Basic Terms
hole size
What is the hole size?
The hole size describes the size of an individual opening. For round perforations, for example, it corresponds to the hole diameter; for square perforations, to the side length.
Pitch
What does pitch mean in a perforated sheet?
The pitch is the distance from the centre of one hole to the centre of the next. Together with the hole size, it determines, among other things, the bridge width and the open area of the perforated sheet.
Bridge Width
What is the bridge width?
The bridge width is the material remaining between adjacent openings. It is determined by the relationship between the hole size and pitch and influences, among other things, the stability of the perforated sheet.
Open Area
What does “open area” mean?
The open area indicates the percentage of the total surface area that is actually open due to the perforations. It is an important technical parameter, particularly for applications such as filtration, ventilation, and screening.
Unperforated Margins
Why do perforated sheets have unperforated margins?
Not every perforated sheet is perforated all the way to the outer edge. Unperforated margins may be required for design purposes or for fastening, bending, welded joints, and further processing.
Perforations
What hole shapes are available?
The most common hole shapes include round, square, and slotted perforations. Hexagonal perforations and a wide range of special perforations are also available. The most suitable hole shape depends on the specific application and technical requirements.
What hole patterns are available?
In addition to the hole shape, the hole pattern determines the properties and appearance of a perforated sheet. The abbreviations indicate how the individual holes are arranged in relation to one another.
What do the abbreviations RvT, RvZ and RvM mean?
RvT – Round perforation, 60° staggered pattern
RvU – Round perforation, straight or rectangular pattern
RvM – Round perforation, 45° staggered pattern
How is a perforation specified?
A perforation is clearly specified by the hole shape, hole size, and pitch. For example, in the designation Rv 5-8, “R” stands for round perforation, “5” for a hole size of 5 mm, and “8” for a pitch of 8 mm.
Which perforation is suitable for which application?
The appropriate perforation depends on the intended function of the component. Depending on the application, factors such as a high open area, a specific flow rate, defined screening performance, stability, or aesthetic requirements may be decisive.
Are custom perforation patterns possible?
Yes. In addition to standard perforations, we can also produce custom perforation patterns, perforated areas, and hole arrangements according to customer specifications. Technical feasibility depends on factors such as the material, sheet thickness, hole geometry, and required dimensions.
Dimensions & Manufacturing
What tolerances apply to perforated sheets?
The achievable dimensional tolerances depend on factors such as the material, sheet thickness, dimensions, perforation, and manufacturing process. Any specific requirements regarding dimensional accuracy or tolerances should be specified at the enquiry stage.
DIN 24041
DIN 6930T2
How flat are perforated sheets?
The punching process creates stresses in the material that can affect the flatness of a perforated sheet. Factors such as hole size, pitch, sheet thickness, material, and unperforated areas all play a role.
Depending on the requirements, additional levelling and processing steps can be carried out.
What is the burr side of a perforated sheet?
During punching, the punch enters the material from one side. This can create a punching burr on the opposite side.
If the orientation of the component is relevant for its subsequent use or further processing, the required burr side should be specified when placing the order.
What should be considered at the beginning and end of the perforated area?
Depending on the perforation, tooling, and manufacturing process, the beginning and end of a perforated area can be designed differently.
If a specific configuration or a defined distance from the edge of the component is required, this should be specified in the drawing.
Does the manufacturing direction matter?
For certain perforations and component geometries, the manufacturing direction can affect the finished component. This can be particularly relevant for further processing, bending, or applications with demanding visual requirements.
If a specific orientation is required, it should be specified in the technical drawing.
Technical Enquiries & Ordering
What information is required for an enquiry?
The more precise the technical specifications, the faster we can review your enquiry. Ideally, please provide us with the following information:
- material
- sheet thickness
- dimensions
- hole shape
- hole size
- pitch
- hole pattern
- unperforated areas or margins
- quantity
If available, you can also send us a technical drawing directly.
How should a perforation be specified?
For a clear specification, the hole shape, hole size, pitch, and hole pattern should be provided.
For example, the designation Rv 5-8 describes a round perforation with a hole size of 5 mm and a pitch of 8 mm. Additional information on the hole pattern or orientation can be included to further define the specification.
How are unperforated margins specified?
Unperforated margins are defined by their width on each side of the component. If the margin widths differ, they should be clearly assigned to the respective sides and shown in a technical drawing.
Unperforated areas within a component can also be incorporated according to technical specifications.
Can we manufacture according to drawings?
Yes. We manufacture perforated sheets and further-processed components according to customer specifications and technical drawings.
We review the specified dimensions, perforations, and other requirements to ensure they are technically feasible for manufacturing.
What further processing options are available?
In addition to manufacturing perforated sheets, we can also carry out further processing steps directly. These include cutting, bending, welding, forming, surface finishing, and assembly.
Depending on the requirements, we can therefore manufacture not only perforated sheets, but also further-processed components and complete assemblies..
Are series production and high volumes possible?
Yes. Our production is designed to handle both custom requirements and recurring series parts, as well as high-volume production.
Standardized processes, a versatile range of machinery, and a high degree of automation enable repeatable production processes and consistent quality throughout the entire production run.