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We are your perfect partner for high-quality perforated metal sheets for creative, robust and versatile materials for façades, external applications and visual protection. We fulfil our customers’ wishes by means of our extensive portfolio in serial production; we also offer special products and individual creations upon request. Here we take our guidance from the legal provisions whereby the term “perforated plate” (perforated metal sheet) is defined in the DIN-standards 24041:2002-12 and DIN 4185 part 2. We work within the DIN-tolerances to take into consideration the different factors that impact the accuracy of the perforated metal sheets.
Our high-quality material is well suited for every kind of project and form. It can be processed in several ways: cutting by means of state-of-the-art guillotine cutters, laser cutting, fine beam plasma cutting, bending, rounding and welding.
Finishings such as powder-coating, painting, pickling, electro-polishing of stainless steel, sandblasting or glass bead blasting are various options to use our perforated sheets in a meaningful and visually attractive way.
Many of our perforated metal sheets can also be produced in the form of embossed sheets. Due to their structure, they exhibit a high degree of rigidity despite their low weight. The term “embossed metal sheet” is mainly used in Austria, otherwise it is referred to as “pressed metal sheets” or “structure metal sheet”.
The term “perforated plate” (perforated metal sheet) is defined in the DIN-standard 24041:2002-12 and in DIN 4185 part 2.
We use the DIN-tolerances to take into consideration the different factors that impact the accuracy of the perforated sheets. Dimensional deviations for perforated metal sheets are evident in DIN 24041. Deviations from the nominal dimension may occur due to raw material tolerances, perforation and subsequent machine straightening.
We would like to point out that metal sheets and plates with fixed dimensions do not undergo additional cutting after perforation and straightening. The deviations may exceed the steelwork tolerance.
| Dimension plate length plate width |
Permissible tolerance for material thickness up to 5 mm |
Permissible tolerance for material thickness above 5 mm |
|---|---|---|
| up to 100 mm | +/- 0.8 mm | +/- 1.5 mm |
| above 100 to 300 mm | +/- 1.2 mm | +/- 2.0 mm |
| above 300 to 1000 mm | +/- 2.0 mm | +/- 3.0 mm |
| above 300 to 2000 mm | +/- 3.0 mm | +/- 5.0 mm |
| above 1000 to 4000 mm | +/- 4.0 mm | +/- 8.0 mm |
| above 2000 to 4000 mm | +/- 5.0 mm | +/- 10.0 mm |
In the course of the perforation process, the perforated field is expanded, i.e. the metal sheet’s length and width change. The finishing treatment, in particular, straightening, results in expansions in the perforated field. As the dimension of the deviations is influenced by factors such as hole size, arrangement of the holes, thickness and type of material, it cannot be defined up front.
| Material thickness | Permissible perpendicularity tolerance |
|---|---|
| up to 5 mm | +/- 0.5 degrees (=0.9 mm for every 100 mm length) |
| above 5 to 15 mm | +/- 0.5 degrees (=0.9 mm for every 100 mm length) |
| above 15 to 25 mm | +/- 0.5 degrees (=0.9 mm for every 100 mm length) |
| Division -t | Permissible deviations for e1, e2, f1, f2 |
|---|---|
| up to 5 mm | +/- 5 mm |
| above 5 to 20 mm | +/- 10 mm |
| above 20 mm | +/- t/2 |
Edge bows may occur on perforated sheets. This results in a deviation between the metal sheet’s edge’s middle and ends. For metal sheet thickness of up to 3 mm a max. deviation of 1.5 % of the total length is permissible, for metal sheet thickness of more than 3 mm a maximum of 2 % of the total length is accepted.
The side that is usually depicted in a drawing of a perforated metal sheet (top view) is called punch entry side, whereby the punching burr is underneath. The burr-side must be specified explicitly for non-symmetrical plates and sheets that are subsequently processed. Usually, the cutting burr and the punching burr are on the same side but in the course of certain activities with scissors, they may be on opposite sides. If the cutting burr and the punching burr must be on the same side, this must be explicitly agreed in advance.
| Sheet thickness | Burr height |
|---|---|
| up to 0.6 mm | 0.15 mm* |
| above 0.6 mm to 1.5 mm | 0.17 mm* |
| above 1.5 mm to 3.0 mm | 0.20 mm* |
| above 3.0 mm to 6.0 mm | 0.25 mm* |
| above 6.0 mm | 0.50 mm* |
Up to 10 % of the perforated surface or 10 % of the number of holes may be outside these tolerances. The burr can be pushed back into the hole in the course of the straightening process.
Perforated metal sheets can be machine-straightened. We supply 3 different versions of perforated metal sheets: not straightened, machine-straightened and precision-straightened. As a general rule, our perforated metal sheets are machine-straightened to guarantee the required evenness tolerances in accordance with DIN. Due to deviations of the side edges, unperforated areas, high culverts and certain material qualities, residual tension in the metal sheet cannot be excluded. If you have specific requirements regarding evenness, you must discuss and agree them with us in advance.
During the perforation process the stamp may break partially or fully. To avoid this, the stamps are usually arranged in a staggered way; as a result the first and last rows of holes in the feed direction are incomplete.
| Hole shapes | Hole positions |
|---|
| Symbol | Code/Explanation | Display | Code/Explanation |
|---|---|---|---|
 | R Rounded hole |  | Rt Round hole in staggered rows |
 | Ru Rounded hole in straight rows | ||
 | Rm Rounded hole in diagonal staggered rows | ||
 | C Square perforation hole side parallel to the metal sheet |  | Cu Square perforation in straight rows |
 | Cz Square perforation in staggered rows | ||
 | Cd Square perforation hole side diagonal to the metal sheet |  | Cd Square perforation in diagonal staggered rows |
 | L Slotted perforation with round corners |  | Lru Slotted perforation in straight rows |
 | Lrz Slotted perforation in staggered rows | ||
 | Lc Slotted perforation with sharp corners |  | Lcu Slotted perforation, angular in straight rows |
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Fr : 07:30 AM – 2:00 PM
