When choosing a hydraulic hole puncher, start with the required hole diameter and material thickness. Then confirm the material type and strength, compatible punch and die sizes, throat depth, power source, machine weight, punching speed, workload, and availability of replacement tooling.
The largest hole diameter is not the only specification that matters. A machine capable of punching a certain diameter in thin mild steel should not automatically be assumed to punch the same hole through thicker or stronger material.
For repetitive punching near a reliable electrical supply, a corded electric hydraulic hole puncher is often the more practical choice. For mobile installation crews, elevated structures, and remote jobsites, a cordless hydraulic hole puncher can provide greater flexibility.
The best hydraulic hole puncher is therefore the machine that safely matches your hole size, material thickness, material strength, tooling requirements, reach, and working environment.
What Is a Hydraulic Hole Puncher?
A hydraulic hole puncher is a powered metalworking tool that uses hydraulic force to drive a punch through metal into a matching die, creating a hole by shearing rather than conventional drilling.
In a typical electric hydraulic design, an electric motor drives a hydraulic pump. Hydraulic pressure acts on a piston, and the piston pushes the punch through the workpiece into the die.
The basic energy path is:
Electrical Energy → Motor → Hydraulic Pump → Hydraulic Pressure → Piston → Punch → Metal → Die
Portable hydraulic hole punchers are commonly used for steel plates, brackets, structural components, fabrication work, installation, and industrial maintenance where bringing the tool to the workpiece is more practical than moving the workpiece to a stationary punching machine.
POWER ELECTRICAL currently offers corded MHP-20, MHP-25, and MHP-32 hydraulic hole punchers, together with the cordless MHP-20B product line.
How Does a Hydraulic Hole Puncher Work?
A hydraulic hole puncher works by converting electrical power into hydraulic pressure and then into linear punching force.
The motor does not directly force the punch through the steel.
Instead, the process generally works like this:
1. The operator positions the material
The workpiece is placed between the punch and die according to the manufacturer’s instructions.
2. The motor starts
The trigger or switch activates the electric motor.
3. The motor drives the hydraulic pump
The pump moves hydraulic fluid through the enclosed system.
4. Hydraulic pressure acts on the piston
As resistance develops, hydraulic pressure acts over the piston area and generates linear force.
5. The punch moves through the metal
The punch enters the workpiece and shears the material into the matching die.
6. The punch retracts
After the cycle is complete, the piston and punch return so the machine can be repositioned for the next hole.
Pascal’s principle explains the basic physics behind hydraulic force transmission: a change in pressure applied to an enclosed fluid is transmitted through that fluid.
The exact hydraulic circuit, return mechanism, pressure, and punching force depend on the specific machine design.
What Should You Consider When Choosing a Hydraulic Hole Puncher?
The main buying factors are:
Hole diameter → material thickness → material type and strength → punch and die → throat depth → power source → punching speed → weight → workload → serviceability
These specifications should be evaluated together.
Maximum Hole Diameter
Maximum hole diameter tells you the largest hole size a machine is designed to produce under its specified operating conditions.
For example, POWER ELECTRICAL currently publishes:
| Model | Published Maximum Hole Diameter |
|---|---|
| MHP-20 | 20.5 mm |
| MHP-25 | 25.5 mm |
| MHP-32 | 30.5 mm |
The MHP-20 product page also lists punch tooling from 6.5 mm through 20.5 mm, while the MHP-25 lists multiple tooling sizes through 25.5 mm.
These examples demonstrate an important buying principle:
Maximum hole diameter should always be checked together with material thickness and the approved punch-and-die combination.
Do not select a machine solely because its model name includes 20, 25, or 32.
Maximum Material Thickness
Material thickness is just as important as hole diameter.
A 20 mm hole through 4 mm steel is not the same punching requirement as a 20 mm hole through much thicker steel.
The thicker the material, the greater the demand placed on the punch, die, hydraulic system, and machine structure.
As current examples, POWER ELECTRICAL lists:
- MHP-20: maximum thickness 6 mm
- MHP-25: maximum thickness 12 mm
- MHP-32: maximum thickness 15 mm
under the specifications published on the respective product pages.
Those figures should not be interpreted independently from the material type and tooling configuration.
The correct purchasing question is not:
“Can this machine make a 20 mm hole?”
It is:
“Can this machine make the required hole diameter through my material type and thickness using the approved punch and die?”
