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Made from 42CrMo alloy steel
Treated with strict hardening process
Hardness: HRC 47–52
Can be sharpened many times without losing hardness
Saves money and lasts much longer
Precision ground to ±0.01mm tolerance
Sectional (segmented) tooling lets you mix lengths quickly
No need to cut tools or wait for custom parts
Great for complex, multi-step bending jobs
Amada / Promecam (European Style): Most common universal fit
Trumpf / Wila (New Standard): Fast hydraulic clamping
American Style: Traditional tang & set-screw mounting
Mounted on the moving part of the brake
Applies pressure
Shape decides the outside form of the bent part
Fixed on the worktable
Usually has a V-shaped groove
V-width affects bending force, radius, and quality
Put sheet metal on the lower die
Upper die presses down
Sheet bends into shape permanently
Upper die moves back
Remove finished part
Strong & wear-resistant: Made of hardened alloy steel to handle high pressure
Customizable: Can make special shapes (radius, gooseneck, special V-grooves)
Fits your machine: Matches clamping, stroke, and tonnage
Standard & ready to use: Works with Amada, Trumpf, Wila, etc.
Standard straight molds: For general bending
Sharp-angle molds: For small angles & springback control
Gooseneck molds: For U-shaped & deep parts (avoids interference)
Arc molds: For rounded bends
Special irregular molds: For custom parts
Standard tooling: For mild steel, galvanized steel
High-strength tooling: For stainless steel, hard alloys
Thin-sheet tooling: Prevents bending marks and warping
Mild steel: Low springback
Stainless / high-strength steel: High springback — needs angle compensation
Wrong choice = inaccurate angles
Thin sheet: Use 6× thickness
Thick sheet: Use 10–12× thickness
Prevents cracking and tool breakage
Calculate required bending force
Keep a 10–15% safety margin
Use thick or segmented tools for heavy bending
Standard punch: General bending
Sharp-angle: Small angles
Gooseneck: Deep boxes
Arc / custom: Special shapes
Check shank / clamping type
Check tool height matches machine stroke
Wrong fit = installation failure
Do not ignore springback — angles will be wrong
Do not break the 8x rule — parts crack, tools break
Do not use mismatched tooling — machine may be damaged
Offset dies
Hemming tools
Special custom tooling based on your drawings
Strong 42CrMo steel, hardened to HRC 47–52
Precision ground for straightness and consistency
Faster setup, no repeated adjustment
Fits Amada, Trumpf, Bystronic, Promecam and more
Direct replacement for original parts
Country/Standard Organization | Standard Code | Corresponding Grade |
China (GB) | GB/T 3077 | 42CrMo or 42CrMo4 |
USA (AISI/ASTM) | ASTM A29 | 4140 |
International Organization for Standardization (ISO) | ISO 683-1 | 42CrMo4 |
Germany (DIN) | DIN EN 10083 | 1.7225 (or 42CrMo4) |
Japan (JIS) | JIS G4105 | SCM440 |
UK (BS) | BS 970 | 708M40 (EN19) |





Our high-precision tooling features a height tolerance of ±0.01mm and overall parallelism within 0.02mm across the full length. When assembling multiple segmented dies, the bending line stays perfectly straight, leaving no step marks on workpieces.
Absolutely. Our V-dies are designed with optimized arc radii to reduce friction and avoid die cracking during high-strength material bending. For stainless steel processing, we adopt precision ground arcs and mirror polished surfaces to effectively prevent workpiece indentation and marking.
Yes. We offer standard and customized Ear Pieces (Horns) in complete specifications, such as 100mm left and right types. They provide sufficient avoidance clearance for side flanges, which are indispensable for four-sided box and tray bending.
Our tooling is produced strictly in accordance with Amada, Wila, Trumpf and other mainstream OEM standards. The positioning tangs and safety clicks are perfectly adapted to manual and automatic hydraulic clamping systems, realizing quick installation and safe operation.
Material Grade
Top quality: 42CrMo alloy steel
Avoid suppliers who cannot state the exact steel grade.
Hardening Performance
Deep induction hardening: HRC 47–52
Hardening depth: 2–4mm minimum
Supports repeated regrinding without losing hardness.
Reject shallow surface nitriding and easy-peel thin coatings.
Precision & Surface Finish
Dimensional tolerance: ±0.01mm
Mirror polish: Ra < 0.4
Low friction, no indentations, no material sticking on sheet metal.
Segmented Interchangeability
Sections from different batches must match height and centerline perfectly.
Mismatch causes obvious step marks on bent workpieces.
Features of High-Quality Tooling
Keeps straight after long use
Wear and crack resistant for stainless steel & high-tensile steel
Perfect fit for standard clamping systems
Leaves no marks or steps on bent parts


Nanjing Alas International Co., Ltd. is a professional industrial tooling manufacturer focused on shear blades, bending dies, shredder blades, and custom wear parts. We offer full application engineering, material selection, setup guidance, and after-sales support to global customers.
Tell us your requirements, and our engineering team will provide professional solutions for blade specification, tool life optimization, and cost-effective production.
