Minimum Bend Radius Reference Table
Minimum bend radius by material, temper, and thickness per AC 43.13-1B.
| Material | Temper | Up to 0.032" | 0.033–0.064" | 0.065–0.125" | 0.126–0.182" | 0.183–0.258" |
|---|---|---|---|---|---|---|
| 2024 Aluminum | O (annealed) | 0.0–1.0T | 0.0–1.0T | 0.0–1.0T | 0.0–1.0T | 0.0–1.0T |
| 2024 Aluminum | T3 | 1.5–3.0T | 2.0–4.0T | 3.0–5.0T | 4.0–6.0T | 5.0–7.0T |
| 2024 Aluminum | T61 | 2.0–4.0T | 3.0–5.0T | 3.0–5.0T | 4.0–6.0T | 6.0–10.0T |
| 5052 Aluminum | O (annealed) | 0.0T | 0.0T | 0.0–1.0T | 0.0–1.0T | 0.0–1.0T |
| 5052 Aluminum | H32 | 0.0T | 0.0T | 0.5–1.0T | 0.5–1.5T | 0.5–1.5T |
| 5052 Aluminum | H34 | 0.0T | 0.0T | 0.5–1.5T | 1.5–2.5T | 2.0–3.0T |
| 5052 Aluminum | H36 | 0.0–1.0T | 0.5–1.5T | 1.0–2.0T | 1.5–3.0T | 2.0–4.0T |
| 5052 Aluminum | H38 | 0.5–1.5T | 1.0–2.0T | 1.5–3.0T | 2.0–4.0T | 4.0–6.0T |
| 6061 Aluminum | O (annealed) | 0.0T | 0.0–1.0T | 0.0–1.0T | 0.0–1.0T | 0.0–1.0T |
| 6061 Aluminum | T4 | 0.0–1.0T | 0.0–1.0T | 0.5–1.5T | 1.0–2.0T | 2.5–4.0T |
| 6061 Aluminum | T6 | 0.0–1.0T | 0.5–1.5T | 1.0–2.0T | 1.5–3.0T | 3.0–4.0T |
| 7075 Aluminum | O (annealed) | 0.0T | 0.0–1.0T | 0.0–1.0T | 1.0–2.0T | 1.5–3.0T |
| 7075 Aluminum | T6 | 2.0–4.0T | 3.0–5.0T | 4.0–6.0T | 5.0–7.0T | 6.0–10.0T |
Calculate Actual Minimum Radius
Enter a thickness value to calculate the actual minimum radius.
Reference: FAA Advisory Circular 43.13-1B, Chapter 4 — Acceptable Methods, Techniques, and Practices — Aircraft Inspection and Repair. Values are minimums; always consult the applicable aircraft structural repair manual.