Engraving Depth vs Pin Strength: Engineering Trade-offs
Key Takeaway: Laser engraving at standard depth (0.05–0.10mm) reduces tip cross-section by less than 5% and has no measurable effect on pin fatigue life. Date code insert pockets reduce cross-section by 15–20% — specify ø5mm minimum.
Impact of Engraving on Pin Strength
| Engraving Type | Depth | Cross-Section Reduction | Fatigue Life Impact |
|---|---|---|---|
| Laser cavity number | 0.05–0.10mm | <5% | Negligible (<1% reduction) |
| Laser custom text | 0.05–0.10mm | 5–8% (wider area) | Negligible for ø5mm+ |
| Date code insert | 1.5–2.0mm pocket | 15–20% | 10–15% reduction → use ø5mm+ |
| Mechanical engraving | 0.15–0.20mm | 8–12% | 5–10% reduction (stress concentration) |
Minimum Pin Diameter by Engraving Type
To maintain adequate tip strength after engraving, observe these minimum diameters based on engineering analysis per ASME fatigue design standards:
- Laser cavity number: ø3mm minimum (single digit), ø4mm (two digit), ø5mm (three digit)
- Date code insert: ø5mm minimum (standard insert), ø6mm recommended
- Custom logo/text: ø4mm minimum (up to 3 characters), ø6mm (up to 6 characters)