Brass C36000 Flat Bar Weight
Mass per metre and per foot for brass c36000 flat 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 15.3 kg (34.3 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 2.550 kg/m (1.714 lb/ft). Against carbon steel's 7,850 kg/m³ that is +8.3 % — 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 8,500 kg/m³ that is 2.5500 kg/m for the reference size above.
Brass flat bar — size series
| Width | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.306 kg/m · 0.206 lb/ft | 0.408 kg/m · 0.274 lb/ft | 0.510 kg/m · 0.343 lb/ft | 0.612 kg/m · 0.411 lb/ft | 0.816 kg/m · 0.548 lb/ft | 1.020 kg/m · 0.685 lb/ft | 1.224 kg/m · 0.822 lb/ft | 1.632 kg/m · 1.097 lb/ft | 2.040 kg/m · 1.371 lb/ft |
| 16 mm | 0.408 kg/m · 0.274 lb/ft | 0.544 kg/m · 0.366 lb/ft | 0.680 kg/m · 0.457 lb/ft | 0.816 kg/m · 0.548 lb/ft | 1.088 kg/m · 0.731 lb/ft | 1.360 kg/m · 0.914 lb/ft | 1.632 kg/m · 1.097 lb/ft | 2.176 kg/m · 1.462 lb/ft | 2.720 kg/m · 1.828 lb/ft |
| 20 mm | 0.510 kg/m · 0.343 lb/ft | 0.680 kg/m · 0.457 lb/ft | 0.850 kg/m · 0.571 lb/ft | 1.020 kg/m · 0.685 lb/ft | 1.360 kg/m · 0.914 lb/ft | 1.700 kg/m · 1.142 lb/ft | 2.040 kg/m · 1.371 lb/ft | 2.720 kg/m · 1.828 lb/ft | 3.400 kg/m · 2.285 lb/ft |
| 25 mm | 0.637 kg/m · 0.428 lb/ft | 0.850 kg/m · 0.571 lb/ft | 1.063 kg/m · 0.714 lb/ft | 1.275 kg/m · 0.857 lb/ft | 1.700 kg/m · 1.142 lb/ft | 2.125 kg/m · 1.428 lb/ft | 2.550 kg/m · 1.714 lb/ft | 3.400 kg/m · 2.285 lb/ft | 4.250 kg/m · 2.856 lb/ft |
| 30 mm | 0.765 kg/m · 0.514 lb/ft | 1.020 kg/m · 0.685 lb/ft | 1.275 kg/m · 0.857 lb/ft | 1.530 kg/m · 1.028 lb/ft | 2.040 kg/m · 1.371 lb/ft | 2.550 kg/m · 1.714 lb/ft | 3.060 kg/m · 2.056 lb/ft | 4.080 kg/m · 2.742 lb/ft | 5.100 kg/m · 3.427 lb/ft |
| 40 mm | 1.020 kg/m · 0.685 lb/ft | 1.360 kg/m · 0.914 lb/ft | 1.700 kg/m · 1.142 lb/ft | 2.040 kg/m · 1.371 lb/ft | 2.720 kg/m · 1.828 lb/ft | 3.400 kg/m · 2.285 lb/ft | 4.080 kg/m · 2.742 lb/ft | 5.440 kg/m · 3.656 lb/ft | 6.800 kg/m · 4.569 lb/ft |
| 50 mm | 1.275 kg/m · 0.857 lb/ft | 1.700 kg/m · 1.142 lb/ft | 2.125 kg/m · 1.428 lb/ft | 2.550 kg/m · 1.714 lb/ft | 3.400 kg/m · 2.285 lb/ft | 4.250 kg/m · 2.856 lb/ft | 5.100 kg/m · 3.427 lb/ft | 6.800 kg/m · 4.569 lb/ft | 8.500 kg/m · 5.712 lb/ft |
| 60 mm | 1.530 kg/m · 1.028 lb/ft | 2.040 kg/m · 1.371 lb/ft | 2.550 kg/m · 1.714 lb/ft | 3.060 kg/m · 2.056 lb/ft | 4.080 kg/m · 2.742 lb/ft | 5.100 kg/m · 3.427 lb/ft | 6.120 kg/m · 4.112 lb/ft | 8.160 kg/m · 5.483 lb/ft | 10.200 kg/m · 6.854 lb/ft |
| 80 mm | 2.040 kg/m · 1.371 lb/ft | 2.720 kg/m · 1.828 lb/ft | 3.400 kg/m · 2.285 lb/ft | 4.080 kg/m · 2.742 lb/ft | 5.440 kg/m · 3.656 lb/ft | 6.800 kg/m · 4.569 lb/ft | 8.160 kg/m · 5.483 lb/ft | 10.880 kg/m · 7.311 lb/ft | 13.600 kg/m · 9.139 lb/ft |
| 100 mm | 2.550 kg/m · 1.714 lb/ft | 3.400 kg/m · 2.285 lb/ft | 4.250 kg/m · 2.856 lb/ft | 5.100 kg/m · 3.427 lb/ft | 6.800 kg/m · 4.569 lb/ft | 8.500 kg/m · 5.712 lb/ft | 10.200 kg/m · 6.854 lb/ft | 13.600 kg/m · 9.139 lb/ft | 17.000 kg/m · 11.423 lb/ft |
Rows: width (mm). Columns: thickness (mm). Computed for Brass C36000 at 8500 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. Brass C36000 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 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
Lead content (typically 2.5–3.7 %) restricts use in potable water. Typical density range 8,400–8,700 kg/m³ by composition.
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
Brass 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 brass c36000 flat bar weigh?
At the reference dimensions (w = 50 mm, t = 6 mm) a brass c36000 flat bar of this size weighs 2.550 kg/m, or 1.714 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 brass c36000's density of 8,500 kg/m³ gives 2.550 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 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 1.0828× 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 brass flat 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 flat 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 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
- HDPE flat bar — 960 kg/m³
- PVC flat bar — 1400 kg/m³
- AL 5052 flat bar — 2680 kg/m³
Other Brass sections
The same density applied to every shape the site covers.
- Brass round bar — A = π/4 · d²
- Brass square bar — A = a²
- Brass hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- Brass plate — A = w · t
- Brass round tube — A = π/4 · (D² − d²), d = D − 2t
- Brass 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 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.