Round Hole Perforated Aluminium Sheet

Twelve Hole Sizes from 1.3mm to 40mm

The round-hole range spans a wider selection of diameters than any other perforation pattern in the catalogue. At the fine end, the 1.3mm hole produces a surface that reads as almost solid from a few metres away — the perforations are visible up close but blend into a uniform texture at normal viewing distances. This scale suits acoustic panels, speaker grilles, fine ventilation, and any application where the sheet needs to look like a finished surface rather than a perforated one.

In the mid-range, the 6.3mm to 15mm diameters offer a balance between visual openness and material presence. The individual holes are clearly visible and the pattern becomes a design element in its own right. These sizes are the workhorse of the range — radiator covers, cabinet ventilation, equipment enclosures, balustrade infill panels, and general screening where the perforated pattern needs to be seen but not dominate.

At the large end, the 19mm to 40mm holes produce a boldly perforated surface where the holes are the dominant visual feature. These are suited to external screening, large-format cladding, and applications where maximum airflow or light transmission is needed through a clearly open surface. The 40mm hole at 50% open area is the most open configuration in the entire round-hole range, removing half the sheet’s material while the remaining bridges maintain structural continuity.

Staggered and Square Pitch: Choosing the Right Layout

The choice between staggered and square pitch is one of the most frequently asked questions in perforated sheet selection, and the answer depends on whether the priority is open area, structural behaviour, visual appearance, or fixing practicality.

Staggered pitch (sometimes called triangular or 60° offset) packs holes more efficiently by offsetting alternate rows. This achieves a higher open area for any given hole diameter and pitch distance, which makes staggered pitch the better choice where ventilation, acoustic transparency, or light transmission needs to be maximised. The offset arrangement also distributes stress more uniformly across the sheet, reducing the likelihood of localised weak lines between rows.

Square pitch aligns holes in straight rows in both directions, creating a clean grid pattern. The open area is lower than staggered pitch at the same hole size and spacing, but the straight rows leave wider continuous strips of solid material between perforation lines. This can be an advantage where the sheet needs to be folded along a line, fixed with a row of fasteners, or cut to a dimension that avoids half-holes at the edge. The grid pattern also produces a more ordered, formal appearance that some specifications prefer for visible panels.

Across the Gooding Aluminium round-hole range, open areas span from 12% (square pitch, small holes, tight spacing) to 50% (staggered pitch, larger holes, wider spacing). This breadth means the right combination of hole size, pitch type, and open area can be selected to match almost any ventilation, screening, or acoustic requirement.

Fast Dispatch for Round Hole Perforated Sheets

Orders are normally dispatched within 2–5 working days and delivered via an overnight nationwide service. For projects requiring sheets made to non-standard dimensions, supplied with plain border margins, or finished with a polyester powder coat or anodised surface, Gooding Aluminium’s processing and finishing services can accommodate these requirements within a short lead time.

Free material samples are available for all sheets in the round hole range. Samples are posted first class and usually arrive within a couple of days, providing the opportunity to select the most suitable pattern. With twelve hole diameters and multiple open area configurations available, requesting samples of the two or three most likely options is the most reliable way to confirm the right specification for a project.