Aluminum 6061-T6 Angle (L Section) Weight
Mass per metre and per foot for aluminum 6061-t6 angle (l section) at 2,700 kg/m³ (ASTM B221 / B209 (T6 temper)). Every figure is for the section as drawn. A 6 m length of this size weighs 7.7 kg (17.2 lb per 20 ft).
At the reference dimensions (a = 50 mm, b = 50 mm, t = 5 mm) this section has a cross-sectional area of 475.0 mm², giving 1.282 kg/m (0.862 lb/ft). Against carbon steel's 7,850 kg/m³ that is -65.6 % — the same section in steel would be 3.729 kg/m.
Angle (L Section) — formula and derivation
Area of a angle (l section)
A = t · (a + b − t)
A = t × (a + b − t), where a and b are the two leg lengths and t the thickness. Equal-leg angles set a = b, giving A = t(2a − t)
Worked through with the default dimensions:
A = t × (a + b − t)A = 5 × (50 + 50 − 5)A = 5 × 95.0A = 475.0 mm²
- a
- Leg a
- b
- Leg b
- 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 2,700 kg/m³ that is 1.2825 kg/m for the reference size above.
AL 6061 angle (l section) — size series
| Leg a | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 15 |
|---|---|---|---|---|---|---|---|---|
| 20 mm | 0.300 kg/m · 0.201 lb/ft | 0.389 kg/m · 0.261 lb/ft | 0.472 kg/m · 0.318 lb/ft | 0.551 kg/m · 0.370 lb/ft | 0.691 kg/m · 0.464 lb/ft | 0.810 kg/m · 0.544 lb/ft | 0.907 kg/m · 0.610 lb/ft | 1.012 kg/m · 0.680 lb/ft |
| 25 mm | 0.381 kg/m · 0.256 lb/ft | 0.497 kg/m · 0.334 lb/ft | 0.607 kg/m · 0.408 lb/ft | 0.713 kg/m · 0.479 lb/ft | 0.907 kg/m · 0.610 lb/ft | 1.080 kg/m · 0.726 lb/ft | 1.231 kg/m · 0.827 lb/ft | 1.417 kg/m · 0.953 lb/ft |
| 30 mm | 0.462 kg/m · 0.310 lb/ft | 0.605 kg/m · 0.406 lb/ft | 0.742 kg/m · 0.499 lb/ft | 0.875 kg/m · 0.588 lb/ft | 1.123 kg/m · 0.755 lb/ft | 1.350 kg/m · 0.907 lb/ft | 1.555 kg/m · 1.045 lb/ft | 1.822 kg/m · 1.225 lb/ft |
| 40 mm | 0.624 kg/m · 0.419 lb/ft | 0.821 kg/m · 0.552 lb/ft | 1.012 kg/m · 0.680 lb/ft | 1.199 kg/m · 0.806 lb/ft | 1.555 kg/m · 1.045 lb/ft | 1.890 kg/m · 1.270 lb/ft | 2.203 kg/m · 1.480 lb/ft | 2.632 kg/m · 1.769 lb/ft |
| 50 mm | 0.786 kg/m · 0.528 lb/ft | 1.037 kg/m · 0.697 lb/ft | 1.282 kg/m · 0.862 lb/ft | 1.523 kg/m · 1.023 lb/ft | 1.987 kg/m · 1.335 lb/ft | 2.430 kg/m · 1.633 lb/ft | 2.851 kg/m · 1.916 lb/ft | 3.442 kg/m · 2.313 lb/ft |
| 60 mm | 0.948 kg/m · 0.637 lb/ft | 1.253 kg/m · 0.842 lb/ft | 1.552 kg/m · 1.043 lb/ft | 1.847 kg/m · 1.241 lb/ft | 2.419 kg/m · 1.626 lb/ft | 2.970 kg/m · 1.996 lb/ft | 3.499 kg/m · 2.351 lb/ft | 4.253 kg/m · 2.858 lb/ft |
| 70 mm | 1.110 kg/m · 0.746 lb/ft | 1.469 kg/m · 0.987 lb/ft | 1.822 kg/m · 1.225 lb/ft | 2.171 kg/m · 1.459 lb/ft | 2.851 kg/m · 1.916 lb/ft | 3.510 kg/m · 2.359 lb/ft | 4.147 kg/m · 2.787 lb/ft | 5.063 kg/m · 3.402 lb/ft |
| 80 mm | 1.272 kg/m · 0.855 lb/ft | 1.685 kg/m · 1.132 lb/ft | 2.092 kg/m · 1.406 lb/ft | 2.495 kg/m · 1.676 lb/ft | 3.283 kg/m · 2.206 lb/ft | 4.050 kg/m · 2.721 lb/ft | 4.795 kg/m · 3.222 lb/ft | 5.872 kg/m · 3.946 lb/ft |
| 90 mm | 1.434 kg/m · 0.963 lb/ft | 1.901 kg/m · 1.277 lb/ft | 2.362 kg/m · 1.588 lb/ft | 2.819 kg/m · 1.894 lb/ft | 3.715 kg/m · 2.496 lb/ft | 4.590 kg/m · 3.084 lb/ft | 5.443 kg/m · 3.658 lb/ft | 6.682 kg/m · 4.490 lb/ft |
| 100 mm | 1.596 kg/m · 1.072 lb/ft | 2.117 kg/m · 1.422 lb/ft | 2.632 kg/m · 1.769 lb/ft | 3.143 kg/m · 2.112 lb/ft | 4.147 kg/m · 2.787 lb/ft | 5.130 kg/m · 3.447 lb/ft | 6.091 kg/m · 4.093 lb/ft | 7.492 kg/m · 5.035 lb/ft |
