Premium Punches and Dies for Ironworker Machines (Factory Direct)
NANJING ALAS manufactures a complete lineup of heavy-duty punches and dies for ironworker equipment, engineered to withstand continuous high-tonnage metal fabrication. Crafted from premium-grade shock-resistant tool steels (including DC53, D2, M2, and S7), our replacement tooling delivers exceptional edge retention, low risk of chipping, and excellent wear life under repetitive high-impact operations.
As a dedicated industrial tooling factory, we specialize in high-precision cross-brand compatibility. Our ironworker punch and die sets are machined to strict OEM tolerances, serving as direct, trouble-free replacements for industry-leading brands such as Edwards, Piranha, Scotchman, Geka, Mubea, Kingsland, Baileigh, and METALpro. Whether you need standard round punching stations or customized elongated, square, or hexagon profiles, ALAS ensures a flawless fit for machine capacities ranging from 25 to 150 tons.
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View our complete Ironworker Tooling & Die category for comprehensive fabrication solutions.
1. Product Overview
High-precision custom punches and dies for all hydraulic ironworker machines
Available materials: D2/SKD11/Cr12MoV, M2/SKH51, S7, H13/SKD61, 9CrSi, DC53, 6CrW2Si
Fully compatible with mainstream brands: Edwards, Piranha, Scotchman, Mubea, Geka, Kingsland, Peddinghaus, UniPunch, Baileigh, METALpro
Suitable for flat bar, angle iron, channel, I-beam, sheet metal, tubing, pipe and plate steel (3/16″ – 1″ / 4.76mm – 25.4mm)
Diverse punch shapes: Round, square, oblong, hexagon, oval, metric, offset, corner turning, picket, trimming
Custom sizes supported, with 1/64″ (0.4mm) incremental adjustment and full metric sizing options
Efficient delivery: In-stock products ship within 24-48 hours, custom orders completed in 3-5 days
Factory direct supply, no middleman markup with competitive pricing
2. Tool Steel Material Selection
Professional material selection for different punching scenarios to ensure optimal tool life and working performance.
| Steel Grade | Common Names | Key Characteristics | Best Application |
| D2 / SKD11 / Cr12MoV | High-carbon high-chromium tool steel | Excellent wear resistance, high compressive strength and stable shape retention | Long-run punching for carbon steel (Q235, A36) and thin steel plates |
| M2 / SKH51 / W6Mo5Cr4V2 | High-speed steel | Superior toughness, good red hardness and strong impact resistance | High-speed continuous punching of stainless steel and high-hardness materials |
| S7 | Shock-resistant tool steel | Extreme impact toughness, effectively prevents chipping and cracking | Punching thick plates, hard alloys and complex-shaped workpieces |
| 6CrW2Si | Low-alloy shock steel | Moderate impact toughness with high cost performance | Conventional punching for medium and thin structural steel |
| H13 / SKD61 | Hot-work die steel | Outstanding overall toughness, avoids fracture under heavy impact | Punching ultra-thick and low-hardness plates requiring high impact resistance |
| 9CrSi | General low-alloy tool steel | Reliable wear resistance and economical cost | General-purpose punching for low and medium production volume |
| DC53 | Optimized D2 variant steel | Better edge retention and toughness than D2 steel | Heavy-duty punching for stainless steel and abrasive materials under high impact |
3. Standard Heat Treatment Hardness (HRC)
Standardized Rockwell C hardness treatment ensures stable tool performance and extended service life.
