Designing assembly features for plastic parts
| Type | Deflection | Retention Force | Assembly/Disassembly |
|---|---|---|---|
| Cantilever | 2-5mm | Medium-High | Multiple cycles |
| Annular | 0.5-1.5mm | High | One-time (permanent) |
| Torsion | 5-15 deg | Medium | Multiple cycles |
| U-Shape | 3-8mm | Medium | Multiple cycles (low stress) |
Living hinge: only PP and PE are suitable. Hinge thickness = 0.2-0.3mm. Expected cycles: 1-5 million (PP). Radius at hinge root = 0.25-0.5mm.