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bsi. 9001:2015 Certified
Established in 1979
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Free Samples Available
Premium UK Supplier
bsi. 9001:2015 Certified
Established in 1979
4.7 Star Google Rating
Free Samples Available
Premium UK Supplier
Our aluminium Z-shape profiles are precision-extruded in grade 6063 alloy and stocked in two internal step widths — 8.6mm (GA 1208) and 9.5mm (GA 1209). The Z-shaped cross section, with its two parallel flanges offset by a central web, is designed specifically for situations where a stepped joint, an overlapping panel edge, or a transition between two surfaces at different heights needs to be neatly covered and finished. It is a specialist trim that solves problems no flat bar, angle, or channel can address on its own. Both sizes are available in mill (untreated) or natural anodised finish, stocked in standard 4-metre lengths, with next-day UK dispatch and a cutting service available on request.
Customers choose Gooding Aluminium for reliable stock availability, consistent material quality, and fast UK dispatch. We supply joiners, shopfitters, display manufacturers, partition installers, and general fabricators who need specialist Z-section profiles that are precisely dimensioned, available from stock, and delivered quickly to keep projects moving.
With two internal step widths available — 8.6mm and 9.5mm — this range covers the most commonly required Z-section dimensions for overlapping and stepped panel trim applications. The internal step width (I/S width) is the key dimension to match against your panel thickness or surface step depth. Click the illustrated product images for detailed dimensional drawings to confirm the correct profile for your application. Both profiles are available in mill or anodised finish and are ready for next-day dispatch.
| Alloy Grade | 6063 |
| Standards | BS EN 755 / BS EN 515 / BS EN 573 |
| Stock Length | 4 metres |
| I/S Widths Available | 8.6mm (GA 1208) | 9.5mm (GA 1209) |
| I/S Width Definition | Internal step width — the offset distance between the two flanges |
| Surface Finish Options | Mill (Untreated) or Natural Anodised |
| Anodising Standard | BS EN ISO 7599 |
| Powder Coating Standard | BS 6496 (1984) |
| Product Code Suffix | No suffix = Mill finish; 'S' suffix = Natural Anodised |
| Cutting Service | Available on request — contact the sales team |
| Jig Marks (Anodised) | May appear up to 50mm from each end; cut away before fixing |
Below are answers to common questions about our aluminium Z-shape profiles, including what I/S width means, how to choose between the two sizes, surface finishes, and ordering and delivery details.
Aluminium Z-shape profiles — also called Z-section trims, Z-bar profiles, or offset trims — have a cross section that resembles the letter Z, with two parallel flanges offset from each other by a central connecting web. This stepped geometry makes Z-profiles the practical solution wherever two surfaces or panels need to be connected at a stepped level difference, or where an overlapping joint between two panels needs to be covered and finished neatly. Common applications include cover and flashing trims at panel step-joints, overlapping edge trims where one panel sits proud of another, transition details between surfaces at different heights or depths, and stepped rebate trims in joinery and fit-out work. The Z-shape profile is a specialist trim that solves problems that neither a flat bar nor a standard channel can address.
I/S Width stands for internal step width — the critical dimension on a Z-section profile that defines the offset distance between the inner faces of the two parallel flanges, measured across the step. This is the dimension that determines how much of a surface height difference or panel overlap the Z-profile can accommodate. The GA 1208 has an 8.6mm I/S width and the GA 1209 has a 9.5mm I/S width. When selecting a Z-profile, the I/S width should closely match the thickness of the material being overlapped, or the depth of the step between the two surfaces being bridged.
The two Z-shape profiles differ only in their internal step width: GA 1208 has an 8.6mm I/S width and GA 1209 has a 9.5mm I/S width. The correct choice depends on the thickness of the panel edge being overlapped or the depth of the step being bridged. The dimensional drawings on each product page should be consulted alongside your material thickness to confirm which profile gives the right fit. If you are unsure which size suits your application, contact the sales team at sales@goodingalum.com for advice.
All Z-shape profiles are extruded in grade 6063 aluminium alloy, to specifications BS EN 755, BS EN 515, and BS EN 573. Grade 6063 is the standard alloy for extruded profiles, providing a good surface finish, strong corrosion resistance, excellent weldability, and reliable suitability for anodising. It performs well in both interior and exterior environments.
