Screw hole punches
Screw hole punching from RUKO: Precise openings in steel, stainless steel and aluminium
Discover our range of high-quality RUKO screw hole punches for clean and burr-free holes in steel, stainless steel and aluminium. Screw hole punches enable precise openings in sheet metal and housings up to a material thickness of approx. 4 mm - without time-consuming drilling of large diameters.
Screw hole punches have proven to be a tried and tested tool, particularly in switch cabinet construction, electrical installation and mechanical and plant engineering, when dimensionally accurate openings are required for cable glands, connectors or control elements.
Mechanical punching produces a clean cut edge and minimises material distortion. RUKO screw hole punches therefore enable precise and reproducible openings with a high level of cost-effectiveness.
Productfinder
What is a screw hole punch?
A screw hole punch - often also called a hole punch - is a tool for producing precise openings in sheet metal and housings. Unlike drilling tools, the material is not removed by chip removal, but is cut out cleanly by a punching process.
A tension screw pulls the punch through the workpiece into the die. The material is separated along the cutting edge and removed as punching waste.
The results are dimensionally accurate perforations with a smooth cutting edge and minimal burr formation. When clean, precise perforations are required, screw hole punches are therefore particularly suitable for thin-walled metals. Deformation of the material is minimized through the use of screw hole punches.
Advantages of screw hole punching over drilling or hole saws
Screw hole punches offer several advantages over drilling or milling processes. They enable precise perforations with a clean cut edge and high dimensional accuracy, particularly for openings in thin-walled sheet metal.
Clean cutting edge The material is separated along the cutting edge. This generally results in very burr-free perforations.
High dimensional accuracy The precise cutting gap between the punch and die ensures exact hole diameters.
No thermal stress No heat is generated during punching unlike with drilling or cutting.
Material-friendly processing The workpiece is hardly deformed, making screw hole punching particularly suitable for thin-walled sheet metal.
Efficient series processing Openings can be produced quickly and reproducibly for recurring hole sizes.
These properties make screw hole punches a particularly economical solution for precise openings in sheet metal and housings - for example in switch cabinet construction, installation technology or mechanical engineering.
Typical areas of application for screw hole punches in industry and installation
Typical areas of application for screw hole punches in industry and installation
Screw hole punches are used wherever precise holes are required in sheet metal and material distortion needs to be minimized, e.g. when installing a kitchen tap.
Switch cabinet and housing construction
- Openings for cable glands
- Mounting openings for plug connectors
- Feed-throughs for operating elements
- Ventilation openings in enclosure doors
Dimensionally accurate openings are crucial to ensure that screw fittings and components fit exactly.
Electrical installation and building services engineering
- Cable feed-throughs in distribution boards and housings
- Openings for installation components
- Feed-throughs for control cables and sensors
The clean cut edge reduces rework and facilitates the installation of screw fittings and seals.
Mechanical and plant engineering
- Openings in housing panels
- Mounting openings for control panels
- Technical openings in covers and panels
Screw hole punches enable precise perforations without thermal stress on the material.
Whether in switch cabinet construction, electrical installation or mechanical engineering - screw hole punches ensure clean, dimensionally accurate openings in sheet metal and housings.
Choose the right screw hole punch: Diameter, material and material thickness
When selecting a suitable screw hole punch, the required hole size, the material and the thickness of the material are the most important factors.
Hole diameter
The required diameter depends on the cable gland or component used.
Typical hole sizes in switch cabinet construction are, for example:
| Cable gland | Hole diameter |
|---|---|
| M16 | approx. 16.2 mm |
| M20 | approx. 20.4 mm |
| M25 | approx. 25.5 mm |
| M32 | approx. 32.5 mm |
| M40 | approx. 40.5 mm |
| M50 | approx. 50.5 mm |
Precise dimensional accuracy is essential to ensure that screw connections and seals fit properly.
Choose the right screw hole punch: Diameter, material and material thickness
Material thickness
The maximum possible material thickness varies depending on the tool and material. Standard screw hole punches are generally suitable for sheets up to approx. 4 mm.
The material thickness to be processed depends heavily on the thickness of the lag screw.
The required punching force increases with the material thickness. For this reason, stronger lag screws or hydraulic systems must be used for stainless steel or high-strength materials, for example.
Material
Screw hole punches can be used for various materials, including
- Sheet steel
- Stainless steel
- Aluminium
- Other non-ferrous metals
The wear and required punching force vary depending on the material.
Pulling screw and actuation
The punching force is transmitted to the tool by the draw screw. High-quality lag screws have hardened threads and ensure uniform force transmission.
Hydraulic actuators can be used to reduce the required punching force when working with larger diameters or thicker materials.
The right combination of hole diameter, material and material thickness ensures precise punching, long tool life and efficient work processes.
Types of screw hole punches and punching systems
Types of screw hole punches and punching systems
Depending on the area of application, hole diameter and material thickness, different types of screw hole punches are available. The choice of the right type depends primarily on the area of application and the required punching forces.
Round screw hole punches
The most common design for cable glands and bushings. They produce precise round holes and are mainly used in switch cabinet construction.
Hydraulic punching systems
Hydraulic actuators are used for larger hole diameters or thicker materials. These reduce the force required and enable more efficient processing.
Which type is most suitable depends primarily on the hole diameter, material thickness and the available punching force (manual or hydraulic).
Screw hole punches with ball bearing
The ball bearing makes handling even easier and faster. The effort required is reduced by approx. 67%.
Application of screw hole punches: Tips for precise punching
To achieve clean results, a few basic steps should be followed when using screw hole punches:
- Drill a suitable pilot hole for the lag screw (e.g. with a sheet drill or metal drill)
- Securely fix the workpiece
- Before use, the lag screw should be lubricated with cutting spray or cutting paste.
- Tighten the lag screw evenly
- Keep cutting surfaces clean
- Remove punching residues regularly
If necessary, small burrs can then be removed with rotary burrs or deburring tools.
Proper use reduces wear and extends the service life of the screw hole punches.
You can also find practical step-by-step instructions in our blog post "How do I punch a hole in the sink?"
FAQs Screw hole punches
A pilot hole must be drilled before using a screw hole punch. This is used to guide the lag screw through the workpiece.
The required diameter of the pilot hole depends on the size of the lag screw, depending on the tool type and hole diameter.
A properly executed pilot hole facilitates the punching process, prevents the tool from tilting and ensures precise alignment of the punch and die.
Screw hole punching is particularly advantageous when precise perforations are required in thin-walled sheet metal with low material distortion. The punching process produces very dimensionally accurate openings with a clean cut edge.
Hole saws, on the other hand, work by cutting and are more flexible with different materials and material thicknesses. They are therefore more suitable for thicker materials or greater cutting depths.
The maximum material thickness depends on several factors, including hole diameter, material and tool design. Standard screw hole punches are often used for sheet metal up to around 2 to 3 mm thickness.
For softer materials such as aluminium, greater material thicknesses are sometimes possible. Higher punching forces are required for stainless steel or high-strength steels, which can lead to a lower maximum material thickness.
The manufacturer's specifications should be consulted here.
For significantly thicker materials or solid materials, hole saws are often the better choice, as these are specially designed for greater material thicknesses and solid material.