If you’re in the market for aluminium grating, chances are you’ll need to cut it at some point to fit around support beams, along irregular project edges, or to size for custom safety applications. As someone who’s been an aluminium grating supplier for over 12 years, I’ve seen first-hand how cutting this material wrong can turn a seemingly simple job into a safety hazard, or worse, waste perfectly good grating that costs you time and money. I’ve watched DIYers mess up industrial-grade grating with a circular saw meant for wood, and I’ve also walked new contractors through the precise steps to get clean, straight cuts on site. Today, I’m breaking down exactly how to cut aluminium grating correctly, with tips I’ve picked up from jobs ranging from small walkways for backyard decks to heavy-duty industrial platforms for warehouses. Aluminium Grating
First, let’s start with why aluminium grating is different from other metals, and why cutting it requires a different approach than steel or iron. Aluminium is soft, lightweight, and more prone to bending or warping if you apply too much pressure or use the wrong tool. Unlike solid metal sheets, grating has an open, patterned structure—most commonly made with load-bearing bars running one direction, cross bars running the other, and spaces between them for traction or drainage. That open structure means it can flex easily, especially when you’re cutting it, so holding it securely is non-negotiable. I’ve had jobs where a technician didn’t clamp their grating down, and the piece shifted mid-cut, leaving a jagged, uneven edge that had to be tossed and the job delayed by two days.
Before you even pick up a tool, there are a few pre-cutting steps that will save you hours of frustration. The first is measuring correctly, which sounds obvious but is often where mistakes start. Mark your cut line clearly with a straight edge—an aluminum ruler works best, because a wooden one can flex and throw off your line—using a permanent marker that won’t smudge. If you’re cutting across the load-bearing bars (the long, thicker bars that give grating its strength), you’ll need to plan for the cut to be perpendicular to those bars. If you cut along the load-bearing bars, keep in mind that the cross bars will still need to be supported, so never cut a piece shorter than 12 inches without extra clamping, as it will flex too much.
Next, safety. Aluminium dust is fine and not something you want to breathe in, and the small metal shavings from cutting can be sharp enough to cut skin or damage equipment. I always make sure anyone on my site wearing safety glasses, a dust mask, and work gloves. If you’re working indoors, open a window or set up a fan to pull dust away from your face. Also, make sure your work area is clear of debris, and that your cutting tool is in good working order—blunt blades will tear at the aluminium instead of cutting through it cleanly, leading to extra work later.
Now, the tools. This is where I see most people go wrong. A lot of DIYers reach for a standard circular saw with a wood blade, thinking it’ll work for soft metal, but that will leave frayed edges and can even bind in the grating’s open slots. The best tools for cutting aluminium grating fall into two categories, depending on the scale of your project and how clean you want your cut.
For small jobs—cutting up to a few pieces of residential or light commercial aluminium grating, like for a patio drain or a small walkway—I recommend a jigsaw with a bi-metal blade designed for cutting non-ferrous metals. Bi-metal blades have high-speed steel teeth that can handle soft metals like aluminium, and for grating, you’ll want a blade with 18 to 24 teeth per inch (TPI). Higher TPI means smaller, sharper teeth that won’t tear the grating’s bars. I learned this the hard way early on, when I used a 10 TPI blade for a small job, and it took me twice as long to cut through, plus the edges were jagged enough that I had to grind them down. A 20 TPI blade is perfect for most residential grating. When using a jigsaw, set the speed to high—aluminium cuts best at fast speeds to avoid melting the metal, which can leave a sticky residue on your blade and the grating. Also, make sure the blade is installed correctly, with the teeth pointing down toward the material, not up.
For larger projects, or industrial-grade aluminium grating that’s thicker and heavier, a circular saw with an aluminium-specific blade is the way to go. These blades have carbide-tipped teeth that are harder than bi-metal, so they stay sharp longer through multiple cuts. Look for a blade with 60 to 80 TPI—again, more teeth mean cleaner cuts. I always tell my clients to avoid using a standard steel-cutting blade, as it will dull quickly and can cause the saw to kick back, which is a safety risk. If you don’t have a circular saw with an aluminium blade, another great option for heavy duty is an abrasive saw (also called a chop saw) with a aluminium cut-off wheel. Abrasive wheels are designed specifically for cutting non-ferrous metals, and they make quick work of thick grating. The downside is that they can create more heat, so you want to make sure you don’t apply too much pressure at once, which can warp the grating.
