What is offset (Z) tooling?
Offset tooling, also called Z tooling or joggle tooling, forms two bends in opposite directions in a single stroke, producing a step in the sheet. The punch carries a staggered profile that pushes one side of the material up and the other down.
What is offset tooling used for?
It is used where a part needs a step or joggle, typically to let two panels overlap flush, to clear a mating component, or to create a stiffening offset in thin sheet.
| Application | Why an offset is used |
|---|---|
| Flush lap joints | Two panels sit level after overlapping |
| Clearance steps | The step clears a mating part or a fastener |
| Stiffening joggles | A small step raises stiffness in thin sheet |
| Roof and cladding details | Overlaps and steps are formed in one stroke |
How is an offset dimensioned?
An offset is defined by the height of the step, the two bend radii and the distance between the two bend lines. All four have to be specified, because the tooling is made to that combination.
- Offset height: the total step between the two faces.
- Bend radii: usually the same for both bends, but not necessarily.
- Bend line spacing: the flat distance between the two bends.
- Material and thickness: determines the minimum offset that can be formed.
What is the minimum offset that can be formed?
The offset cannot be shallower than the material can tolerate, because the two bends are close together and their deformation zones overlap. As a working guide, the offset height is normally at least the material thickness plus the bend radius, and thinner offsets need a purpose-made tool.
Is offset tooling the same as a joggle tool?
Yes, the terms are used interchangeably. Joggle is the more common term in sheet metal trades, and offset or Z tooling in machine tooling catalogues. All three describe a double bend that produces a step.
The Z in the name is the same letter as in the shape of the finished section: the part turns one way, steps across, then turns back, tracing a Z.
Related technical pages
Press brake punches
Standard profiles and where a special offset tool fits in.
Custom tooling
How a special offset profile is specified and made.
Bend sequence and collision
When a stepped part is better formed in two operations.
Sectionalized tooling
Building a tool set to suit an unusual part length.
Next step
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