SpecBase

Brass C36000 Hexagonal Bar Weight

Mass per metre and per foot for brass c36000 hexagonal bar at 8,500 kg/m³ (ASTM B16 (UNS C36000, free-cutting)). Every figure is for the section as drawn. A 6 m length of this size weighs 25.4 kg (57.0 lb per 20 ft).

Mass / length
4.240kg/m
2.849 lb/ft
Cross-section
498.8mm²
0.7732 in²
Reference size
24mm
AF
Density
8,500kg/m³
0.3071 lb/in³
6 m / 20 ft length
25.4kg
57.0 lb

At the reference dimensions (AF = 24 mm) this section has a cross-sectional area of 498.8 mm², giving 4.240 kg/m (2.849 lb/ft). Against carbon steel's 7,850 kg/m³ that is +8.3 % — 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 8,500 kg/m³ that is 4.2401 kg/m for the reference size above.

Brass hexagonal bar — size series

Brass C36000 hexagonal bar — by across flats (af)
Across flats (AF) Cross-section Mass / length
5.0 mm 21.65 mm² · 0.0336 in² 0.184 kg/m · 0.124 lb/ft
6.0 mm 31.18 mm² · 0.0483 in² 0.265 kg/m · 0.178 lb/ft
8.0 mm 55.43 mm² · 0.0859 in² 0.471 kg/m · 0.317 lb/ft
10 mm 86.60 mm² · 0.1342 in² 0.736 kg/m · 0.495 lb/ft
12 mm 124.71 mm² · 0.1933 in² 1.060 kg/m · 0.712 lb/ft
14 mm 169.74 mm² · 0.2631 in² 1.443 kg/m · 0.970 lb/ft
17 mm 250.28 mm² · 0.3879 in² 2.127 kg/m · 1.430 lb/ft
19 mm 312.64 mm² · 0.4846 in² 2.657 kg/m · 1.786 lb/ft
22 mm 419.16 mm² · 0.6497 in² 3.563 kg/m · 2.394 lb/ft
24 mm 498.83 mm² · 0.7732 in² 4.240 kg/m · 2.849 lb/ft
27 mm 631.33 mm² · 0.9786 in² 5.366 kg/m · 3.606 lb/ft
32 mm 886.81 mm² · 1.3746 in² 7.538 kg/m · 5.065 lb/ft
36 mm 1,122.37 mm² · 1.7397 in² 9.540 kg/m · 6.411 lb/ft
41 mm 1,455.79 mm² · 2.2565 in² 12.374 kg/m · 8.315 lb/ft
46 mm 1,832.51 mm² · 2.8404 in² 15.576 kg/m · 10.467 lb/ft
50 mm 2,165.06 mm² · 3.3559 in² 18.403 kg/m · 12.366 lb/ft

Computed for Brass at 8500 kg/m³ (0.3071 lb/in³). ASTM B16 (UNS C36000, free-cutting).

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.

Brass — 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 0.297 kg/m · 0.199 lb/ft
5/16 in 7.94 54.56 mm² · 0.0846 in² 0.464 kg/m · 0.312 lb/ft
3/8 in 9.52 78.57 mm² · 0.1218 in² 0.668 kg/m · 0.449 lb/ft
7/16 in 11.11 106.94 mm² · 0.1658 in² 0.909 kg/m · 0.611 lb/ft
1/2 in 12.70 139.68 mm² · 0.2165 in² 1.187 kg/m · 0.798 lb/ft
9/16 in 14.29 176.78 mm² · 0.2740 in² 1.503 kg/m · 1.010 lb/ft
5/8 in 15.88 218.25 mm² · 0.3383 in² 1.855 kg/m · 1.247 lb/ft
3/4 in 19.05 314.28 mm² · 0.4871 in² 2.671 kg/m · 1.795 lb/ft
7/8 in 22.22 427.77 mm² · 0.6631 in² 3.636 kg/m · 2.443 lb/ft
1 in 25.40 558.72 mm² · 0.8660 in² 4.749 kg/m · 3.191 lb/ft
1-1/4 in 31.75 873.01 mm² · 1.3532 in² 7.421 kg/m · 4.986 lb/ft
1-1/2 in 38.10 1,257.13 mm² · 1.9486 in² 10.686 kg/m · 7.180 lb/ft
2 in 50.80 2,234.90 mm² · 3.4641 in² 18.997 kg/m · 12.765 lb/ft

Stock sizes in inches, converted exactly at 25.4 mm per inch. Material: Brass C36000 at 8500 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. Brass C36000 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 brass c36000

Free-cutting brass, roughly 61 % copper and 3 % lead, and by a wide margin the most machinable common metal — it machines at about three times the speed of 1018 steel with excellent finish. Density 8,500 kg/m³ puts it 8.3 % above carbon steel. The lead that makes it machine so well is also why it is restricted in potable-water contact under many national rules, which pushes fittings toward lead-free silicon or bismuth brasses with densities 0.5–1 % lower.

Density
8,500 kg/m³ = 0.3071 lb/in³ · 1.0828× carbon steel · typical spread ±2 %
Specification
ASTM B16 (UNS C36000, free-cutting)
Equivalents
EN CW603N · JIS C3604 · GB HPb59-1
Typical uses
Fittings and valves · Instrument and clock parts · Electrical connectors · Decorative hardware
Weight-relevant caution

Lead content (typically 2.5–3.7 %) restricts use in potable water. Typical density range 8,400–8,700 kg/m³ by composition.

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

Brass 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 brass c36000 hexagonal bar weigh?

At the reference dimensions (AF = 24 mm) a brass c36000 hexagonal bar of this size weighs 4.240 kg/m, or 2.849 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 brass c36000's density of 8,500 kg/m³ gives 4.240 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 brass c36000 weigh more or less than steel?

It is heavier than carbon steel for the same section — about 8 % heavier at 8,500 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 1.0828× 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 brass hexagonal bar weigh the same as a brass 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 Brass weight or carbon steel weight for costing?

Use the material you are actually buying. At 8,500 kg/m³ against carbon steel's 7,850 kg/m³, the same hexagonal bar differs by 8.3 % 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 Brass 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 8,500 kg/m³ (ASTM B16 (UNS C36000, free-cutting)). 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.