No matter what tool you use, holding the grating securely is the most important step to get a straight cut. Grating’s open structure makes it easy to shift, so never try to cut it just resting on a workbench without clamping it down. For small pieces, use at least two bar clamps on either side of your cut line. For larger pieces, add a third clamp at the end you’re cutting off, to keep the edge from lifting as the blade goes through. If you’re cutting on a site without a workbench, you can lay the grating across two sawhorses, but make sure the cut line is over a sawhorse so the piece you’re cutting off doesn’t hang in mid-air—hanging pieces will flex and bend, leading to a crooked cut. I’ve also seen people use c-clamps attached to a sturdy fence or metal frame, which works great for straight, consistent cuts on multiple pieces of grating.
Now, the actual cutting process. Let’s start with jigsaw cutting, since it’s more common for smaller on-site jobs. Once your grating is clamped down and your cut line is marked, line the jigsaw blade up with the start of your cut line. Turn the saw on before touching the blade to the grating—starting the saw first prevents the blade from catching on the metal. Once the blade is spinning at full speed, slowly feed it into the grating, following your line as closely as possible. Don’t force the saw; let the blade do the work. For grating, you’ll be cutting through both the load bars and the cross bars, so take it slow on the cross bars, which are thinner. If you feel the blade binding, stop, pull the saw back, and check if any metal shavings are clogging the blade slots. A quick wipe with a clean cloth will usually fix that.
For circular saw or chop saw cutting, the process is similar, but you’ll want to set the depth of your cut first. The blade should only go just deep enough to cut through the top layer of the load bars, not so deep that it scrapes the workbench or catches on the surface. Line the saw’s blade up with your cut line, lower the blade slowly until it lightly touches the grating, then turn the saw on. Apply steady, even pressure as you push the saw along the line—don’t lean too hard, as that can bend the blade or warp the grating. If you’re cutting long pieces, take short, slow passes to keep the cut straight.
Once you’ve made your cut, there’s one more step to make the piece safe and functional: de-burring. The cut edge of aluminium grating will have small, sharp burrs left from the cutting process. These burrs are not only a hazard for anyone handling the grating, but they can also catch on clothing or tools when you install it. To remove them, use a metal file (a flat, bastard file works well) or a wire brush attached to a drill. Run the file along the cut edge until it’s smooth to the touch. For industrial grating, you can also use a grinder with a fine-grit sanding disc to get a perfectly smooth edge, just make sure to wear a dust mask when doing this to avoid breathing in fine metal particles.
I want to add a few pro tips that I’ve picked up over the years, because they make a huge difference in the final result. First, if you’re cutting a lot of pieces, lubricating the blade will keep it sharp and reduce heat. You can use a light machine oil or even a spray cutting lubricant specifically for aluminium. This is especially helpful when using a chop saw, which creates more heat and can cause the metal to melt or the blade to wear out quickly. Second, if you need to make curved cuts—something that comes up for custom walkways or edging around pipes—a jigsaw is definitely the best tool for the job, as circular saws and chop saws can only make straight cuts. When making curved cuts, use a blade with even higher TPI (24 to 32) for smoother curves, and take your time to follow the curve line closely.
Another common mistake I see is people throwing away small offcuts. A lot of my clients don’t realize that 12-inch to 24-inch offcuts can still be used for smaller applications, like drain grates or support brackets, so if you have clean, intact pieces, hold onto them instead of wasting them.
Steel Grating Now, if you’re wondering which type of aluminium grating works best for your project, that’s what we’re here for. As an aluminium grating supplier, we carry all grades, from residential light-duty grating for decks and patios to heavy-duty industrial grating for loading docks and chemical plants. We also stock all the tools and accessories you might need, or if you’re not sure which steps work best for your specific project, our team is available to walk you through it, no matter how big or small the job. Whether you’re a contractor with a 1000-square-foot warehouse project or a homeowner putting in a custom backyard walkway, we can help you get the right grating, the right cuts, and the support you need to get the job done safely and on time. Don’t hesitate to reach out to our team to discuss your cutting needs, ask questions about the right tools for your project, or get a quote on high-quality aluminium grating that’s cut to your exact specifications.
- "Aluminium Grating Cutting: Best Practices for Precision and Safety", Metal Bulletin, 2022.
- "Non-Ferrous Metal Cutting Guide", American Iron and Steel Institute, 2021.
- "Hand and Power Tool Safety Standards for Construction", Occupational Safety and Health Administration (OSHA), 2023.
- "Bi-Metal vs. Carbide TPI Blades for Soft Metal Cutting", Tool and Manufacturing Engineers Handbook, 2020.
- "Industrial Grating Installation and Maintenance Guide", International Code Council (ICC), 2021.
Yantai United Steel Structure Co., Ltd.
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