Plastic injection moulding and tooling: MOQ, tooling, lead time and landed cost
Confidence 4/5 Established practice
Injection moulding is the default process for plastic parts at volume, and the moment a buyer commits to a mould it becomes the most expensive decision in the project. The tool is a one-off capital cost that only makes sense against a realistic total volume, so the honest question is never "can it be moulded" but "at how many units does moulding beat machining".
Quick answers
| Minimum order quantity | Generally 1,000 pieces for a simple single-cavity part, 3,000+ where the part is large or has multiple cavities, because the tool cost has to be spread. |
| Lead time | Tool design and build: 20–35 days. First-off sample: 3–7 days after that. Mass production: 15–30 days. |
| Tooling | USD 1,500–5,000 for a small simple single-cavity mould; USD 5,000–20,000 for medium complexity with slides or multiple cavities; above USD 20,000 for large parts, hot runners or family tools. Steel grade, cavity count and finish drive it more than part size alone. |
| Unit cost | Roughly USD 0.05–0.50 for a small part in commodity resin at 50,000+ units. Below about 1,000 units, CNC machining or 3D printing is usually cheaper all-in than building a mould. |
| HS classification | The mould itself is classified under 8480.7x (moulds for rubber or plastics). The finished plastic part usually falls under chapter 39, with 3926.90 as the residual heading when no specific heading applies. |
| Certification | Resin choice determines compliance: ABS and PP are common and easy, PC and PA need drying, and food-contact or flame-retardant grades require the corresponding documentation. |
| Duty | Moulds and finished parts are classified separately and can attract different rates, so the tool and the production run should be invoiced as distinct line items rather than bundled. |
Common mistakes
- Cutting a mould for a product with unproven demand. Validate the market with machined or printed units first.
- Not naming the steel grade. A 718H or a P20 mould behaves very differently to a soft prototype tool at 100,000 shots.
- Skipping the DFM review. A part designed without draft angles, uniform wall thickness or adequate radii will mould badly or not at all.
- Assuming one cavity. Multi-cavity tools multiply output and cost together, and the right answer depends on annual volume, not on the first order.
- Forgetting that the tool has a finite shot life and needs maintenance.
Detailed answers
Sources
- Injection mould tooling cost and lead-time benchmarks — Industry practice; consistent across published supplier guidance
- Moulds under HS heading 8480 — World Customs Organization HS nomenclature
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