Aluminum 7075-T6 Flat Bar Weight
Mass per metre and per foot for aluminum 7075-t6 flat bar at 2,810 kg/m³ (ASTM B211 / B209 (T6 temper)). Every figure is for the section as drawn. A 6 m length of this size weighs 5.1 kg (11.3 lb per 20 ft).
At the reference dimensions (w = 50 mm, t = 6 mm) this section has a cross-sectional area of 300.0 mm², giving 0.843 kg/m (0.566 lb/ft). Against carbon steel's 7,850 kg/m³ that is -64.2 % — the same section in steel would be 2.355 kg/m.
Flat Bar — formula and derivation
Area of a flat bar
A = w · t
A = w × t, where w is width and t is thickness
Worked through with the default dimensions:
A = w × tA = 50 × 6A = 300.0 mm²
- w
- Width
- t
- Thickness
Weight follows from the area with no further geometry: m = A × 10⁻⁶ × ρ, where A is in mm², ρ in kg/m³ and m in kg/m. At 2,810 kg/m³ that is 0.8430 kg/m for the reference size above.
AL 7075 flat bar — size series
| Width | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.101 kg/m · 0.068 lb/ft | 0.135 kg/m · 0.091 lb/ft | 0.169 kg/m · 0.113 lb/ft | 0.202 kg/m · 0.136 lb/ft | 0.270 kg/m · 0.181 lb/ft | 0.337 kg/m · 0.227 lb/ft | 0.405 kg/m · 0.272 lb/ft | 0.540 kg/m · 0.363 lb/ft | 0.674 kg/m · 0.453 lb/ft |
| 16 mm | 0.135 kg/m · 0.091 lb/ft | 0.180 kg/m · 0.121 lb/ft | 0.225 kg/m · 0.151 lb/ft | 0.270 kg/m · 0.181 lb/ft | 0.360 kg/m · 0.242 lb/ft | 0.450 kg/m · 0.302 lb/ft | 0.540 kg/m · 0.363 lb/ft | 0.719 kg/m · 0.483 lb/ft | 0.899 kg/m · 0.604 lb/ft |
| 20 mm | 0.169 kg/m · 0.113 lb/ft | 0.225 kg/m · 0.151 lb/ft | 0.281 kg/m · 0.189 lb/ft | 0.337 kg/m · 0.227 lb/ft | 0.450 kg/m · 0.302 lb/ft | 0.562 kg/m · 0.378 lb/ft | 0.674 kg/m · 0.453 lb/ft | 0.899 kg/m · 0.604 lb/ft | 1.124 kg/m · 0.755 lb/ft |
| 25 mm | 0.211 kg/m · 0.142 lb/ft | 0.281 kg/m · 0.189 lb/ft | 0.351 kg/m · 0.236 lb/ft | 0.421 kg/m · 0.283 lb/ft | 0.562 kg/m · 0.378 lb/ft | 0.703 kg/m · 0.472 lb/ft | 0.843 kg/m · 0.566 lb/ft | 1.124 kg/m · 0.755 lb/ft | 1.405 kg/m · 0.944 lb/ft |
| 30 mm | 0.253 kg/m · 0.170 lb/ft | 0.337 kg/m · 0.227 lb/ft | 0.421 kg/m · 0.283 lb/ft | 0.506 kg/m · 0.340 lb/ft | 0.674 kg/m · 0.453 lb/ft | 0.843 kg/m · 0.566 lb/ft | 1.012 kg/m · 0.680 lb/ft | 1.349 kg/m · 0.906 lb/ft | 1.686 kg/m · 1.133 lb/ft |
| 40 mm | 0.337 kg/m · 0.227 lb/ft | 0.450 kg/m · 0.302 lb/ft | 0.562 kg/m · 0.378 lb/ft | 0.674 kg/m · 0.453 lb/ft | 0.899 kg/m · 0.604 lb/ft | 1.124 kg/m · 0.755 lb/ft | 1.349 kg/m · 0.906 lb/ft | 1.798 kg/m · 1.208 lb/ft | 2.248 kg/m · 1.511 lb/ft |
| 50 mm | 0.421 kg/m · 0.283 lb/ft | 0.562 kg/m · 0.378 lb/ft | 0.703 kg/m · 0.472 lb/ft | 0.843 kg/m · 0.566 lb/ft | 1.124 kg/m · 0.755 lb/ft | 1.405 kg/m · 0.944 lb/ft | 1.686 kg/m · 1.133 lb/ft | 2.248 kg/m · 1.511 lb/ft | 2.810 kg/m · 1.888 lb/ft |
| 60 mm | 0.506 kg/m · 0.340 lb/ft | 0.674 kg/m · 0.453 lb/ft | 0.843 kg/m · 0.566 lb/ft | 1.012 kg/m · 0.680 lb/ft | 1.349 kg/m · 0.906 lb/ft | 1.686 kg/m · 1.133 lb/ft | 2.023 kg/m · 1.360 lb/ft | 2.698 kg/m · 1.813 lb/ft | 3.372 kg/m · 2.266 lb/ft |
| 80 mm | 0.674 kg/m · 0.453 lb/ft | 0.899 kg/m · 0.604 lb/ft | 1.124 kg/m · 0.755 lb/ft | 1.349 kg/m · 0.906 lb/ft | 1.798 kg/m · 1.208 lb/ft | 2.248 kg/m · 1.511 lb/ft | 2.698 kg/m · 1.813 lb/ft | 3.597 kg/m · 2.417 lb/ft | 4.496 kg/m · 3.021 lb/ft |
| 100 mm | 0.843 kg/m · 0.566 lb/ft | 1.124 kg/m · 0.755 lb/ft | 1.405 kg/m · 0.944 lb/ft | 1.686 kg/m · 1.133 lb/ft | 2.248 kg/m · 1.511 lb/ft | 2.810 kg/m · 1.888 lb/ft | 3.372 kg/m · 2.266 lb/ft | 4.496 kg/m · 3.021 lb/ft | 5.620 kg/m · 3.776 lb/ft |
Rows: width (mm). Columns: thickness (mm). Computed for Aluminum 7075-T6 at 2810 kg/m³.