Punch Hardness by Material
| Material | Recommended HRC | Performance Feature |
| D2 / Cr12MoV | 58 – 61 | Balanced wear resistance and anti-chipping performance |
| M2 / SKH51 | 60 – 63 | High hardness for excellent wear resistance and cutting performance |
| S7 | 56 – 58 | Optimized hardness for maximum impact toughness |
| 6CrW2Si | 57 – 59 | Balanced toughness and cost for conventional structural steel processing |
| H13 / SKD61 | 50 – 54 | Prioritizes extreme toughness for heavy-impact working conditions |
| 9CrSi | 58 – 60 | Stable general-purpose hardness for daily punching work |
| DC53 | 60 – 62 | Higher hardness and improved toughness compared with D2 steel |
Die Standard Hardness
| Component | Recommended HRC | Specification |
| General Die | 56 – 60 | 1-2 HRC lower than matching punch to avoid cracking, ensuring compression and friction resistance |
4. Complete Technical Specifications
| Parameter | Specification Details |
| Available Tool Steels | D2/SKD11/Cr12MoV, M2/SKH51, S7, 6CrW2Si, H13/SKD61, 9CrSi, DC53 |
| Punch Hardness | Matched with different materials (refer to Section 3) |
| Die Hardness | HRC 56 – 60 (1-2 HRC lower than supporting punch) |
| Standard Die Clearance | 1/32″ (0.8mm), 1/16″ (1.6mm); maximum optional 1/8″ (3.2mm) |
| Punch Shapes | Round, square, oblong, hexagon, oval, metric, offset, corner turning |
| Max Processing Plate Thickness | 1″ (25.4mm) mild steel |
| Hole Diameter Range | Round hole: 1/8″ – 1-1/2″ (3.2mm – 38.1mm); Square hole: up to 1″ (25.4mm) |
| Surface Treatment | Precision ground finish + anti-rust oil coating |
| Applicable Machines | Edwards, Piranha, Scotchman, Mubea, Geka, Kingsland, Peddinghaus, UniPunch, Baileigh, METALpro |
5. Tool Steel Selection Guide
Step 1: Select by Workpiece Material
Carbon steel (Q235, A36, mild steel): D2/SKD11 for standard use, 9CrSi/6CrW2Si for budget projects
Stainless steel: M2/SKH51 for high-speed work, DC53 for long-term wear resistance
Thick plate (>1/2″ / 12.7mm) & structural steel: S7 for strong impact resistance
Ultra-thick soft plate: H13 for ultimate toughness protection
Step 2: Select by Production Volume
High-volume continuous production: D2, DC53, M2 (excellent wear resistance)
Low-volume job shop processing: 9CrSi, 6CrW2Si, S7 (cost-effective and anti-breakage)
Step 3: Select by Punch Shape
Step 4: Hardness Matching Rule
The die hardness must be 1-2 HRC lower than the supporting punch. Example: D2 punch (HRC 60) matched with D2 die (HRC 58).
6. Die Clearance Reference Table
| Mild Steel Plate Thickness | Per-Side Recommended Clearance |
| Up to 1/4″ (6mm) | 1/32″ (0.8mm) |
| 1/4″ – 1/2″ (6-12mm) | 1/32″ – 1/16″ (0.8mm – 1.6mm) |
| 1/2″ – 3/4″ (12-19mm) | 1/16″ (1.6mm) |
| 3/4″ – 1″ (19-25mm) | 3/32″ (2.4mm) |
| Over 1″ (25mm+) | 1/8″ (3.2mm) |
Note: Stainless steel requires 25-30% larger clearance; thin aluminum sheets require smaller clearance (approx. 0.5mm).
7. Frequently Asked Questions
1. What materials are ironworker dies and punches made of?
Our standard ironworker punches and dies are manufactured from high-grade tool steel, including 9CrSi, D2, Cr12MoV and DC53, heat-treated to 55–62 HRC for balanced hardness and toughness. For heavy-duty, high-volume continuous punching tasks, M2/SKH51 high-speed steel is applied for superior durability. For hard, abrasive materials such as stainless steel, premium steel grades deliver stable cutting performance and extended tool service life.
2. Are punches and dies compatible with all ironworker brands?
Standard shank-style tooling is compatible with most mainstream ironworker brands, including Edwards, Scotchman, Piranha, Mubea, Geka, Kingsland, Peddinghaus, UniPunch, Baileigh and METALpro. Before ordering, please confirm your machine’s shank size, overall length and rated tonnage. Some custom-shaped tooling is machine-specific and requires personalized customization.
3. Why does the punch keep breaking or chipping?
Punch breakage and chipping are mainly caused by punch-die misalignment, uneven or improper die clearance, mismatched tool material, machine over-tonnage and dull cutting edges. Corresponding solutions: realign tool holders and fixing bolts, adjust die clearance evenly, replace with impact-resistant materials such as DC53 or D2, operate with a higher-tonnage machine or reinforced punch, and resharpen or replace worn tooling in a timely manner. Note that D2 steel is not suitable for plates over 5/8″ (15.9mm) due to high chipping risk; S7 is the preferred option, while 6CrW2Si serves as an economical alternative for low-volume processing.