| 120 mm | 1.920 kg/m · 1.290 lb/ft | 2.549 kg/m · 1.713 lb/ft | 3.173 kg/m · 2.132 lb/ft | 3.791 kg/m · 2.547 lb/ft | 5.011 kg/m · 3.367 lb/ft | 6.210 kg/m · 4.173 lb/ft | 7.387 kg/m · 4.964 lb/ft | 9.113 kg/m · 6.123 lb/ft |
| 150 mm | 2.406 kg/m · 1.617 lb/ft | 3.197 kg/m · 2.148 lb/ft | 3.982 kg/m · 2.676 lb/ft | 4.763 kg/m · 3.200 lb/ft | 6.307 kg/m · 4.238 lb/ft | 7.830 kg/m · 5.262 lb/ft | 9.331 kg/m · 6.270 lb/ft | 11.543 kg/m · 7.756 lb/ft |
Rows: leg a (mm). Columns: thickness (mm). Computed for Aluminum 6061-T6 at 2700 kg/m³.
| Leg a | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 15 |
|---|---|---|---|---|---|---|---|---|
| 20 mm | 111.0 | 144.0 | 175.0 | 204.0 | 256.0 | 300.0 | 336.0 | 375.0 |
| 25 mm | 141.0 | 184.0 | 225.0 | 264.0 | 336.0 | 400.0 | 456.0 | 525.0 |
| 30 mm | 171.0 | 224.0 | 275.0 | 324.0 | 416.0 | 500.0 | 576.0 | 675.0 |
| 40 mm | 231.0 | 304.0 | 375.0 | 444.0 | 576.0 | 700.0 | 816.0 | 975.0 |
| 50 mm | 291.0 | 384.0 | 475.0 | 564.0 | 736.0 | 900.0 | 1,056.0 | 1,275.0 |
| 60 mm | 351.0 | 464.0 | 575.0 | 684.0 | 896.0 | 1,100.0 | 1,296.0 | 1,575.0 |
| 70 mm | 411.0 | 544.0 | 675.0 | 804.0 | 1,056.0 | 1,300.0 | 1,536.0 | 1,875.0 |
| 80 mm | 471.0 | 624.0 | 775.0 | 924.0 | 1,216.0 | 1,500.0 | 1,776.0 | 2,175.0 |
| 90 mm | 531.0 | 704.0 | 875.0 | 1,044.0 | 1,376.0 | 1,700.0 | 2,016.0 | 2,475.0 |
| 100 mm | 591.0 | 784.0 | 975.0 | 1,164.0 | 1,536.0 | 1,900.0 | 2,256.0 | 2,775.0 |
| 120 mm | 711.0 | 944.0 | 1,175.0 | 1,404.0 | 1,856.0 | 2,300.0 | 2,736.0 | 3,375.0 |
| 150 mm | 891.0 | 1,184.0 | 1,475.0 | 1,764.0 | 2,336.0 | 2,900.0 | 3,456.0 | 4,275.0 |
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 angle (l section) in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Aluminum 6061-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 | 3.729 | 2.506 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.800 | 2.553 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.800 | 2.553 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.800 | 2.553 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.658 | 2.458 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.282 | 0.862 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.273 | 0.855 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.335 | 0.897 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 4.247 | 2.854 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 4.037 | 2.713 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 4.180 | 2.809 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 2.142 | 1.440 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.420 | 2.298 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.386 | 3.620 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.665 | 0.447 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.456 | 0.306 | -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 6061-t6
The general-purpose structural aluminium: magnesium and silicon alloyed, precipitation-hardened to T6, readily welded and machined. At 2,700 kg/m³ it is 2.91 times lighter than carbon steel, which is the entire reason it gets specified — but designers routinely forget that its modulus is also only about a third of steel’s, so a straight aluminium-for-steel swap cuts mass by 66 % while roughly tripling deflection for the same section. Weight savings and stiffness are separate problems.
