Cutting and Folding Aluminium Sheets
Aluminium sheet is only as good as the cut and the fold. Get either wrong and even the right thickness and the right alloy won't save the finished part. Whether you're cutting a sheet down for a weekend project or fabricating flashings by the hundred, the process comes down to two things: the tools you're using, and the thickness you're working with.
This guide covers both, for DIY and commercial projects, along with the equipment we use in-house to cut and fold aluminium sheet to size.
Victoria only. Sheet cutting and folding is available exclusively through our Victorian branch.
Cutting and folding sheet aluminium for DIY projects.
For small-scale jobs, aluminium sheet 3mm or thinner is manageable without industrial equipment. Heavy-duty scissors and alligator shears will cut most DIY-gauge sheet cleanly, and a basic sheet metal folder handles simple bends without distorting the material.
This range covers most home and small-repair projects: cladding trim, small brackets, signage, and patch repairs. Past 3mm, hand tools start to struggle and the finish quality drops off, which is usually the point where it's worth having it cut professionally rather than pushing hand tools past what they're built for.
Heavy-duty scissors
Clean cuts on thin DIY-gauge sheet for trim and small parts.
Alligator shears
More leverage for longer or slightly heavier cuts up to about 3mm.
Sheet metal folder
Simple bends without distorting the material.
Cutting and folding sheet aluminium for commercial projects.
Industrial and trade projects need machinery built for volume and consistency, not just capability.
A metal guillotine is the best option for sheets exceeding 1.2mm thickness, giving a straight, repeatable cut at speed across full sheets. It's what we use for anything moving beyond hand-tool territory, and it's the difference between cutting one bracket and cutting a hundred to the same tolerance.
| Machine | Sheet length | Thickness range | Best for |
|---|---|---|---|
| Guillotine | Up to 3.6m | 1.2mm–6mm | Straight, high-volume cuts across full sheets |
| Brake press | Up to 3.6m | 1.2mm–3mm | Top hat folds, angles, and Z-shape flashings |
The guillotine and brake press aren't interchangeable. A guillotine will cut heavier gauge sheet than a brake press can fold, so a job that needs both a cut and a fold on 4mm or 6mm material typically needs two separate processes. Worth raising with your fabricator at quoting stage, not partway through the job.
Choosing the right aluminium sheet thickness and size.
Getting the thickness right before you order saves a reorder and a delay later. Aluminium sheet in Australia is specified in millimetres, and the common ranges are:
0.5mm–1.2mm
Lightweight cladding, signage, and small DIY projects.
1.2mm–3mm
The working range for most custom fabrication, including brackets, enclosures, splashbacks, and folded trim.
3mm–6mm
Heavier gauge for structural components and base plates that need to hold their shape unsupported.
Stock sheet is generally supplied up to 3.6 metres, matching the maximum capacity of the guillotine and brake press above. Within that, you can order a full stock sheet, an aluminium plate cut to size for your exact dimensions, or an offcut for smaller jobs. Cut-to-size is usually the more cost-effective option once wastage is factored in, and it arrives ready to fold rather than needing a second cutting step on site.
Frequently Asked Questions.
What thickness of aluminium sheet can I cut with hand tools?
Up to about 3mm. Past that, hand tools lose finish quality and it's worth having it guillotine-cut.
What's the maximum sheet size you can cut or fold?
Both our guillotine and brake press handle sheet up to 3.6 metres. Longer runs need to be split or joined, which is worth flagging at the quote stage.
Can I get a custom cut aluminium sheet to my own dimensions?
Yes. Most trade orders are cut to size rather than supplied as standard stock sheets.
Does a thicker sheet always mean a stronger finished part?
Not on its own. Thickness matters, but so does the alloy and the fold geometry. A well-folded 2mm section can outperform a flat, unsupported 4mm sheet in the same application.
Get your aluminium sheet cut and folded to size.
Sheet cutting and folding is only available through our Victorian branch. Whatever the project, our team can cut and fold aluminium sheet to your specification. Get in touch with the Victorian team on (03) 9238 3888 to talk through thickness, size, and finish, or see our full range of aluminium extrusion profiles if your project needs more than flat sheet.