4. What causes heavy burrs and rough hole edges?
Rough hole edges and excessive burrs result from dull tool cutting edges, oversized die clearance, misaligned punch and die, or incorrect machine stroke. To solve the problem, resharpen tool edges, adjust clearance to standard specifications, and recalibrate tooling alignment.
5. Why do slugs get stuck in the die?
Slug jamming is caused by insufficient die inner taper, overly small die clearance or accumulated metal debris inside the die cavity. Effective fixes include polishing the die inner taper, slightly increasing clearance according to plate thickness, and cleaning the die cavity regularly to remove residual debris.
6. Why does the punch stick to the workpiece?
Punch sticking usually occurs due to weak or broken stripper springs, insufficient die clearance, or metal galling when punching stainless steel and aluminum. Resolve the issue by replacing damaged stripper springs, adjusting clearance to standard values, and applying professional cutting lubricant during operation.
7. What is the service life of punches and dies?
Tool service life varies according to tool material, workpiece material, plate thickness and daily production volume. Scientific maintenance effectively prolongs service life: resharpen dull cutting edges regularly, and replace cracked, deformed or severely worn tooling immediately to avoid processing defects and machine damage.
8. Is lubrication needed for punching operation?
Lubrication is required for most punching scenarios. Professional cutting oil is necessary for processing stainless steel, high-carbon steel and thick plates to reduce friction, tool wear and metal galling. Dry punching is only applicable for thin mild steel sheets.
9. How to install punches and dies correctly?
Follow standard installation procedures to ensure tool stability and processing accuracy: loosen the punch fixing nut and die set screw, insert the punch and align the keyway accurately, fully seat the die and match positioning marks, tighten all fasteners firmly, and test with a slow machine stroke before formal full-power operation.
10. How to calculate required punching tonnage?
The standard calculation formula for mild steel punching: Tonnage = Hole perimeter × Material thickness × 80. Always comply with the machine’s rated tonnage limit specified in the official manual to avoid equipment overload and tool damage.
11. Can I get custom-shaped punches and dies?
Yes, customized tooling services are available. We provide oblong, square, rectangular and various special-profile punches and dies, which can be fully customized to match your machine’s shank specifications and personalized punching requirements.
12. What is the best material for punching stainless steel?
M2 (SKH51) and DC53 are the optimal choices. M2 is ideal for high-speed continuous punching, while DC53 features superior edge retention and longer service life for stainless steel processing.
13. Why are dies softer than matching punches?
Dies bear long-term compression and friction during operation. Keeping die hardness 1-2 HRC lower than the matching punch effectively prevents cracking while maintaining stable wear resistance, reducing overall tool replacement costs.
14. Do you provide H13 thick plate punching tools?
Yes. We supply H13/SKD61 punches and dies, which deliver excellent toughness and are specially designed for ultra-thick plate and heavy-impact punching working conditions.
15. Can you provide hardness inspection certificates?
Yes. Batch hardness test reports and official material certification are available upon request for all finished tools from Nanjing Alas.
16. What clearance is suitable for 1/2″ (12mm) A36 steel plate?
For 1/2″ (12mm) A36 mild steel plate, adopt 1/16″ (1.6mm) total clearance (1/32″ / 0.8mm per side) to achieve clean and smooth punching results.
8. Quality Control & Factory Strength
Material Performance Data
| Material | Punch HRC | Impact Toughness (J/cm²) | Application Scenario |
| D2/SKD11 | 58-61 | 10-12 | High-volume carbon steel processing |
| M2/SKH51 | 60-63 | 18-22 | High-speed stainless steel processing |
| S7 | 56-58 | 35-40 | Thick plate & structural steel processing |
| 6CrW2Si | 57-59 | 28-33 | Cost-effective medium-thickness steel processing |
| H13 | 50-54 | 45+ | Ultra-thick soft plate heavy-duty processing |
| DC53 | 60-62 | 25-30 | Abrasive and high-hardness material processing |
Strict QC Process
100% concentricity inspection (≤0.001″ / 0.025mm TIR)
Full inspection of die inner surface to eliminate burrs
Batch hardness testing with official certification support
Professional anti-rust oil coating for long-term storage and transportation
Factory Information
Nanjing Alas is a professional manufacturer of ironworker punching tools. We support standard and customized punches and dies, providing reliable factory direct supply solutions for global customers. Please contact us for quotation with your machine model, processing material and required hole specifications.
