Perforated sheet metal

decorativegalvanized steelStainless Steel 304

Product overview
Perforated metal with slot holes offers high material flow and efficient separation, ideal for filtration, sorting and drying. Slot hole perforation (elongated hole perforation) is available with round-ended slot holes (LR) or square-ended rectangular holes (LC), suitable for applications requiring precision, high throughput and controlled sorting.

Types

• Round-ended slot holes (LR): also known as rounded rectangular slots or round-ended slots.
• Square-ended rectangular holes (LC): also known as square-ended slots or rectangular slots.

Patterns available

• Staggered rows (Z) for enhanced structural strength and material flow.
• Straight rows (U) for predictable airflow and controlled separation.
• Herringbone and chessboard layouts for specialised sieving, sorting or decorative purposes.

Key benefits of slot hole perforation

• Enhanced material flow: ideal for sorting, sieving and filtration, ensuring efficient separation of materials.
• Optimised airflow and drying: facilitates ventilation and moisture control in processing applications.
• Functional and aesthetic: combines performance with design for industrial and architectural uses.

Application examples

• Sieving and sorting: grain processing, seed cleaning and malting floors for precise separation.
• Filtration and drying: food processing, fodder mills and pellet production for controlled airflow and efficient drying.
• Industrial screening: recycling, bulk material handling and separation processes for effective classification.
• Ventilation and cooling: server cabinets, air vents and industrial machinery for optimal airflow and heat dissipation.
• Architectural applications: facades, sunscreens and decorative panels offering visual and airflow control.

Types of slot holes (details)

• Round-ended (LR) — round-ended slot holes (rounded rectangular slots).
• Square-ended (LC) — square-ended rectangular holes.

Arrangement of holes

• Z = Staggered pitch: balanced open areas and structural stability; improves flexibility and strength.
• U = Rectangular pitch (straight rows): uniform grid-like pattern with consistent structural strength and open area.
• 45° diagonal (LRD): diagonal alignment with rectangular pitch for efficient airflow and decorative appearance.
• Herringbone (LRDD): 45° diagonal herringbone-like alignment for a distinct visual pattern while maintaining airflow control.
• Cross / chessboard: cross alignment with rectangular pitch producing a chessboard-like pattern that balances structural integrity and ventilation.

Beginning and end of perforated areas

• Closed end pattern: special tooling creates a uniform, finished edge at the start and end of the perforated area; suitable for visible/decorative applications (more complex, may extend production time).
• Semi-closed end pattern: partially finished edge offering improved appearance with moderate cost.
• Open end pattern: standard option with partial or irregular rows at edges due to the stepped perforating process; efficient and economical, suitable when edges will be framed or hidden.

Materials

• Available materials include mild steel, stainless steel, galvanised steel, aluminium, brass and other alloys.

Characteristics / technical specifications

• Hole types: LR (round-ended slot) and LC (square-ended rectangular slot).
• Pitch configurations: Z (staggered), U (rectangular/straight rows), diagonal 45° and herringbone arrangements.
• Edge finish options: closed end, semi-closed end, open end.
• Common materials: mild steel, stainless steel, galvanised steel, aluminium, brass, other alloys.
• Typical uses: filtration, sieving/sorting, drying, industrial screening, ventilation/cooling, architectural panels.