Material Type and Strength
Material type and strength affect punching capacity because different metals resist shearing differently.
A capacity rating established for mild or carbon steel should not automatically be applied to:
- stainless steel,
- hardened steel,
- high-strength steel,
- aluminum,
- or other metals.
The material may look similar, but its mechanical properties can create a very different punching load.
Therefore, professional buyers should confirm:
Hole Diameter + Thickness + Material Type + Material Strength + Manufacturer Rating
Do not assume that a machine rated for a certain thickness of ordinary steel will provide identical capacity in stainless or higher-strength materials unless the manufacturer specifically approves it.
Punch and Die Size
The punch and die are the core tooling components of a hydraulic hole puncher.
The punch creates the cutting profile.
The die supports the material and provides the opening into which the punch enters.
They must work as a matched system.
Different machines may offer several punch and die sizes. For example, POWER ELECTRICAL currently lists the following mold-hole diameters for the MHP-20:
6.5 mm / 9 mm / 13 mm / 17 mm / 20.5 mm.
For the MHP-25, published sizes include:
11 mm / 13 mm / 17 mm / 21.5 mm / 25.5 mm.
A buyer should check whether the hole sizes needed for actual projects are available before purchasing the machine.
Never mix punches and dies arbitrarily. Use combinations approved for the specific machine.
Punch-to-Die Clearance
Punch-to-die clearance affects punching load, hole quality, burr formation, and tooling wear.
If the clearance is unsuitable for the material or tooling combination, the machine may produce poorer holes or place unnecessary load on the punch and die.
There is no single universal clearance value suitable for every hydraulic hole puncher and every material.
The correct clearance depends on factors such as:
- material type,
- material thickness,
- punch diameter,
- die design,
- and manufacturer specifications.
For this reason, use the matching tooling specified by the manufacturer rather than attempting to create a universal setup.
Throat Depth / Reach
Throat depth determines how far from the edge of a workpiece the centerline of a hole can be positioned.
This specification is easy to overlook.
Imagine that a hydraulic hole puncher has enough capacity for:
20 mm hole + 6 mm steel
but the required hole center is located too far from the edge of the steel plate for the punching head to reach.
The machine still cannot make the hole.
That means a buyer should check:
Capacity + Tooling + Reach
not capacity alone.
Throat depth becomes particularly important when punching:
- wide flat bar,
- steel plates,
- brackets,
- structural components,
- or holes located well away from the material edge.
Punching Speed
Punching speed affects productivity when many holes are required.
As current examples, POWER ELECTRICAL publishes approximate cycle times of:
| Model | Published Punching Speed |
|---|---|
| MHP-20 | 2 seconds |
| MHP-25 | 4 seconds |
| MHP-32 | 5 seconds |
However, never compare speed by itself.
A 2-second cycle and a 5-second cycle may represent machines designed for very different capacities.
Always evaluate:
Punching Speed + Hole Diameter + Material Thickness + Material Type
Corded vs. Cordless Power
Choose a corded hydraulic hole puncher when repetitive punching and continuous mains power are priorities.
Choose a cordless hydraulic hole puncher when mobility and rapid deployment are more important.
POWER ELECTRICAL currently offers MHP-20, MHP-25, and MHP-32 corded machines, while the MHP-20B is listed as a cordless model using a brushless motor and lithium-battery platform.
The practical decision is:
Corded → repetitive work near reliable power
Cordless → mobile, elevated, or remote work
Neither system is automatically better.
Machine Weight and Portability
A portable hydraulic hole puncher should have enough capacity for the application without becoming unnecessarily difficult to move.
Published net weights for the current corded POWER ELECTRICAL models illustrate how capacity and machine size can increase together:
- MHP-20: approximately 12 kg
- MHP-25: approximately 25 kg
- MHP-32: approximately 34.5 kg
This leads to the same buying principle that applies to many professional portable tools:
Do not automatically choose the largest machine available.
A contractor primarily punching smaller holes through relatively thin material may gain more productivity from a lighter machine than from carrying unused maximum capacity.
Hydraulic System
The hydraulic system is responsible for converting motor power into linear punching force.
A typical system includes:
- electric or brushless motor,
- hydraulic pump,
- hydraulic oil,
- reservoir,
- cylinder,
- piston,
- seals,
- and control or return components.
