Standard press brake tooling covers straight bends in common materials. Everything else — hinge curls, louvres, offsets, unusual radii, tight pitch gang tooling — has to be built to order. Ordering custom tooling well is a discipline of its own, and most of the cost overruns in tooling come not from the machining but from a drawing that was signed off before the geometry was fully thought through.
This guide covers the specification sequence for custom press brake tooling, from the drawing you send to the acceptance check you run when it arrives.
Step 1 — Send a drawing a toolmaker can build from
A clear tooling drawing removes most of the back-and-forth and the risk of a tool being remade at your cost. These are the elements that need to be on it:
| Element | Why it is needed | Common omission |
|---|---|---|
| Finished profile with radii and included angle | Defines the punch nose and die opening | Angle given without a tolerance |
| Material and thickness to be formed | Sets tonnage, hardness and die clearance | Only the current material listed, no future range |
| Inside radius required on the part | Determines whether the nose is radiused or sharp | Left to the toolmaker to guess |
| Total tool length and segmentation pattern | Determines stock length, weight and handling | Length stated without segment breakdown |
| Shank / interface profile | The single most common cause of a remake | Machine model given but not the clamping system |
| Required hardness and heat treatment | Controls life and chipping resistance | Hardness left unspecified |
| Surface treatment, if any | Affects galling and wear on stainless and aluminium | Not considered until wear appears |
| Marking and identification | Needed for storage and re-ordering | No part number on the tool |
The interface specification deserves emphasis. Tooling is machine-interface specific: European-style self-seating clamping, American-style and Amada-style systems use different shank profiles and clamping methods. Stating the machine model alone is not sufficient — state the holder and clamping system.
Step 2 — Fix the material and heat treatment
Most production press brake tooling is made from 42CrMo alloy steel, chosen for the balance of toughness and hardenability it offers at the section thicknesses punches and dies require. The heat treatment specification is what determines whether the tool survives:
- Mild and cold-rolled steel: a lower working hardness is usually preferable — it resists edge chipping better than a harder tool in soft material.
- Stainless and high-tensile sheet: higher hardness, and often a surface treatment such as nitriding or a wear-resistant coating, to slow edge wear.
- Aluminium: polished and uncoated surfaces generally perform better, because aluminium tends to gall on coated tooling.
A working hardness in the region of 45–52 HRC covers most applications, adjusted by material as above. Ask for the hardness figure and the heat treatment process to be stated on the quotation and on the tool’s certification — a supplier who cannot state them is very often reselling rather than manufacturing.
Why the hardness number matters commercially
An over-hard punch in a thin-material application is the classic cause of tip cracking: the tool is brittle where it needed to be tough. The failure appears within weeks, and its cost is not the tool — it is the unplanned downtime in the middle of a production run.
Step 3 — Decide the interface and segmentation
Two decisions here affect daily productivity more than the tooling geometry itself.
Quick clamping or conventional clamping. Quick-clamping systems cost more up front and repay it on every job change. If your batch sizes are falling, this is where the setup time is hiding.
Segmented or solid. Segmented tooling — typically supplied in a set of standard lengths — lets you build the exact tool length a part needs, avoids tool collisions on complex profiles, and lets you replace a damaged segment rather than a whole tool. For shops running varied work, a full segmented set is almost always the better investment than one long solid punch.
Our press brake punch and die tooling is supplied segmented and built to drawing, and our hinge curling punch and die is a worked example of how a speciality forming geometry is specified and delivered.
Step 4 — Agree the acceptance check before delivery
Tooling that passes a dimensional check can still fail in production. Agree in advance what will be verified:
- Dimensional inspection of the profile, length, angle and shank against the drawing, with the measurement report supplied.
- Hardness verification against the specified figure, with the heat treatment record.
- Fit check in the actual machine holder — not a generic holder of the same style.
- Try-out on the real material and thickness, checking bend angle consistency across the full tool length, not just at the centre.
- Full-length test — a bend run at both ends and the middle of the tool. This is what exposes ram deflection and crowning problems that a centre-only test hides.
Step 5 — Plan maintenance and re-grinding from day one
Tooling is a consumable with a long but finite life. What determines it in practice:
- Correct tonnage settings. Running above the tool’s rated load is the fastest route to cracking.
- Correct die selection. A narrower V-opening than the material needs raises load and wear on both punch and die.
- Storage. Tooling stored loose gets nicked edges. Racks with the segments protected are not optional in a working shop.
- Re-grinding. Punches can be re-ground, but each pass reduces the nose height and changes the closed height. Record the reduction and re-set the machine accordingly.
| Symptom | Usual cause | Corrective action |
|---|---|---|
| Punch tip cracking | Excessive hardness in a thin-material application, or tonnage far above requirement | Reduce specified hardness, review tonnage settings |
| Bend angle varies along the tool | Ram deflection or crowning not set for the tool length | Check crowning compensation and machine level |
| Galling on stainless parts | Uncoated tooling in a high-pressure contact area | Specify a coating or use a polished surface, review lubrication |
| Edge wear appearing early | Heat treatment below specification, or material harder than the tool was sized for | Verify hardness record, re-specify for the hardest material run |
| Tool will not seat correctly | Shank profile mismatched to the holder | Confirm the clamping system at order stage, not after delivery |
Buying checklist
- Finished profile drawing with dimensions and tolerances, including angle.
- Material and thickness range, including what you expect to run in future.
- Required inside radius.
- Tool length and segmentation pattern.
- Machine holder and clamping system, stated explicitly.
- Hardness specification and heat treatment process.
- Surface treatment, if the material requires it.
- Inspection report and hardness record to be supplied with delivery.
- Re-grinding allowances and the effect on closed height.
FAQ
How long does custom press brake tooling take to make?
Lead time depends on geometry and quantity, and it is normally quoted in working days from drawing approval — which is why the drawing freeze is the date that matters. Get the geometry right before you sign it off.
Can I use standard tooling and modify it instead?
Sometimes, for minor radius changes. For speciality forming — curls, louvres, offsets — modifying standard tooling generally costs more than ordering it correctly the first time, and it voids any performance claim.
What hardness should I ask for?
Typically in the region of 45–52 HRC, adjusted for the material being formed. The important thing is that the figure is stated and certified, not that it is high.
WILAMAC manufactures custom press brake tooling to drawing, including segmented punch and die sets, hinge curling tools and louvre forming tooling, in 42CrMo steel with controlled heat treatment. Send us your part drawing and machine details, and we will confirm the tooling specification and the interface before quoting.