- Density
- 2,700 kg/m³ = 0.0975 lb/in³ · 0.3439× carbon steel · typical spread ±1 %
- Specification
- ASTM B221 / B209 (T6 temper)
- Equivalents
- EN AW-6061 · JIS A6061 · GB 6061
- Typical uses
- Aircraft and drone frames · Marine decking and masts · Machine guards and jigs · Truck and trailer bodies
About angle (l section)
The angle formula quietly removes a double-counted corner: A = t(a + b − t) is t times each leg, less one t² for the square where the legs overlap. Skipping that correction overstates the area of a 50 × 50 × 5 angle by 10 %. Angles also bend about neither leg — the governing axis passes through the centroid, which sits off both legs, and it is why an equal angle is normally used back-to-back with a twin where bending matters. This table holds legs equal; put unequal legs into the calculator when the drawing specifies them.
Specified as leg a × leg b × thickness. Say whether the toe is square or radiused, and whether it is equal-leg.
Download this data
AL 6061 angle (l section) — 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 6061-t6 angle (l section) weigh?
At the reference dimensions (a = 50 mm, b = 50 mm, t = 5 mm) a aluminum 6061-t6 angle (l section) of this size weighs 1.282 kg/m, or 0.862 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 angle (l section) calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = t · (a + b − t). At the reference dimensions that gives 475.0 mm², and multiplying by aluminum 6061-t6's density of 2,700 kg/m³ gives 1.282 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 6061-t6 weigh more or less than steel?
It is lighter than carbon steel for the same section — about 66 % lighter at 2,700 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a angle (l section) of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 0.3439× carbon steel.
What is the cross-sectional area of a angle (l section)?
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 475.0 mm² (0.7363 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 6061 angle (l section) weigh the same as a al 6061 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 6061 weight or carbon steel weight for costing?
Use the material you are actually buying. At 2,700 kg/m³ against carbon steel's 7,850 kg/m³, the same angle (l section) differs by 65.6 % 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 3.729 kg/m for comparison.
Other materials, same angle (l section)
The same geometry in every material, so the only variable is density.
- Carbon steel angle (l section) — 7850 kg/m³
- SS 304 angle (l section) — 8000 kg/m³
- SS 316 angle (l section) — 8000 kg/m³
- Copper angle (l section) — 8940 kg/m³
- Brass angle (l section) — 8500 kg/m³
- HDPE angle (l section) — 960 kg/m³
- PVC angle (l section) — 1400 kg/m³
- AL 5052 angle (l section) — 2680 kg/m³
Other AL 6061 sections
The same density applied to every shape the site covers.
- AL 6061 round bar — A = π/4 · d²
- AL 6061 square bar — A = a²
- AL 6061 hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- AL 6061 flat bar — A = w · t
- AL 6061 plate — A = w · t
- AL 6061 round tube — A = π/4 · (D² − d²), d = D − 2t
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
Angle (L Section) area from A = t · (a + b − t). Mass computed as area × length × density at 2,700 kg/m³ (ASTM B221 / 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.