SpecBase

Aluminum 7075-T6 Hexagonal Bar Weight

Mass per metre and per foot for aluminum 7075-t6 hexagonal 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 8.4 kg (18.8 lb per 20 ft).

Mass / length
1.402kg/m
0.942 lb/ft
Cross-section
498.8mm²
0.7732 in²
Reference size
24mm
AF
Density
2,810kg/m³
0.1015 lb/in³
6 m / 20 ft length
8.4kg
18.8 lb

At the reference dimensions (AF = 24 mm) this section has a cross-sectional area of 498.8 mm², giving 1.402 kg/m (0.942 lb/ft). Against carbon steel's 7,850 kg/m³ that is -64.2 % — the same section in steel would be 3.916 kg/m.

Calculate your own dimensions → Pipe and hollow sections

Hexagonal Bar — formula and derivation

Area of a hexagonal bar

A = (√3/2) · AF² ≈ 0.8660 · AF²

A = (√3/2) × AF², where AF is the distance across flats (the wrench size), not across corners

Worked through with the default dimensions:

A = (√3/2) × AF²A = 0.866025 × 24²A = 0.866025 × 576.0A = 498.8 mm²
AF
Across flats (AF) — Distance between opposite flats — the size a spanner grips. Hex bar is ordered by AF, not by corner-to-corner.

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 1.4017 kg/m for the reference size above.

AL 7075 hexagonal bar — size series

Aluminum 7075-T6 hexagonal bar — by across flats (af)
Across flats (AF) Cross-section Mass / length
5.0 mm 21.65 mm² · 0.0336 in² 0.061 kg/m · 0.041 lb/ft
6.0 mm 31.18 mm² · 0.0483 in² 0.088 kg/m · 0.059 lb/ft
8.0 mm 55.43 mm² · 0.0859 in² 0.156 kg/m · 0.105 lb/ft
10 mm 86.60 mm² · 0.1342 in² 0.243 kg/m · 0.164 lb/ft
12 mm 124.71 mm² · 0.1933 in² 0.350 kg/m · 0.235 lb/ft
14 mm 169.74 mm² · 0.2631 in² 0.477 kg/m · 0.321 lb/ft
17 mm 250.28 mm² · 0.3879 in² 0.703 kg/m · 0.473 lb/ft
19 mm 312.64 mm² · 0.4846 in² 0.879 kg/m · 0.590 lb/ft
22 mm 419.16 mm² · 0.6497 in² 1.178 kg/m · 0.791 lb/ft
24 mm 498.83 mm² · 0.7732 in² 1.402 kg/m · 0.942 lb/ft
27 mm 631.33 mm² · 0.9786 in² 1.774 kg/m · 1.192 lb/ft
32 mm 886.81 mm² · 1.3746 in² 2.492 kg/m · 1.675 lb/ft
36 mm 1,122.37 mm² · 1.7397 in² 3.154 kg/m · 2.119 lb/ft
41 mm 1,455.79 mm² · 2.2565 in² 4.091 kg/m · 2.749 lb/ft
46 mm 1,832.51 mm² · 2.8404 in² 5.149 kg/m · 3.460 lb/ft
50 mm 2,165.06 mm² · 3.3559 in² 6.084 kg/m · 4.088 lb/ft

Computed for AL 7075 at 2810 kg/m³ (0.1015 lb/in³). ASTM B211 / B209 (T6 temper).

How to read this table

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.

Imperial sizes

Hexagonal Bar is also bought in inch sizes. The conversions below are exact (1 in = 25.4 mm by definition), so the metric equivalents are the true millimetre dimensions rather than a rounded nominal figure.