Hydraulic systems use fluid pressure to transmit force, which is why they can generate substantial linear force within a relatively compact mechanism.
Do not compare hydraulic hole punchers solely by motor wattage.
The complete machine design determines punching capability.
Punch and Die Durability
Punches and dies are wear components.
Their service life depends on:
- material strength,
- material thickness,
- hole diameter,
- tooling alignment,
- correct clearance,
- punching frequency,
- lubrication or maintenance requirements,
- and whether the machine is operated within rated capacity.
There is no meaningful universal statement such as:
“One punch lasts X holes.”
Actual life varies with operating conditions.
For a professional buyer, a better question is:
Can replacement punches and dies be obtained quickly and at a reasonable cost?
Hole Quality
Good punched holes depend on more than hydraulic power.
Important factors include:
- sharp punch condition,
- die condition,
- correct alignment,
- appropriate clearance,
- correct material positioning,
- and use within rated capacity.
Buyers should consider:
- excessive burr,
- deformation around the hole,
- hole shape,
- tool marks,
- and consistency between repeated holes.
A machine with suitable tooling and correct setup should produce more consistent results than a worn or mismatched punch-and-die combination.
Duty Cycle and Working Environment
The correct machine depends heavily on how frequently it will be used.
A maintenance technician creating several holes per week has different requirements from a fabrication operation punching many holes every day.
Before purchasing, estimate:
- holes per day,
- common hole sizes,
- maximum hole diameter,
- typical material thickness,
- material type,
- working location,
- electrical availability,
- and how often the machine must be transported.
This prevents both underbuying and overbuying.
Spare Parts and Serviceability
For professional buyers, serviceability should be considered part of the specification.
Potential replacement items include:
- punches,
- dies,
- hydraulic seals,
- switches,
- hydraulic components,
- motor components,
- batteries,
- and chargers.
Punch-and-die availability is particularly important because the machine cannot produce the required hole without the correct tooling.
Corded vs. Cordless Hydraulic Hole Punchers
| Factor | Corded Hydraulic Hole Puncher | Cordless Hydraulic Hole Puncher |
|---|---|---|
| Power Source | 110 V / 220 V mains, depending on model | Rechargeable lithium battery |
| Mobility | Moderate | High |
| Continuous Operation | Strong with reliable electrical supply | Depends on available battery capacity |
| Cable Management | Required | Not required |
| Setup | Requires power access | Fast deployment |
| Elevated Work | Less convenient | More convenient |
| Remote Jobsites | Less convenient | Strong advantage |
| Battery Management | None | Required |
| Best For | Repetitive workshop/site punching | Mobile installation and field work |
Which Should You Choose?
Choose corded when the machine stays near reliable electrical power and repetitive punching is the priority.
Choose cordless when crews move frequently, work at height, operate around large structures, or cannot conveniently access mains power.
For cordless equipment, battery quantity should be planned according to actual workload.
Hydraulic Hole Puncher vs. Drilling
Hydraulic punching and drilling can both create holes in metal, but they use fundamentally different processes.
| Factor | Hydraulic Punching | Drilling |
|---|---|---|
| Hole-Making Method | Punch-and-die shearing | Rotating cutting tool removes material |
| Tooling | Matching punch and die | Drill bit / cutter |
| Metal Chips | Produces punched slug | Produces chips |
| Access Requirement | Punch and die must access workpiece | Requires drilling access from cutting side |
| Hole Location | Limited by throat/reach | Often more flexible |
| Hole Size Changes | Requires compatible tooling | Change drill/cutter |
| Repetitive Holes | Often efficient within rated range | Application-dependent |
| Material Geometry | Requires punch access | Can work where die access is impossible |
| Typical Use | Repeated holes in suitable plate/components | Flexible general hole making |
Choose Hydraulic Punching When
Hydraulic punching is a strong choice when:
- the required hole size is available as approved tooling,
- material thickness is within rated capacity,
- the workpiece fits inside the punching head,
- the hole location is within throat depth,
- and multiple consistent holes are required.
Choose Drilling When
Drilling may be more appropriate when:
- the puncher cannot reach the hole location,
- the workpiece geometry prevents die access,
- the required hole diameter is not available in the tooling range,
- the material exceeds rated punching capacity,
- or the manufacturing specification specifically requires a drilled or machined hole.
