Date Code vs Cavity Number Engraving: Traceability Systems
Key Takeaway: Use date code inserts for production date tracking (updates automatically each run) and cavity number engraving for per-cavity traceability in quality investigations. Both are required for automotive PPAP and medical device compliance.
Date Code vs Cavity Number: Quick Comparison
| Feature | Date Code Insert | Cavity Number Engraving |
|---|---|---|
| Mark Type | Changeable (YYMM format) | Permanent (1–999) |
| Update Method | Rotate insert — no mold disassembly | Fixed — never changes |
| Min Pin Diameter | ø5mm (insert pocket) | ø3mm (laser engraving) |
| Compliance | Automotive PPAP, ISO 13485 medical | Automotive PPAP (cavity-specific SPC) |
| Cost Premium | $8–15 per pin | $3–8 per pin |
| Mark Depth | 0.3–0.5mm (raised characters) | 0.05–0.10mm (recessed characters) |
Automotive Traceability Requirements
Automotive OEMs require both date and cavity identification per AIAG PPAP (Production Part Approval Process). The common approach is to combine date code + cavity number on the same ejector pin (requires ø6mm+ diameter) or use separate pins for each marking type.
Medical Device Compliance
Medical device manufacturing under ISO 13485 requires lot traceability. Date code inserts satisfy the lot identification requirement when correlated with production records. Cavity numbers enable per-cavity validation of dimensional critical features.