AL 7075 — common inch hex bar (across flats)
Stock size Metric equivalent mm Cross-section Mass / length
1/4 in 6.35 34.92 mm² · 0.0541 in² 0.098 kg/m · 0.066 lb/ft
5/16 in 7.94 54.56 mm² · 0.0846 in² 0.153 kg/m · 0.103 lb/ft
3/8 in 9.52 78.57 mm² · 0.1218 in² 0.221 kg/m · 0.148 lb/ft
7/16 in 11.11 106.94 mm² · 0.1658 in² 0.301 kg/m · 0.202 lb/ft
1/2 in 12.70 139.68 mm² · 0.2165 in² 0.393 kg/m · 0.264 lb/ft
9/16 in 14.29 176.78 mm² · 0.2740 in² 0.497 kg/m · 0.334 lb/ft
5/8 in 15.88 218.25 mm² · 0.3383 in² 0.613 kg/m · 0.412 lb/ft
3/4 in 19.05 314.28 mm² · 0.4871 in² 0.883 kg/m · 0.593 lb/ft
7/8 in 22.22 427.77 mm² · 0.6631 in² 1.202 kg/m · 0.808 lb/ft
1 in 25.40 558.72 mm² · 0.8660 in² 1.570 kg/m · 1.055 lb/ft
1-1/4 in 31.75 873.01 mm² · 1.3532 in² 2.453 kg/m · 1.648 lb/ft
1-1/2 in 38.10 1,257.13 mm² · 1.9486 in² 3.533 kg/m · 2.374 lb/ft
2 in 50.80 2,234.90 mm² · 3.4641 in² 6.280 kg/m · 4.220 lb/ft

Stock sizes in inches, converted exactly at 25.4 mm per inch. Material: Aluminum 7075-T6 at 2810 kg/m³.

The same hexagonal 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.

Hexagonal Bar at AF = 24 mm — mass in every material
Material Density kg/m³ lb/in³ Mass / length kg/m lb/ft vs carbon steel
Carbon Steel 7,850 0.2836 3.916 2.631 +0.0 %
Stainless Steel 304 8,000 0.2890 3.991 2.682 +1.9 %
Stainless Steel 316 8,000 0.2890 3.991 2.682 +1.9 %
Stainless Steel 316L 8,000 0.2890 3.991 2.682 +1.9 %
Stainless Steel 430 7,700 0.2782 3.841 2.581 -1.9 %
Aluminum 6061-T6 2,700 0.0975 1.347 0.905 -65.6 %
Aluminum 5052-H32 2,680 0.0968 1.337 0.898 -65.9 %
Aluminum 7075-T6 2,810 0.1015 1.402 0.942 -64.2 %
Copper C11000 8,940 0.3230 4.460 2.997 +13.9 %
Brass C36000 8,500 0.3071 4.240 2.849 +8.3 %
Bronze C93200 8,800 0.3179 4.390 2.950 +12.1 %
Titanium Grade 2 4,510 0.1629 2.250 1.512 -42.5 %
Gray Cast Iron 7,200 0.2601 3.592 2.413 -8.3 %
Lead 11,340 0.4097 5.657 3.801 +44.5 %
Rigid PVC (Type I) 1,400 0.0506 0.698 0.469 -82.2 %
HDPE (PE 100) 960 0.0347 0.479 0.322 -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
Weight-relevant caution

Not recommended for sustained elevated-temperature service; strength falls off well before 6061’s does.

About hexagonal bar

Hex bar is the one shape where the ordering dimension is not the dimension the formula wants. Stock is sold by across-flats (AF) because that is what the wrench grips, but the area formula needs AF as well — and the two are easy to confuse once a drawing quotes across-corners instead. Across-corners is a factor of 2/√3 (1.1547) larger than AF, so mixing them up inflates the calculated weight by 33 %. Always check which one the drawing calls out.

When ordering

Specified by across-flats. Say so explicitly on the order — "across corners" gives a different bar.

Download this data

AL 7075 hexagonal 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.

All materials (CSV · 16 × 10 pages)

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 hexagonal bar weigh?

At the reference dimensions (AF = 24 mm) a aluminum 7075-t6 hexagonal bar of this size weighs 1.402 kg/m, or 0.942 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 hexagonal bar calculated?

Weight is cross-sectional area × length × density. For this shape the area is A = (√3/2) · AF² ≈ 0.8660 · AF². At the reference dimensions that gives 498.8 mm², and multiplying by aluminum 7075-t6's density of 2,810 kg/m³ gives 1.402 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 hexagonal 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 hexagonal 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 498.8 mm² (0.7732 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 hexagonal 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 hexagonal 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 3.916 kg/m for comparison.

Other materials, same hexagonal bar

The same geometry in every material, so the only variable is density.

Other AL 7075 sections

The same density applied to every shape the site covers.

Reference data and tools

Data source and method

Hexagonal Bar area from A = (√3/2) · AF² ≈ 0.8660 · AF². 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.