What is a Z bend?
A Z bend is two bends in opposite directions, producing a section shaped like a Z. It is the hardest common section on a press brake, because the middle flange stands up in the path of the tool during the second bend.
What tooling does a Z bend need?
An offset punch with a matching die for the standard case, or a gooseneck where the offset leg is tall. The relief has to clear the standing flange with room for the bend itself, and the offset has to match the step height in the part.
| Situation | Punch | Die |
|---|---|---|
| Small offset, short leg | Offset punch | Single-V or stepped |
| Tall standing flange | Gooseneck | V with clearance below |
| Heavy stock | Heavy-section offset | Matching heavy die |
| Two Zs on one part | Gooseneck | Check both flange paths |
Why does the second bend collide?
By the time the second bend runs, the first has raised a flange into the space the punch needs. The sweep of the punch has to pass that flange, which is exactly what the offset or gooseneck relief provides. If the relief is too shallow, the punch hits the flange and the operator reaches for tonnage, which is how tooling breaks.
What sequence should a Z bend follow?
Bend the leg that leaves the shorter standing flange second where the part allows, and keep the offset dimension consistent on both bends. Sketch the part at every stage before choosing the relief depth.
- Measure the offset height and the standing flange height.
- Choose the punch relief that clears the taller flange with margin.
- Bend the non-colliding leg first.
- Check the offset dimension on both bends with the first piece.
- Confirm the back gauge positions after the tooling change.
Related technical pages
Offset and Z tooling
Offset punches and dies for Z sections and joggles.
Gooseneck vs straight punch
Relief depth and the load it costs.
Bend sequence
Ordering bends so flanges never collide with the tooling.
U bending
The same-direction section, for contrast.
Next step
Send the Z section with both flange heights and we will confirm the offset punch and die.
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