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bsi. 9001:2015 Certified
Established in 1979
4.7 Star Google Rating
Free Samples Available
Premium UK Supplier
bsi. 9001:2015 Certified
Established in 1979
4.7 Star Google Rating
Free Samples Available
Premium UK Supplier
Square hole perforated aluminium sheet from Gooding Aluminium, available in hole sizes from 3mm to 35mm across square and diagonal pitch layouts. Square-hole perforation produces a geometric, grid-like surface where each aperture has four straight edges and four right-angled corners. This angular geometry gives square-hole sheets distinct functional advantages over round-hole equivalents: straight edges align naturally with panel edges and fixing lines, the angular corners improve drainage by preventing liquid from clinging to curved surfaces, and the grid pattern produces a more structured, formal visual character. Open areas range from 17% to 56% across the collection, with the diagonal pitch option — unique to this category — rotating the square holes 45° to create a diamond pattern that combines angular functionality with a more dynamic visual effect.
Sheets are normally dispatched within 2–5 working days on an overnight delivery service.
| Perforation Pattern | Square (four-sided) holes |
| Also Known As | Square punch perforated sheet, square perforated aluminium, diamond perforated sheet (diagonal pitch) |
| Pitch Layouts | Square (holes aligned with sheet edges) and Diagonal (holes rotated 45° to create diamond pattern) |
| Hole Sizes Available | 3.0mm, 6.3mm, 10.0mm, 12.7mm, 15.0mm, 19.0mm, 25.0mm, 35.0mm |
| Open Area Range | 17% to 56% |
| Sheet Size | 2000mm x 1000mm & 2500mmm x 1250mm & Custom Sizes |
| Material Thickness | 1.2mm, 2.0mm, 3.0mm |
| Material | Aluminium |
| Surface Finish | Mill (untreated) |
| Dispatch | 2–5 working days |
| Delivery | Overnight nationwide service |
| Custom Options | Bespoke sizing, plain borders, fixing holes, folded edges, anodised and powder coat finishes available — contact sales@goodingalum.com |
Sheets are normally dispatched within 2–5 working days. Delivery is via an overnight nationwide service.
Yes. All sheets in the square hole range can be supplied with a polyester powder coat finish applied after perforation. Finishes are available within a few days of order. Contact sales@goodingalum.com with your colour and finish requirements.
Normally, we can produce specially sized panels with plain borders, and fixing holes, if required, within a few days.
Square hole perforated aluminium sheet is a flat aluminium panel punched with four-sided, right-angled apertures arranged in a repeating pattern across the surface. The straight edges and sharp corners of each hole produce a more geometric, structured surface than round-hole perforation. Gooding Aluminium stocks square hole perforated sheet in hole sizes from 3mm to 35mm, available in both square pitch and diagonal pitch layouts.
Square pitch aligns the square holes parallel to the sheet edges, creating a straight grid pattern. Diagonal pitch rotates each hole 45° so that the corners point up and down, producing a diamond-shaped pattern across the sheet. Both layouts use the same square aperture, but the visual effect and structural behaviour differ. Diagonal pitch distributes stress more evenly across the sheet and produces a more visually active surface. Square pitch creates a calmer, more regimented pattern with the hole edges running parallel to the sheet edges — useful where the panel will be cut or fixed along straight lines.
The key differences are geometric. Square holes have four straight edges and four corners, while round holes have a continuous curved perimeter. This affects performance in three ways: square holes drain liquids more effectively because the angular corners prevent surface tension from holding liquid in the aperture; straight edges align naturally with sheet edges, cutting lines, and fixing positions; and the angular pattern produces a more structured, grid-like visual appearance. Round holes distribute stress more evenly and tend to be specified where fatigue resistance is the primary concern.
Six sizes are stocked: 3.0mm, 6.3mm, 10.0mm, 12.7mm, 15.0mm, 19.0mm, 25.0mm, and 35.0mm. Most sizes are available in both square and diagonal pitch, and in multiple open area configurations ranging from 17% to 56%. This allows the open area and visual density to be tuned for each application.
