If you’ve ever stepped onto a construction site, picked up a neatly cut window frame, or spotted a sleek, long-lasting solar panel mount, chances are you’ve interacted with profile aluminum. As a supplier who’s spent the last 12 years sourcing, cutting, and selling profile aluminum to small contractors, industrial manufacturers, and hobbyists alike, one question I get asked more than any other is: “What’s the density of profile aluminum?” It seems like a simple query, but the answer isn’t just a number—it’s a detail that impacts everything from shipping costs to structural load capacity, and it’s one I’ve learned to break down for customers who don’t just need a stat, but need to know why it matters for their project. Profile Aluminium
Let’s start with the basics, because that’s where I always begin when explaining this to a new customer. Density is, at its core, mass per unit of volume—usually measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³) in the metric units we use daily in our industry. For profile aluminum, the standard density you’ll see referenced in textbooks and material data sheets is 2.7 g/cm³, which translates to 2,700 kg/m³. But here’s the thing: that number isn’t one-size-fits-all. As a supplier, I’ve learned that most customers don’t realize profile aluminum isn’t a single, uniform metal—it’s an alloy, and different alloys have slightly different densities, even if they use the same base aluminum.
Let’s talk about the most common alloys we supply, because that’s what our customers actually work with. The alloy 6061 is by far our top-seller—used for everything from structural framing and machine parts to bicycle components and marine applications. The density of 6061 profile aluminum is almost exactly the standard 2.7 g/cm³, a tiny 0.5% shift from pure aluminum, which makes sense because it’s only mixed with small amounts of magnesium and silicon (the key alloying elements for 6061). The second most popular alloy is 6063, often used for extrusions that need a smooth, anodized finish—think window frames, curtain walls, and decorative trim. 6063 has even fewer alloying elements than 6061, so its density is almost identical at 2.702 g/cm³, a difference so small it rarely affects day-to-day calculations. The only time we see a meaningful density change is with heavier alloys like 2024, which uses copper as the main alloying element and has a density of around 2.78 g/cm³—about 3% denser than 6061. We stock 2024 for aerospace and high-stress industrial parts, but it’s not a go-to for most general projects, so we usually only mention it when a customer specifies they need it.
Now, why does this density number matter? This is where I pull out real examples from our customers, because generic explanations don’t stick. Last year, we worked with a small construction company that was bidding on a 50-unit apartment building’s window framing. Their initial design used 6063 profile aluminum, and they calculated their material weight based on pure aluminum’s density (2.7 g/cm³) and thought they’d need 12 metric tons of material. But when we ran the numbers for the actual density of 6063, they realized they only needed 11.9 tons—a tiny difference, but for a $2 million project, that’s thousands of dollars saved on material costs and shipping. Another customer, a robotics manufacturer, was building a custom gantry system that needed to be light enough to move quickly but strong enough to support heavy payloads. They chose 6061 profile aluminum, and when they calculated the load capacity, they used the correct density to determine how much the frame itself would contribute to the total weight the motor would need to move. If they’d used pure aluminum’s density, they would have overestimated the frame weight by 5%—enough to make them order a more powerful (and more expensive) motor than they actually needed.
Wait, but what about extrusions? That’s another question I get all the time, because profile aluminum is almost always extruded, not cast. Extrusion is the process of pushing heated aluminum alloy through a die to create a specific cross-sectional shape—think T-slots, square tubes, or custom profiles for conveyor systems. Does the extrusion process change density? From what we’ve measured here in our warehouse, no. We regularly take samples of the same profile, weigh a 1-meter length, and calculate its linear density (usually given in kg/m) by dividing the mass by the length. That linear density lines up almost exactly with what we calculate using the profile’s cross-sectional area, multiplied by the alloy’s density. For example, a 6061 T-slot profile with a cross-sectional area of 5 cm² has a linear density of 5 cm² * 2.7 g/cm³ = 13.5 g/cm, or 0.0135 kg/cm, which is 1.35 kg per meter. We’ve checked this with a scale hundreds of times, and the numbers always match—so extrusion doesn’t alter the density, as long as the alloy is consistent.
There’s a common myth I hear a lot from hobbyists who work with aluminum: “Anodized aluminum has a different density.” Let me set the record straight on that, because it’s a misconception that trips up a lot of people. Anodizing is a surface treatment that creates a thin layer of aluminum oxide (usually 10 to 25 microns thick) on the profile’s surface. That layer is porous, and often sealed with a dye or a clear coat, but it’s less than 0.003% of the total volume of the profile. Even if you add a 25-micron thick anodized layer, the total density of the profile barely changes—less than 0.01%. For all practical purposes, anodized profile aluminum has the same density as the base alloy. I always tell hobbyists that if they’re calculating weights for a small project, they can ignore the anodized layer entirely; it doesn’t make a noticeable difference.