| Width | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| 12 mm | 36.0 | 48.0 | 60.0 | 72.0 | 96.0 | 120.0 | 144.0 | 192.0 | 240.0 |
| 16 mm | 48.0 | 64.0 | 80.0 | 96.0 | 128.0 | 160.0 | 192.0 | 256.0 | 320.0 |
| 20 mm | 60.0 | 80.0 | 100.0 | 120.0 | 160.0 | 200.0 | 240.0 | 320.0 | 400.0 |
| 25 mm | 75.0 | 100.0 | 125.0 | 150.0 | 200.0 | 250.0 | 300.0 | 400.0 | 500.0 |
| 30 mm | 90.0 | 120.0 | 150.0 | 180.0 | 240.0 | 300.0 | 360.0 | 480.0 | 600.0 |
| 40 mm | 120.0 | 160.0 | 200.0 | 240.0 | 320.0 | 400.0 | 480.0 | 640.0 | 800.0 |
| 50 mm | 150.0 | 200.0 | 250.0 | 300.0 | 400.0 | 500.0 | 600.0 | 800.0 | 1,000.0 |
| 60 mm | 180.0 | 240.0 | 300.0 | 360.0 | 480.0 | 600.0 | 720.0 | 960.0 | 1,200.0 |
| 80 mm | 240.0 | 320.0 | 400.0 | 480.0 | 640.0 | 800.0 | 960.0 | 1,280.0 | 1,600.0 |
| 100 mm | 300.0 | 400.0 | 500.0 | 600.0 | 800.0 | 1,000.0 | 1,200.0 | 1,600.0 | 2,000.0 |
Area is a property of the geometry alone, so this table is the same for every material. It is what you enter into a stress calculation; the mass table is what you enter into an order.
Each row is one nominal size. Because the area is computed from your dimensions rather than read from a mill table, a non-standard size is just as accurate — put it into the calculator above rather than interpolating between rows.
The same flat bar in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Aluminum 7075-T6 is highlighted. The percentage column is against carbon steel, which is the figure most quotations are built on.
| Material | Density kg/m³ | lb/in³ | Mass / length kg/m | lb/ft | vs carbon steel |
|---|---|---|---|---|---|
| Carbon Steel | 7,850 | 0.2836 | 2.355 | 1.582 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 2.400 | 1.613 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 2.400 | 1.613 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 2.400 | 1.613 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 2.310 | 1.552 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 0.810 | 0.544 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 0.804 | 0.540 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 0.843 | 0.566 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 2.682 | 1.802 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 2.550 | 1.714 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 2.640 | 1.774 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 1.353 | 0.909 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 2.160 | 1.451 | -8.3 % |
| Lead | 11,340 | 0.4097 | 3.402 | 2.286 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.420 | 0.282 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.288 | 0.194 | -87.8 % |
Same geometry throughout, so the only variable is density. Carbon steel is highlighted as the baseline.
A note on using this table for costing: mass is not price. Aluminium is roughly a third of steel's mass here, but per kilogram it costs several times more, so a straight swap rarely saves money — what it buys is reduced load on a structure or a vehicle.
About aluminum 7075-t6
Zinc-bearing, aerospace-grade and the strongest aluminium in ordinary supply — comparable in strength to some mild steels. It is also the densest aluminium here at 2,810 kg/m³, which is the trade-off nobody mentions: choosing 7075 over 6061 for strength costs 4.1 % more mass for the same volume. Its corrosion resistance is poor without cladding or anodising, and it is generally considered unweldable, so it belongs in machined and riveted parts, not fabricated frames.
