Obsolete and discontinued industrial parts: MOQ, tooling, lead time and landed cost
Confidence 4/5 Established practice
The Chinese industrial aftermarket is deep, poorly indexed outside China, and frequently the only remaining source for a part an OEM stopped making years ago. Sourcing it is a research problem rather than a manufacturing one, and the correct answer is not always a new part — sometimes it is identifying the original contract manufacturer, and sometimes it is honestly reverse-engineering the thing.
Quick answers
| Minimum order quantity | One piece. A single replacement part to restart a production line is a legitimate order and is quoted as one. |
| Lead time | Identification and sourcing: 3–15 days, and genuinely unpredictable for obscure parts. If reverse engineering is needed, add 10–20 days for drawing and a sample. |
| Tooling | None, unless the part no longer exists anywhere and has to be made. Then it follows whichever process fits — machining for one-off, casting or moulding for volume. |
| Unit cost | Wildly variable, because it spans a USD 5 bearing and a USD 4,000 discontinued control board. The honest answer is that this category cannot be estimated without the part number, the machine make and model, and a photograph. |
| HS classification | Depends on the part and the machine it belongs to: 8483 for gearing and bearings, 8537 for control panels, 8543 for electrical machines with individual functions, 8466 for machine tool parts. Identification precedes classification. |
| Certification | For safety-relevant parts, material and test certificates are the acceptance evidence, and undocumented equivalents should not be used. This is worth stating plainly rather than quietly sourcing something close. |
| Duty | Industrial parts often carry low or zero duty, but machinery parts have been caught by Section 232 derivative tariff extensions in the US. Verify rather than assume. |
Common mistakes
- Supplying a part number without the machine make and model; the same number exists across manufacturers.
- Accepting an "equivalent" for a safety-critical application without documented equivalence.
- Not asking whether the source is the original manufacturer, a licensed maker or an aftermarket copy — all three exist and differ in price and risk.
- Ordering one unit of a part whose failure mode is fatigue, then having it fail again.
- Reverse-engineering without verifying the material, only the geometry.
Detailed answers
Sources
- Industrial aftermarket sourcing practice — Industry practice; part availability varies by category
- Machinery and mechanical appliance classification — World Customs Organization HS nomenclature
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