A hydraulic hole puncher is not universally better than a drill. The correct process depends on material, geometry, hole specification, accessibility, and production requirements.
How to Choose a Hydraulic Hole Puncher by Hole Size
A general selection framework is:
| Hole Requirement | Suggested Machine Class | Typical Use |
|---|---|---|
| Smaller holes and lighter material | Compact hydraulic puncher | Installation and maintenance |
| Up to approximately 20 mm class | 20 mm-class professional puncher | General steel construction |
| Larger holes | 25 mm-class puncher where rated | Structural/fabrication work |
| Larger holes and thicker material | Higher-capacity machine | Heavy fabrication/infrastructure |
POWER ELECTRICAL’s current range provides a practical example: the MHP-20, MHP-25, and MHP-32 are designed as progressively larger corded hole-puncher classes.
This table is a general framework, not a universal capacity guarantee.
Always verify:
Hole Diameter + Thickness + Material + Tooling + Manufacturer Rating
How to Choose a Hydraulic Hole Puncher by Material Thickness
Material thickness can change which machine is appropriate even when the required hole diameter remains the same.
Thinner Material
A smaller, lighter hydraulic hole puncher may provide enough capacity and better portability.
There is little reason to carry a much heavier machine if the extra capacity will never be used.
Medium-Thickness Material
Verify both diameter and thickness limits carefully.
This is where buyers commonly make the mistake of checking only the maximum hole number.
Thicker Material
As material thickness increases, manufacturer-rated capacity becomes increasingly important.
Do not assume that moving to a larger punch diameter class automatically guarantees adequate thickness capacity.
The thicker the material, the more important it becomes to verify the rated capacity for the exact hole diameter and material type.
How to Choose a Hydraulic Hole Puncher by Application
Structural Steel Construction
For structural installation, portability, hole size, material thickness, and throat depth are major considerations.
Best approach: Choose a portable machine that covers the actual steel components and hole positions used onsite.
Steel Fabrication
Fabrication environments may require repetitive holes and several tooling sizes.
Best approach: Prioritize punching capacity, tooling range, replacement punch-and-die availability, and duty requirements.
Bridge and Infrastructure Work
Large structures can require operators to move between work areas.
Best approach: Balance capacity against portability. Cordless equipment can be attractive when power access is difficult, provided its rated punching capacity is sufficient.
Electrical and Mechanical Installation
Portable punching equipment can be useful for brackets, supports, and appropriate metal components.
Best approach: Check component geometry and throat depth before assuming the puncher can reach the required location.
Industrial Maintenance
Maintenance teams often value compact equipment that can be transported and stored easily.
Best approach: Choose enough capacity for common repair materials without purchasing excessive weight and tooling.
Remote Job Sites
Cordless tools reduce dependence on extension cables and temporary electrical supply.
Best approach: Select a cordless hydraulic hole puncher only after verifying punching capacity and planning adequate battery availability.
What Determines Hydraulic Hole Punching Capacity?
Punching capacity is the result of several interacting variables.
| Factor | Why It Matters |
|---|---|
| Hole Diameter | Larger holes require more shearing work |
| Material Thickness | Thicker material increases punching demand |
| Material Type | Different metals have different mechanical properties |
| Material Strength | Higher strength can increase punching load |
| Punch Size | Must match the required hole |
| Die Size | Must match approved tooling |
| Punch-to-Die Clearance | Affects load, burr, and tooling performance |
| Hydraulic Output | Provides the linear punching action |
| Machine Structure | Must withstand punching loads |
| Punch Condition | Worn tooling can reduce performance |
| Die Condition | Damaged dies affect hole quality |
| Alignment | Correct tooling alignment is essential |
The key conclusion is:
Punching capacity is a combination of material conditions, hole dimensions, tooling, and machine design—not one single number.
What Is Throat Depth and Why Does It Matter?
Throat depth is the maximum distance from the edge of a workpiece to the centerline of a hole that the machine can physically reach.
Suppose a machine has enough power to punch the required:
Hole Diameter ✓
and:
Material Thickness ✓
but the hole center is located farther from the plate edge than the machine’s throat allows.
The result is:
The machine still cannot make the hole.
This is why throat depth should be checked whenever buyers work with larger plates, wide flat bars, structural components, or holes located away from accessible edges.
It is one of the most commonly overlooked specifications when comparing portable hole punchers.
What Affects the Price of a Hydraulic Hole Puncher?
