Description

The GA 1208 is an aluminium Z-section general purpose trim with an 8.6mm inside step width (I/S Width). The Z cross-section has two parallel flanges pointing in opposite directions, connected by a web whose width creates a deliberate offset — or step — between the two flange planes. One flange fixes to or bears against a structure at one surface level; the web bridges the step; and the opposing flange sits flush against a surface or panel face at a different level, 8.6mm away.

This offset geometry is unique among GA’s profile range. Unlike an angle (which creates a 90° corner), a channel (which contains material in a U-slot), an H-section (which joins two panels side by side), or a Y-section (which grips a panel at a perpendicular junction) — the Z-section creates a controlled, repeatable step between two parallel faces. The 8.6mm I/S Width is sized for the finer end of this step range: panel overlaps, slim-rebate retention details, and surface transitions where the offset between two adjacent faces is small but needs to be clean and precise.

Available from stock in mill (untreated) or natural anodised finish in 4-metre lengths. Powder coat and cut lengths available to order.

Notes: Jig marks, up to 50mm in from each end (often less than this), can be apparent on anodised items. These marks can be cut away before fixing.

Shade variations can occur with anodised surfaces due to the reactive nature of this finishing process.

Health and Safety

(Health and Safety doc. (1).pdf, 240 Kb) [View Document]

Install

(Profiles and Extrusions Install (5).pdf, 238 Kb) [View Document]

Maint.

(Maintenance of Aluminium Surfaces (1).pdf, 232 Kb) [View Document]

Tech Data

(Tech info extrusions (4).pdf, 397 Kb) [View Document]

Test Data

(Test – Extrusion Resistance to Surface Marking.pdf, 227 Kb) [View Document]

GA 1208 Aluminium Z-Section Trim - 8.6mm I/S Width

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Product Code: Categories Aluminium Profiles & Extrusions, Aluminium Z-Shape Product Type: Aluminium Z-Section

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Specifications

Product Code: GA 1208 (Mill) / GA 1208s (Natural Anodised)

I/S Width (Step Width): 8.6mm

Profile Function: Stepped offset Z-section: creates a controlled step between two parallel planes; one flange at the near plane, web bridges the offset, opposing flange at the far plane (8.6mm set back)

Typical Step Range: Suited to panel overlaps, rebates, and surface transitions with an offset of approximately 6–9mm — refer to the dimensional drawing for precise flange dimensions and tolerances

Profile Category: Aluminium Z-Section — Stepped Offset Trim

Material: Grade 6063 Aluminium Alloy

Standards: BS EN 755, BS EN 515, BS EN 573

Anodising Standard: BS EN ISO 7599

Powder Coating Standard: BS 6496 (1984) — available to order, please contact Sales

Length: 4 metres (4000mm) standard stock length

Available Finishes: Mill (Untreated) or Natural Anodised

Finish Notes: Anodised product codes carry an ‘s’ suffix (e.g. GA 1208s). Jig marks within 50mm of each end are standard and can be trimmed during final fitting. Shade variations may occur between batches.

Surface Marking Test: Independent testing (Ceram / Lucideon): anodised surface achieved up to 4× greater abrasion resistance than mill finish

Key Benefits

The Only Profile That Creates a Controlled Step in a Single Section: Every other profile in GA’s range works within a single plane — connecting, containing, capping, or meeting surfaces at the same level. The Z-section is the sole exception: its geometry inherently creates a precise, repeatable offset between two parallel planes. For the specific installation situations that require this — overlapping panels, stepped surface transitions, rebated retention details — it is the only standard profile that does the job without fabrication or additional components.

6mm Step for Slim-Tolerance Overlap & Rebate Applications: The 8.6mm inside step accommodates the thinner end of the overlap and rebate range: panel faces set back ~8mm from an adjacent face, thin back boards retained in a rebated frame, or lightweight panel systems where the step between abutting faces is small but must be covered precisely. The tight step keeps the trim slim and unobtrusive in installations where a larger-step Z-section would be visually disproportionate.

Both Flanges Provide Independent Fixing or Bearing Surfaces: The two flanges of the Z-section can each be used independently for fixing or bearing — one screwed or bonded to a structure, the other bearing against a panel face or rebate shoulder. This independence of the two fixing planes, separated by the 8.6mm web, is what makes the Z-section useful for overlapping connections and stepped transitions where two surfaces at different levels need to be linked by a single, continuous trim.

Anodised Surface Tested to Resist Everyday Marking: For a step trim that bridges two visible surfaces, surface appearance matters on both flanges. Ceram Building Technology (now Lucideon) tested anodised aluminium extrusions under abrasive conditions and confirmed that the anodised surface withstands up to four times as many passes before showing damage compared with mill finish. Specifying the anodised GA 1208s ensures the trim maintains its appearance on both visible faces in high-contact locations.

Corrosion Resistant Across Interior and Sheltered Environments: Alloy grade 6063 benefits from being anodised which thickens aluminium’s natural oxide layer providing additional corrosion resistance in humid, damp, and chemically exposed environments. The anodised GA 1208 can be used in kitchens, wet areas, external soffits under cover, and other environments where a steel or painted-steel step trim would corrode, blister, or require periodic re-coating.

Applications

Slim Panel Overlap Joints in Display & Exhibition Systems: Display and exhibition panel systems often use thin composite boards or lightweight sheet materials that are stepped or overlapped at their joints to create a positive, weatherboard-style lap detail. The GA 1208’s 8.6mm step covers the overlap between two panels set back at approximately 6–9mm from each other, providing a clean metal trim at each joint line that holds the panels in place and presents a neat, consistent detail along the panel run.

Slim-Rebate Back Panel Retention in Furniture & Cabinetry: Cabinet and furniture constructions often feature a thin back panel retained in a rebated groove cut into the carcass side. Where this rebate is around 8–9mm deep, the GA 1208 provides an aluminium retention bead that sits in the rebate, one flange bearing against the rebate shoulder and the other overlapping the back panel face — holding the panel in position without screws through the panel face.

Panel Face Set-Back Reveals in Shopfitting & Interior Fit-Out: In shopfitting and commercial interior fit-out, panels are sometimes deliberately set back from an adjacent face to create a reveal or recess detail at a junction. Where this set-back is approximately 8–9mm, the GA 1208 covers the step between the two face planes with a continuous aluminium trim, providing a defined metal reveal line that is more durable and visually precise than a painted or filled step.

Surface-to-Surface Step Transitions in Wall Linings: Where two sections of wall lining are installed at different face-plane depths — for instance where an insulated board system steps back from a non-insulated section — the GA 1208 bridges the step between the two face levels with an aluminium cover trim, providing a clean transition line without exposed board edges or the need for bespoke angle or filler pieces at the step.