- Density
- 2,810 kg/m³ = 0.1015 lb/in³ · 0.3580× carbon steel · typical spread ±1 %
- Specification
- ASTM B211 / B209 (T6 temper)
- Equivalents
- EN AW-7075 · JIS A7075 · GB 7075
- Typical uses
- Aerospace structural parts · High-load bicycle and motorsport · Moulds and tooling plate · Precision machined fittings
Not recommended for sustained elevated-temperature service; strength falls off well before 6061’s does.
About flat bar
Flat bar is where the site’s most common estimating mistake shows up: weight is independent of how the bar is oriented, but stiffness is not. A 50 × 6 flat bent about its strong axis is roughly 69 times stiffer than the same bar bent about its weak axis, while both weigh 2.36 kg/m. Reading weight off a flat-bar table tells you what to order; it tells you nothing about whether the section will carry the load.
Specified as width × thickness. Edge condition (square, radiused, or sheared) changes the effective area slightly, not the nominal weight.
Download this data
AL 7075 flat bar — CSV
Both buttons below read the tables rendered on this page, so the file matches what you are looking at. The full catalogue — all 16 materials across all 10 sections — is on the downloads page.
Fields are quoted per RFC 4180, with a UTF-8 byte-order mark so Excel reads the mm² and · characters correctly. Blank lines separate the weight matrix from the area matrix.
Frequently asked questions
How much does aluminum 7075-t6 flat bar weigh?
At the reference dimensions (w = 50 mm, t = 6 mm) a aluminum 7075-t6 flat bar of this size weighs 0.843 kg/m, or 0.566 lb/ft. The table above lists the figure for every standard size so you can read your size directly instead of scaling.
How is the weight of flat bar calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = w · t. At the reference dimensions that gives 300.0 mm², and multiplying by aluminum 7075-t6's density of 2,810 kg/m³ gives 0.843 kg/m. Nothing is looked up in a table — which is why a non-standard size is calculated just as accurately as a standard one.
Why does aluminum 7075-t6 weigh more or less than steel?
It is lighter than carbon steel for the same section — about 64 % lighter at 2,810 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a flat bar of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 0.3580× carbon steel.
What is the cross-sectional area of a flat bar?
The area depends only on the dimensions, not on the material, so it is identical whichever material you select: at the reference dimensions it is 300.0 mm² (0.4650 in²). That is the number you would enter into a stress or deflection calculation, and it is why changing material on this page never changes the area column.
Does a al 7075 flat bar weigh the same as a al 7075 part of a different shape?
No, and the difference is larger than most people expect. At equal nominal size, a square bar is 27.3 % heavier than a round bar, and a hollow section is typically 60–80 % lighter than the solid bar it replaces. Weight follows area, and area changes faster than dimensions do — which is exactly why this needs calculating rather than estimating.
Should I use AL 7075 weight or carbon steel weight for costing?
Use the material you are actually buying. At 2,810 kg/m³ against carbon steel's 7,850 kg/m³, the same flat bar differs by 64.2 % in mass. On a per-metre quote that is invisible; on a fabricated tonnage it is the difference between a margin and a loss. This page computes the steel figure as 2.355 kg/m for comparison.
Other materials, same flat bar
The same geometry in every material, so the only variable is density.
- Carbon steel flat bar — 7850 kg/m³
- SS 304 flat bar — 8000 kg/m³
- SS 316 flat bar — 8000 kg/m³
- AL 6061 flat bar — 2700 kg/m³
- Copper flat bar — 8940 kg/m³
- Brass flat bar — 8500 kg/m³
- HDPE flat bar — 960 kg/m³
- PVC flat bar — 1400 kg/m³
Other AL 7075 sections
The same density applied to every shape the site covers.
- AL 7075 round bar — A = π/4 · d²
- AL 7075 square bar — A = a²
- AL 7075 hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- AL 7075 plate — A = w · t
- AL 7075 round tube — A = π/4 · (D² − d²), d = D − 2t
- AL 7075 square tube — A = a² − (a − 2t)²
Reference data and tools
- Metal weight overview — how the calculation works
- All 16 materials — densities and specifications
- All 10 sections — formulas and size series
- Density chart — lightest to heaviest
- Metal weight calculator — any size, any material
- All calculators — metal weight and pipe weight
- Download the data — CSV, generated from the same source
- Cross-reference tables — DN / NPS / material equivalents
- Methodology and sources — where every number comes from
Flat Bar area from A = w · t. Mass computed as area × length × density at 2,810 kg/m³ (ASTM B211 / B209 (T6 temper)). No weight on this page is copied from a published table — which is why figures can differ in the last significant digit from a mill's chart calculated at a nominal density.
- Elementary plane geometry. The circle, polygon and hollow-section area formulas.
- ASTM material specifications for each grade named in the material entry (A36, A240/A276, B209/B211/B221, B152/B16/B505, B265/B348, A48, B29, D1784, D3350).
- BIPM / NIST definitional constants: international inch = 25.4 mm, foot = 0.3048 m, pound = 0.45359237 kg.
Dataset version 2026.09.1 · dimensions last verified against source 2026-09-21. Found an error? Report it — corrections are issued with a version bump.