Price is influenced by more than maximum hole size.
Hole and Thickness Capacity
Higher-capacity machines generally require stronger hydraulic and structural components.
Corded vs. Cordless Design
Cordless equipment adds:
- battery packs,
- chargers,
- battery electronics,
- and typically brushless motor technology.
Hydraulic System
Pump quality, seals, cylinders, valves, and related components influence machine cost and serviceability.
Machine Construction
Increasing capacity can require larger housings, heavier structural components, and stronger punching heads.
Punch and Die Sets
Included tooling can significantly change the value of a package.
Check:
Which sizes are included?
rather than comparing machine price alone.
Spare Tooling
Replacement punches and dies are part of the long-term operating cost.
Manufacturer Support
Technical documentation, spare parts, warranty service, and troubleshooting support have real economic value for professional users.
The lowest purchase price does not necessarily mean the lowest total cost of ownership.
Compare:
Machine + Tooling + Replacement Parts + Downtime + Service Support
Hydraulic Hole Puncher Buying Checklist
Before ordering a hydraulic hole puncher, confirm:
- Required hole diameter — What hole sizes do you actually need?
- Maximum material thickness — What is the thickest material?
- Material type — Mild steel, carbon steel, stainless, or another material?
- Material strength — Does the manufacturer rate the machine for it?
- Punch sizes — Are the required diameters available?
- Die sizes — Are matching dies available?
- Punch/die compatibility — Are they approved combinations?
- Throat depth — Can the machine reach the intended hole location?
- Punching speed — Is it suitable for expected volume?
- Power source — Corded or cordless?
- Voltage — For corded equipment, confirm 110 V or 220 V as required.
- Machine weight — How frequently will it be moved?
- Daily punching volume — Occasional or repetitive use?
- Replacement punches — Are they readily available?
- Replacement dies — Can they be sourced easily?
- Hydraulic spare parts — Are seals and service parts available?
- Battery availability — For cordless models, can additional batteries be supplied?
- Technical documentation — Are operation and maintenance instructions available?
- Technical support — Can the supplier support troubleshooting?
- Workpiece geometry — Can the punch and die physically access the required location?
Common Mistakes When Buying a Hydraulic Hole Puncher
Mistake 1: Choosing Only by Maximum Hole Diameter
A 20 mm hole rating does not tell you how thick or strong the material can be.
Always check diameter and thickness together.
Mistake 2: Ignoring Material Thickness
A machine may handle the required hole size in thinner material but not in thicker plate.
Mistake 3: Ignoring Material Strength
Do not apply mild-steel capacity automatically to every type of metal.
Mistake 4: Assuming the Machine Can Punch Any Metal
Every machine has a rated operating range.
Verify stainless steel, high-strength steel, or other materials separately.
Mistake 5: Using the Wrong Punch and Die Combination
Mismatched tooling can affect hole quality, load, wear, and potentially damage equipment.
Use manufacturer-approved combinations.
Mistake 6: Ignoring Throat Depth
A machine can have enough punching capacity but still fail to reach the intended hole location.
Mistake 7: Choosing Cordless Without Considering Battery Demand
Cordless mobility is valuable, but high daily workloads require appropriate battery planning.
Mistake 8: Ignoring Replacement Tooling
Punches and dies wear over time.
Verify availability before purchasing the machine.
Mistake 9: Comparing Only Purchase Price
A lower initial price may not compensate for difficult-to-source tooling or extended downtime.
Mistake 10: Assuming Punching Is Always Better Than Drilling
Punching has important productivity advantages in suitable applications, but drilling can be more appropriate when geometry, accessibility, tooling, or specifications prevent punching.
Frequently Asked Questions About Hydraulic Hole Punchers
What is a hydraulic hole puncher?
A hydraulic hole puncher is a powered metalworking tool that uses hydraulic force to drive a punch through metal into a matching die.
It creates the hole through a shearing process rather than removing material progressively with a conventional drill bit.
How does a hydraulic hole puncher work?
An electric or battery-powered motor drives a hydraulic pump, which moves hydraulic fluid and develops pressure under load.
That pressure acts on a piston, which drives the punch through the metal and into the die. Hydraulic systems rely on pressure transmission through enclosed fluid to convert input energy into useful force.
What materials can a hydraulic hole puncher punch?
It depends on the specific model and manufacturer rating.