Another point that comes up with customers is how density relates to aluminum’s biggest advantage over other metals: strength-to-weight ratio. Steel, for comparison, has a density of around 7.85 g/cm³—nearly three times denser than profile aluminum. But aluminum’s tensile strength (how much stress it can take before breaking) is about a third of mild steel. That means if you need a light, strong frame, profile aluminum is the way to go. For example, a 1-meter steel T-slot frame would be almost three times heavier than an identical 6061 aluminum frame, even if both have the same load capacity. This is why so many automotive and aerospace companies switch to aluminum profile parts to reduce overall vehicle weight, improving fuel efficiency or range. As a supplier, I often explain this trade-off to customers who are choosing between aluminum and steel: density isn’t just about weight, it’s about matching the material to your project’s priorities.
Now, let’s talk about how density is used in day-to-day work with profile aluminum. When we cut profiles to custom lengths for customers, we use density to calculate how much a batch of material will weigh, which helps us quote shipping costs accurately. If a customer orders 100 linear meters of 6061 square profile with a 2 cm side and 0.2 cm wall thickness, we calculate the cross-sectional area first: area of the outer square minus the inner hollow area. That’s (2 cm * 2 cm) – (1.6 cm * 1.6 cm) = 4 cm² – 2.56 cm² = 1.44 cm². Multiply that by 2.7 g/cm³ to get linear density: 1.44 * 2.7 = 3.888 g/cm, or 3.888 kg per meter. 100 meters would be 388.8 kg, so we can quote shipping for that exact weight, no guesswork. That’s why we always make sure our data sheets have precise density numbers for each alloy we stock—being accurate here means we don’t underquote shipping (which hurts us) or overquote (which makes customers go to a competitor).
I’ve also run into cases where a customer’s project requires a custom profile, and they need to adjust the cross-sectional shape to stay within a weight limit. For example, a customer making a set of aluminum shelving units that need to hold 50 kg per shelf but can’t weigh more than 20 kg each. By using the correct density of 6061, we can adjust the T-slot profile’s wall thickness: if we make the wall 0.3 cm instead of 0.2 cm, the linear density goes up, but we can add reinforcing ribs to the profile to keep the strength high, while staying under the total weight limit. All of that relies on knowing the density of the aluminum they’re using—without that number, we’d be guessing and risking a part that’s too heavy or too weak.
Of course, there are edge cases where density might differ slightly, even within the same alloy. For example, if a profile aluminum part has undergone heat treatment (like T6 temper for 6061, which makes it stronger), does that change density? From the data we’ve reviewed, the heat treatment process (solution heat treating and aging) doesn’t alter the atomic structure enough to change density. The only time we see a meaningful shift is if the profile has porosity from a bad extrusion run—tiny air pockets in the metal that lower the density slightly. That’s why we do quality checks on every batch we receive: we test sample pieces for density to make sure they meet industry standards, so our customers don’t end up with material that’s lighter than it should be, and therefore weaker.
At the end of the day, the density of profile aluminum is a simple number, but it’s one that impacts every part of working with this versatile material. Whether you’re a contractor calculating material costs, an engineer designing a custom machine, or a hobbyist building a backyard project, knowing that number helps you make better decisions. As a supplier, I pride myself on being transparent about these details—no generic answers, just real numbers and real-world examples that show our customers how to use profile aluminum effectively.
If you’re working on a project that requires profile aluminum and you need precise density data, custom cut lengths, or help choosing the right alloy for your needs, I’m here to help. We stock a full range of standard profiles and alloys, and we can source custom extrusions for specialized projects. Reach out to our team to discuss your requirements, and we’ll provide you with accurate, tailored information to keep your project on track.
Profile Aluminium References
- Aluminum Association. (2023). Aluminum Design Manual: Properties and Selection of Aluminum Alloys. Aluminum Association Inc.
- ASM International. (2021). Properties of Aluminum Alloys. ASM Handbook, Volume 2: Properties and Selection: Nonferrous Alloys and Special-Purpose Materials.
- Extrusion Council. (2022). Extruded Aluminum Profiles: Material Properties and Manufacturing Standards. The Extrusion Council.
Hefei Nuozun Aluminum Industry Co., Ltd.
As one of the most professional profile aluminium manufacturers and suppliers in China, we also support customized service. Please feel free to wholesale bulk premium profile aluminium made in China here from our factory. Welcome to contact us for pricelist.
Address: Nuozun Aluminum Industry, Sunwubian, Shitang, Heshun, Lishui Town, Nanhai District, Foshan City, Guangdong Province
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