost × quantity).
Do you need production features? Hot-runner savings (30-50% faster cycles), multi-cavity layouts (2× to 8× output per cycle), texture and polish specifications, specific resins (PEEK, LCP, high-filled glass) — all require production-grade tooling.
If you need 10,000-50,000 shots but aren't ready for full production commitment, bridge tooling in aluminum 7075 is a middle path — $4,200-12,000 cost, 3-4 week build, 30-50,000 shot life.
| Steel | Hardness | Best for | Cost factor |
|---|---|---|---|
| P20 (pre-hardened) | 32 HRC | Prototype tools; low-volume production of soft resins (PE, PP, ABS) under 50K shots | 1.0× |
| H13 (hardened) | 52 HRC | Standard production tool — 1M+ shots, most resins including glass-filled | 1.4× |
| S136 (hardened, polishable) | 52 HRC | Optical-grade clear parts, cosmetic A-surface, mirror polish | 1.8× |
| SKD11 / D2 | 58 HRC | Highly-abrasive resins (PA66-GF50, LCP, some composites) | 1.6× |
| NAK80 (pre-hardened, polishable) | 40 HRC | Sub-critical cavity inserts for small runs with cosmetic requirements | 1.3× |
| Beryllium copper | 40 HRC | Localized heat management — cooling inserts for hotspots | 3.0× |
More cavities = more parts per cycle = lower per-part cost. But tooling cost scales too. Quick framework:
| Annual volume | Recommended cavity count | Typical reasoning |
|---|---|---|
| < 50,000 | 1 | Tool cost dominates; cycle-time gains don't matter |
| 50,000 - 250,000 | 2 or 4 | Modest multi-cavity lift, doubles tool cost but halves cycle |
| 250,000 - 1,000,000 | 4 or 8 | Serious multi-cavity; hot runner paying off; balanced cooling critical |
| 1,000,000 - 5,000,000 | 8 to 16 | Dedicated production tool with flow simulation; family tool rarely justified |
| > 5,000,000 | 16 to 32 | Stack molds, tandem tools, or multiple duplicate tools running in parallel |
Double the cavity count adds approximately 60% to tool cost (not 100%), but almost exactly doubles parts-per-hour output. For high-volume parts, multi-cavity tools have short payback.
Cooling channels follow part geometry instead of straight-drilled — reduces cycle time 15-30% and minimizes warp. Standard on H13 production tools for cycle-critical applications.
Eliminates runner regrind, reduces cycle time, improves cosmetics. Standard valve-gate systems for production tools above 2 cavities. Hot runner adds $3,000-12,000 per gate but saves money beyond 100K shots.
SPI A-series (A1: mirror, A2: high polish, A3: high polish). SPI B-series (general cosmetic). SPI C-series (matte). SPI D-series (textured, VDI-graded). Specified at tool design, not after.
For families of similar parts, interchangeable cavity inserts reduce changeover time from hours to minutes. Popular for packaging and consumer products with SKU variations.
Cavity pressure sensors, mold temperature monitors, and cycle counters pre-installed. Data flows to production control systems. Standard for medical and automotive tools.
Every production tool above $15,000 includes Moldflow simulation: fill time, cooling profile, weld-line prediction, shrink/warp analysis. Problems caught in CAD are free; problems caught after steel is cut are expensive.
Production tool cost depends heavily on cavity count, part complexity, and mechanism requirements. Rough guide for H13 tools:
| Part + tool complexity | Single cavity | 4-cavity | 8-cavity |
|---|---|---|---|
| Simple part, straight pull | $8,500-12,000 | $18,000-28,000 | $32,000-48,000 |
| Moderate, 1-2 slides | $12,000-18,000 | $28,000-40,000 | $48,000-65,000 |
| Complex, multiple actions | $18,000-35,000 | $40,000-60,000 | $65,000-90,000 |
| Multi-material / 2-shot | $25,000-50,000 | $55,000-85,000 | Quote |
Per-part molding costs on production tools typically run:
Cost is primarily resin cost + cycle time + allocated machine rate. For glass-filled, flame-retardant, or specialty resins, add 20-100% to resin cost.
Every production tool includes:
For ISO 13485 (medical) or IATF 16949 (automotive) tools, additional documentation includes process validation (IQ/OQ/PQ), PPAP packages, and full material traceability.
Send us your STEP file and target volume — we quote the right tool steel, cavity count, and runner system for your annual demand. Moldflow included on tools above $15K.
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