Many machines are designed for steel applications, but users should not assume that capacity for ordinary steel applies equally to stainless, hardened, or higher-strength materials.
How thick can a hydraulic hole puncher punch?
Maximum thickness varies substantially by model and material.
For example, POWER ELECTRICAL currently publishes 6 mm for the MHP-20, 12 mm for the MHP-25, and 15 mm for the MHP-32. These figures should always be evaluated with the specified material and tooling requirements.
What hole sizes can a hydraulic puncher make?
Available hole sizes depend on the punch-and-die tooling provided or approved for the machine.
For example, the current MHP-20 product page lists tooling from 6.5 mm to 20.5 mm, while the MHP-25 lists several sizes through 25.5 mm.
Why do punch and die sizes need to match?
The punch and die work together as one cutting system.
Correct matching provides the intended clearance and supports proper shearing of the material. Incorrect combinations can affect hole quality, tool wear, and punching load.
What is throat depth on a hydraulic hole puncher?
Throat depth is the distance the punching head can reach from the edge of the workpiece to the intended hole center.
If the hole is farther from the edge than the machine can reach, adequate punching force alone will not make the application possible.
Is a hydraulic hole puncher better than a drill?
Not in every application.
A hydraulic puncher can be highly efficient for repetitive holes when the material, thickness, hole diameter, tooling, and access are within its rated range. Drilling may be better when the hole cannot be reached by the punching head or when die access is impossible.
Can a hydraulic hole puncher punch stainless steel?
It depends on the specific model, stainless-steel grade, material thickness, hole diameter, tooling, and manufacturer rating.
Do not use mild-steel capacity as proof of stainless-steel capability unless the manufacturer explicitly approves the application.
Are cordless hydraulic hole punchers powerful enough for construction work?
Yes, when their rated capacity matches the material and hole requirement.
POWER ELECTRICAL currently lists the MHP-20B as a cordless brushless lithium-powered hole puncher intended for steel plate, brackets, construction, fabrication, and maintenance applications.
How long do hydraulic puncher punches and dies last?
There is no universal service-life number.
Tool life depends on material strength, thickness, hole diameter, alignment, clearance, frequency of use, maintenance, and whether the machine is operated within rated capacity.
How do I maintain a hydraulic hole puncher?
Typical maintenance includes inspecting the punch, die, punching head, fasteners, hydraulic system, electrical components, and checking for leakage or abnormal wear.
Power should be disconnected or the battery removed before servicing according to the manufacturer’s instructions. OSHA’s machine-guarding rules emphasize protection around points of operation and hazards including moving parts, flying chips, and sparks.
What affects the price of a hydraulic hole puncher?
Capacity, power source, hydraulic design, machine construction, included tooling, batteries, chargers, replacement punches and dies, and manufacturer support can all influence price.
Professional buyers should compare total ownership cost rather than machine price alone.
Final Buying Recommendation
The correct hydraulic hole puncher depends on the combination of hole size, material thickness, material properties, tooling, reach, workload, and working environment.
General Contractors
Choose a portable hydraulic hole puncher that safely covers the common hole sizes and steel thicknesses used onsite.
Do not purchase unnecessary weight simply for capacity that will rarely be used.
Structural Steel Installers
Prioritize:
capacity + throat depth + portability
A powerful machine is not useful if the punching head cannot reach the required hole location.
Steel Fabricators
Prioritize:
tooling range + punch/die availability + repeatability + workload
For frequent production, replacement tooling availability can be as important as initial machine specifications.
Mobile Construction Crews
Choose a cordless hydraulic hole puncher when mobility and independence from mains electricity are priorities, provided its punching capacity is sufficient.
Industrial Maintenance Teams
Choose a compact professional machine with enough capacity for common maintenance materials and reliable replacement tooling support.
Tool Distributors
Offer several capacity and power-source options rather than promoting one universal model.
POWER ELECTRICAL currently offers corded MHP-20, MHP-25, and MHP-32 hydraulic hole punchers and the cordless MHP-20B, providing different capacity and mobility options for professional applications. POWER ELECTRICAL has specialized in portable electro-hydraulic tools since 2001.
The final buying rule is:
The best hydraulic hole puncher is not necessarily the machine with the largest hole capacity. It is the machine that safely matches the required hole diameter, material thickness, material strength, tooling, reach, workload, and working environment.