The V-series black calculator picks the right rotary V-die for your sheet thickness and shows its limits. Rotary dies bend with two rotating rockers instead of fixed shoulders, so they leave no die marks and handle very short flanges — for example a 3 mm flange on 1 mm sheet, where a standard V-die would need about 6 mm.
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Results
LiveRotary die model129 kN/m application force
- Minimum outside flange
- 3.9 mm
- Minimum angle
- 34°
- Shoulder radius
- 1.0 mm
- Minimum punch radius
- 0.8 mm
- Max. outside radius at 34°
- 3.17 mm
- Max. outside radius at 90°
- 4.45 mm
- Tool capacity
- 1,093 kN/m
- Application force
- 129 kN/m
- Total force for bend length
- 129 kN (13.2 T)
Values from the V-series (black) rotary die chart for mild steel. Do not exceed the tool capacity per meter.
How the V-series rotary die chart works
Each rotary die model covers a thickness range. Within that range the chart gives the geometric limits of the die (shortest flange, sharpest angle, smallest punch radius, largest outside radius) and the force needed per meter of bend. The application force must stay below the tool capacity.
- Model 1 – 0.45 to 1.5 mm, 34° minimum angle, flanges from 3 mm.
- Model 2 – 1.9 to 4.0 mm, 42–65° minimum angle.
- Model 3 – 4.75 to 6.35 mm, 65° minimum angle, 22.5 mm minimum flange.
How to use the V-Series Black Calculator
- Select the sheet thickness.
- Optionally enter the bend length to get total force.
- Check the minimum flange and angle against your drawing.
Worked example
1.0 mm sheet, 1,000 mm long. Model 1 die: minimum outside flange 3.9 mm, minimum angle 34°, application force 129 kN/m (capacity 1,093 kN/m) → total force 129 kN (13.2 t).
V-series black rotary die chart
| t (mm) | Model | Shoulder R | Min. flange | Min. angle | Min. punch R | Max. R 34° | Max. R 90° | Capacity (kN/m) | Force (kN/m) |
|---|---|---|---|---|---|---|---|---|---|
| 0.45 | 1 | 1 | 3 | 34° | 1.4 | 3.17 | 4.45 | 1093 | 58 |
| 0.5 | 1 | 1 | 3 | 34° | 1.3 | 3.17 | 4.45 | 1093 | 58 |
| 0.6 | 1 | 1 | 3 | 34° | 1.2 | 3.17 | 4.45 | 1093 | 64 |
| 0.8 | 1 | 1 | 3 | 34° | 1.1 | 3.17 | 4.45 | 1093 | 80 |
| 0.9 | 1 | 1 | 3 | 34° | 1 | 3.17 | 4.45 | 1093 | 106 |
| 1.0 | 1 | 1 | 3.9 | 34° | 0.8 | 3.17 | 4.45 | 1093 | 129 |
| 1.2 | 1 | 1 | 3.9 | 34° | 0.8 | 3.17 | 4.45 | 1093 | 186 |
| 1.5 | 1 | 1 | 4.2 | 34° | 0.8 | 3.17 | 4.45 | 1093 | 289 |
| 1.9 | 2 | 1.3 | 8.5 | 42° | 3 | 5.5 | 9 | 1607 | 225 |
| 2.9 | 2 | 1.3 | 8.8 | 42° | 2.8 | 5.5 | 9 | 1607 | 418 |
| 3.0 | 2 | 1.3 | 9.3 | 42° | 2.5 | 5.5 | 9 | 1607 | 482 |
| 3.2 | 2 | 1.3 | 9.3 | 42° | 2.3 | 5.5 | 9 | 1607 | 643 |
| 3.4 | 2 | 1.3 | 9.3 | 55° | 2.1 | 7.9 | 9 | 1607 | 707 |
| 4.0 | 2 | 6 | 22.5 | 65° | 2 | 11.5 | 12.7 | 1929 | 289 |
| 4.75 | 3 | 6 | 22.5 | 65° | 2.4 | 11.5 | 12.7 | 1929 | 836 |
| 6.35 | 3 | 6 | 22.5 | 65° | 3.2 | 11.5 | 12.7 | 1929 | 900 |
Frequently asked questions
What is a rotary V-die?
A rotary (rocker) die has two hardened rockers that rotate as the sheet bends. The sheet is supported over its whole width instead of sliding over die shoulders, so pre-painted, stainless and aluminum sheet stays mark-free.
Why can rotary dies bend shorter flanges?
The rockers hold the flange as they rotate, so it cannot slip into the die opening. Flanges of about 3–4 × thickness are possible, roughly half of what a fixed V-die allows.
Do rotary dies need more force?
They need force similar to air bending with a narrow V-die. Use the application force per meter in the chart and keep it below the tool capacity.
Reviewed by the HARSLE engineering team · Last updated October 2026. Results are engineering estimates; confirm critical values with your machine and tooling documentation.
Rotary die model—