Both Z-shape profiles are stocked in standard 4-metre lengths. If you require sections cut to a shorter length, a cutting service is available — contact the sales team at sales@goodingalum.com with your required dimensions and quantities for pricing and lead times.
Yes. Both Z-shape profiles are available in mill (untreated) or natural anodised finish. Natural anodised profiles carry the 'S' suffix on their product code. Anodising is carried out to BS EN ISO 7599 and produces a harder, more uniform surface that is more resistant to marking and corrosion than mill finish. Please note that shade variation can occur between anodised batches due to the reactive nature of the process, and jig or clamp marks up to 50mm from each end are normal on anodised items — these should be cut away before fixing where appearance matters.
Mill finish (untreated) is the aluminium in its extruded state, without any surface treatment. It is well suited to applications where the profile will be powder coated, painted, or concealed in the final installation. Natural anodised finish creates a hard, transparent oxide layer on the surface, giving a clean, uniform matt silver appearance with improved resistance to marking and corrosion. Anodised Z-shape profiles are the right choice for visible installations where the aluminium will be on show as part of the finished detail.
Yes. Grade 6063 aluminium has good natural corrosion resistance and is suitable for both indoor and outdoor use. For external applications where long-term surface appearance is important, natural anodised finish offers better protection than mill finish. Powder coating to any colour within the Classic RAL Colour Management System is available on request for additional weather resistance or colour matching.
Yes. A cutting service is available on both Z-shape profiles. Contact the sales team at sales@goodingalum.com with your required lengths and quantities for a quote. Powder coating is also available on request for mill finish items.
Yes. Free samples are available to allow you to check the I/S width, overall dimensions, and surface finish against your application before placing a full order. Use the 'Free Sample' button on the relevant product page, or contact the sales team to request your sample.
The aluminium Z-section profile exists to solve a specific finishing challenge: how to cover a stepped joint or overlapping panel edge neatly when flat bar is too thin, a channel would need cutting down, or an angle would leave an unsightly gap. The Z-shape does it in a single extrusion — one flange sits on the face of one panel or surface, the web spans the step, and the second flange covers the edge or face of the adjacent material at the lower level. The result is a clean, continuous trim that conceals the joint and bridges the step without additional cover pieces or awkward mitres. Gooding Aluminium stocks two internal step widths — 8.6mm and 9.5mm — in grade 6063 alloy in both mill and natural anodised finish, giving fabricators and installers a directly available, precisely made solution for these common installation details.
Z-shape profiles are a regular specification in joinery, shopfitting, and interior fit-out work, where panel-to-panel or panel-to-wall stepped transitions need a tidy, professional finish. In retail environments they are often used to create clean step details at the junction of display panels and backing boards. In joinery applications they cover rebate joints, step trims on layered panel assemblies, and overlapping cover details on built-in furniture and cabinetwork. In general fit-out work they serve as a practical and visually clean way to handle the stepped height differences that occur when different materials or thicknesses of board are used alongside each other. The two I/S widths — 8.6mm and 9.5mm — are sized to suit the most common panel thicknesses encountered in these settings.
Both Z-shape profiles are available in mill (untreated) or natural anodised finish to suit the requirements of the application. Mill finish is the practical choice for profiles that will be powder coated, painted, or concealed within the installation. Natural anodised finish, produced to BS EN ISO 7599, provides a harder, more durable surface with a clean matt silver appearance that is well suited to exposed trim work where the aluminium itself is part of the finished detail. Powder coating to any colour in the Classic RAL Colour Management System is available on request for mill finish items where colour matching to an existing scheme is required.
Both Z-shape profile sizes are held in stock in 4-metre lengths and dispatched on a free overnight UK delivery service, with in-stock items shipping by the next working day. A click-and-collect service is available from Gooding Aluminium’s London trade counter with no minimum spend. For cut-to-length requirements, a cutting service is available to reduce on-site waste and simplify handling — contact the sales team at sales@goodingalum.com with your dimensions and quantities for pricing and lead times.
