Perforated sheet metal

decorativesteelstainless steel

Overview
Round hole perforation is the most common choice for both functional and decorative uses. It is valued for strength, high open-area possibilities and design versatility. Round holes provide large open areas while remaining geometrically stable, making them suitable for filtration, airflow, acoustic and architectural applications.

Key benefits

• Provide excellent strength and large open area for filtration, airflow, sound control or material flow.
• Available in hole sizes from 0.3 mm.
• Offered in a variety of hole arrangements: triangular (T), staggered (Z), diagonal (M/45°), rectangular/straight (U) and decorative patterns.
• Suitable for many materials to meet both technical and aesthetic requirements.

Applications examples

• Agriculture: sieves for sorting and grading seeds, stones and other materials.
• Recycling and bulk handling: sorting of bulk materials in recycling operations.
• Building industry: facades, sun protection, balustrades and balcony infill panels where aesthetic and functional performance is required.
• Ventilation and safety: protection and ventilation panels for machinery, IT equipment, doors, windows and gates providing safety with airflow.
• Acoustics: sound absorption solutions that combine acoustic performance and design flexibility.

Arrangement of holes
Round holes (R) are commonly offered with several pitch/arrangement types, each giving different open area and strength characteristics:

• T = Triangular pitch (60° staggered): common configuration providing high mechanical strength and high open area; equal spacing maintains uniform strength even with reduced pitch.
• Z = Staggered pitch: balanced open area and structural stability, suited for airflow and durability.
• M = Diagonal pitch (45°): distinctive visual appearance with moderate open area; useful for design-focused applications.
• U = Rectangular pitch (straight rows): grid-like pattern with predictable strength and controlled airflow.

Beginning and end of perforated areas (pattern edges)
Perforated areas can be finished in different ways depending on visual and functional requirements:

• Closed end pattern: special tooling to create a uniform, continuous edge at the start and end of the perforated area; gives a clean, decorative finish but increases cost and production time.
• Semi-closed end pattern: balanced option offering improved appearance at a lower cost than fully closed patterns; a compromise between finish and economy.
• Open end pattern: standard economical option where the perforated area begins and ends with partial or irregular rows due to the perforating process; efficient for framed or non-visible applications.

Materials
Round hole perforation is available in a wide range of materials to suit performance and aesthetic needs:

• Mild steel
• Stainless steel
• Galvanised steel
• Aluminium
• Brass
• Other alloys

Other resources / tools

• Open area calculation, sheet weight and unfolded sheet size calculators (tools for design and specification).
• Pattern catalogue with selections of round hole patterns for technical and aesthetic evaluation.

Technical specifications

• Hole type: Round holes (R).
• Minimum hole size available: from 0.3 mm.
• Common pitch/arrangements: Triangular (T, 60° staggered), Staggered (Z), Diagonal (M, 45°), Rectangular/Straight (U).
• Pattern edge options: Closed end, Semi-closed end, Open end.
• Typical applications: Filtration, sorting, airflow, acoustic absorption, façade and architectural infill, safety and protection panels.
• Materials available: Mild steel, Stainless steel, Galvanised steel, Aluminium, Brass, other alloys.