Sheet Bending: Minimum Radius and Springback
Published on 14 August 2026 by Metal S.r.l.
Two critical parameters: minimum bending radius and springback.
Recommended minimum radius
| Material | Minimum radius |
|---|---|
| Mild steel (S235) | 0.5 – 1.0 × thickness |
| High-strength steel (S355) | 1.0 – 2.0 × thickness |
| Stainless AISI 304 | 1.0 – 2.0 × thickness |
| Stainless AISI 316 | 1.5 – 2.5 × thickness |
| Aluminium 1050 | 0.5 – 1.0 × thickness |
| Aluminium 6060 | 1.0 – 2.0 × thickness |
Springback compensation
- Over-bending (2-5° extra)
- Narrow V-die
- Coining
- Air bending
K factor
| Radius / Thickness | K factor |
|---|---|
| < 0.5 | 0.25 – 0.30 |
| 0.5 – 1.0 | 0.32 – 0.38 |
| 1.0 – 2.0 | 0.38 – 0.45 |
| 2.0 – 4.0 | 0.45 – 0.50 |
| > 4.0 | 0.50 |
Conclusion
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