The square hole is the second most commonly specified perforation geometry after the round hole, and it occupies a distinct functional niche. Where round holes are chosen for their stress distribution, visual neutrality, and acoustic properties, square holes are chosen for their angular, grid-based geometry and the practical advantages that straight edges bring to structural and industrial applications.
The most significant of these advantages is alignment. Every edge of a square hole runs parallel or perpendicular to the sheet edges, which means the perforation pattern aligns naturally with cutting lines, fold lines, fixing positions, and adjacent panel edges. For fabricators working with perforated sheet that will be cut to size, folded into trays, or fixed with rows of fasteners, this alignment simplifies layout and reduces the risk of half-holes or misaligned patterns at panel edges.
The angular corners also improve drainage. Liquid sitting on a round-hole sheet can be held in the aperture by surface tension, because the curved perimeter creates a continuous meniscus. The sharp corners of a square hole break this meniscus, allowing liquid to drain through more readily. This makes square-hole perforation a preferred choice for filtration screens, drip trays, washdown environments, and any application where standing liquid on the sheet surface is undesirable.
The square hole range is available in two pitch orientations, and the choice between them changes both the visual character and the structural behaviour of the sheet.
In square pitch, the holes sit with their edges parallel to the sheet edges, forming a straight grid. The solid bridges between holes run in clean horizontal and vertical lines, producing a calm, ordered surface that reads as a structured panel rather than a perforated one. This layout is well suited to applications where the sheet will be framed, bordered, or installed alongside other straight-edged components — the grid pattern sits quietly within a rectilinear context.
In diagonal pitch, the same square holes are rotated 45° so that their corners point up and down, creating a repeating diamond pattern across the sheet. This rotation changes the visual rhythm substantially — the surface feels more dynamic and active than the static grid of square pitch. Structurally, diagonal pitch also distributes stress differently: the bridge material runs at 45° to the sheet edges rather than parallel, which can improve resistance to bending along the sheet’s primary axes. This makes diagonal pitch a good option where the sheet will span an unsupported opening and rigidity matters.
The diagonal pitch option is unique to the square hole category. Round holes, hexagonal holes, and slotted perforations do not offer a rotated pitch variant in the Gooding Aluminium range. For specifiers who need a diamond-pattern perforated panel, this is the only category that provides it.
The square hole range spans from 3mm up to 35mm, and the visual and functional character of the sheet changes significantly across this spectrum.
At the fine end, the 3mm, 6.3mm and 10.0mm holes produce a tightly perforated surface where the individual apertures are small enough to read as texture rather than individual holes at normal viewing distances. These sizes suit fine screening, filtration, equipment enclosures, and machine guarding where small particles or fingers need to be kept out while airflow passes through.
In the mid-range, the 12.7mm, 15mm and 19mm sizes produce clearly visible square openings that make the perforation pattern a deliberate design element. These are widely used for balustrade infill panels, railing inserts, internal screening, and radiator covers where the angular grid pattern contributes to the visual identity of the installation.
At the large end, the 25mm and 35mm holes create a boldly open surface where more material has been removed than remains. The 35mm hole at 40% open area produces a sheet that reads as an open lattice — suited to external screening, large-format cladding, and applications where maximum airflow and a strong graphic presence are both required.
Open areas across the range span from 17% (tightest screening) to 56% (most open), giving specifiers a broad choice between visual opacity and throughput at every hole size.
Standard orders are dispatched within 2–5 working days and delivered via an overnight nationwide service. For projects requiring sheets produced to bespoke dimensions, supplied with plain border margins, or finished with a polyester powder coat 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 square hole range. Samples are posted first class and typically arrive within a couple of days, giving specifiers and purchasing teams the opportunity to compare square and diagonal pitch side by side, assess the hole scale against the intended application, and confirm the visual density of the chosen open area before committing to a full order.