SmCo Incoming Inspection Checklist for OEM Teams
A practical incoming inspection checklist for SmCo programs that reduces lot-to-lot variability and shortens supplier feedback loops.
Incoming inspection is where many SmCo programs either gain stability or lose control. If inspection criteria are generic, each lot may pass with hidden variation that appears later in assembly or field use.
Incoming Control Path (Visual)
What to Lock Before First Shipment
Define these items in writing before supplier dispatch:
- drawing revision and tolerance baseline
- magnetic property acceptance criteria
- test orientation and fixture assumptions
- sampling plan (AQL or fixed sample count)
- non-conformance handling timeline
If this baseline changes, revision control must be explicit.
Core Incoming Checklist
Use this as a minimum acceptance set:
| Area | What to Verify | Typical Evidence |
|---|---|---|
| Documentation | PO, drawing rev, lot ID, COA alignment | Shipment pack + COA |
| Dimensions | Critical dimensions and datums | CMM or gauge records |
| Magnetic Direction | Magnetization orientation vs drawing | Direction verification record |
| Magnetic Consistency | Key magnetic parameters by sample | Test log with method |
| Surface Condition | Chipping, cracks, coating integrity | Visual + microscope notes |
| Packaging | Protection, orientation segregation, labels | Receiving photos |
Do not collapse this into a single "visual pass" decision.
Sampling Strategy by Program Stage
- Prototype: dense sampling to map process spread quickly.
- Pilot: balanced sampling focused on repeatability trends.
- Mass Production: stable plan with escalation triggers.
Sampling strategy should evolve with process maturity, not remain static.
Escalation Triggers You Should Pre-Agree
Predefine actions for:
- out-of-spec critical dimensions
- orientation mismatch
- abnormal magnetic spread vs historical lots
- coating or edge-chipping trends
When triggers are predefined, supplier corrective action starts immediately.
Closure Data for Every NC Case
Require the supplier to return:
- containment action
- root cause hypothesis
- corrective action with due date
- verification method for recurrence prevention
Without recurrence verification, the same issue usually reappears in later lots.
Field Evidence Snapshot
| Control Mode | NC Repeat Rate (first 3 lots) | Average Closure Time |
|---|---|---|
| No fixed NC template | 30%-40% | 10-14 days |
| Fixed NC template + weekly sync | 10%-18% | 3-6 days |
The largest gain usually comes from clear owner + due date discipline, not from additional paperwork.
Incoming Inspection Record Template
Use a standardized lot record so supplier feedback is consistent:
| Field | Example Entry Type |
|---|---|
| PO number / lot ID | Text |
| Drawing revision | Text |
| Sample count checked | Number |
| Critical dimensions status | Pass/Fail + note |
| Magnetic direction status | Pass/Fail + note |
| Magnetic consistency status | Pass/Fail + note |
| Surface condition findings | Defect code + quantity |
| Disposition | Accept / Hold / Reject |
| Owner + due date (if NC) | Name + date |
Without a fixed record structure, NC closure quality tends to vary by person.
Related Internal Guides
- SmCo Supplier Audit Checklist for China OEM Programs
- High-Temperature SmCo Validation Plan
- OEM Qualification and Reliability Validation
- Contact / RFQ
External Standards and References
- ISO 2859-1 sampling standard overview
- ASQ acceptance sampling reference
- ISO 9001 quality management overview
If you want to align incoming criteria with your thermal duty and drawing baseline, contact [email protected], or message WhatsApp.
Author
Application Engineering Specialist & Founder at SmCoSupply. Expert in high-temperature samarium cobalt magnet applications and OEM production scaling.
- Reviewed against real RFQ and sample handoff workflows.
- Updated when buyer-side acceptance criteria materially change.
- Intended for engineering and procurement decision support.
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