Designations for standard types of perforation are established by ISO standard 7806. Decorative perforations are identified by the perforator’s own codes. The designation of a perforation is made of letters or numbers indicating, in the following order:

  • shape and size of holes
  • arrangement and pitch of holes
Please find here below some examples of Schiavetti Lamiere forate’s designations

Shape and size of holes

R 10 – Round

Symbol R followed by diameter oh hole

Arrangement and pitch of holes

T 15 – 60° Staggered pitch

Symbol T followed by pitch = 15 mm

U 15 – 90° Square pitch

Symbol U followed by pitch = 15 mm

Round holes are usually ordered with arrangement 60° staggered pitch,since it is characterised by a high rigidity of the perforated metal even with a tolerable open area.

It is available upon request the arrangement with square pitch , usually indicated for commercial forniture,exhibitor panels and aesthetic uses (false ceilings, building facades,etc.)

Shape and size of holes

C 10 – Square

Symbol C followed by length of side

Arrangement and pitch of holes

U 15 – 90° square pitch

Symbol U followed by pitch = 15 mm

Square holes are usually ordered in parallel lines and are used both for aesthetic use (fences, gates, etc) and for agri-food and mining industry for sieves.

Shape and size of holes

H 2 – Hexagonal

Symbol H followed by diameter of inscribed circle

Arrangement and pitch of holes

T 2,5 – 60° Staggered pitch

Symbol T followed by pitch = 2,5 mm

Hexagonal holes allow perforated metal to maintain its characteristics of high resistance even with a high ratio of open area, which is necessary when a high level of aeration rate (masks for tractors) or an excellent acoustic performance are required (microphones and speakers)

Shape and size of holes

LR 5 X 20 slot with round ends

Symbol LR followed by lenght of short and long axis

Arrangement and pitch of holes

U 25 X 20 – Straight pitch

Symbol U followed by pitches p1 and p2 (pitch p1 parallel to the smaller axis of the hole is indicated first)

Z 25 X 20 – Staggered pitch

Symbol Z followed by pitches p1 and p2 (pitch p1 parallel to the smaller axis of the hole is indicated first)

Slot with round ends holes are normally used for filtering and separating liquids or solids. Their arrangement is especially important in screening, where the material to be selected must not meet free areas. For this type of application the staggered pitch arrangement is unavoidable. Their use is increasing also for exhibitor panels.

Identification codes of our decorative holes

FS 8 Bis


FS 9 Bis


FS 19


FS 19 Bis

FS 45


FS 8


FS 9

Sheets perforated with decorative holes are mainly used for their aesthetic features. The shape of the holes varies and there are often different types of holes in the same sheet. There are no standards referring to decorative holes and each perforator uses its own identification codes.

Often, customers buying decorative holes, needs also anodised sheets, in order to improve the aesthetic performance of the product, as shown in the above listed selection.

ADERSTOP® is a walkable perforated sheet with high adherence, which combines rigidity with the following characteristics:

  • 360° antislip: the countersunk round holes grant an excellent grip in any direction;
  • drainage: flat round holes provide easy and quick drainage for liquids;
  • heel protection: the diameter of the countersunk and flat holes is smaller than the diameter of high heels (8 mm);
  • antipanic: transparency is limited to 10%

ADERSTOP® is made of common steel (galvanized on request), stainless steel and aluminum. ADERSTOP® steps and profiles are mainly used for the construction of external safety stairs.

Fortop holes are used almost exclusively for the commercial furnishing sector, mostly in workshops, ironmongeries, workbenches in general, given the particular combination of round holes and keyholes, specific to hang hooks and objects.