Bronze C93200 Round Tube Weight
Mass per metre and per foot for bronze c93200 round tube at 8,800 kg/m³ (ASTM B505 (UNS C93200, bearing bronze)). Every figure is for the section as drawn. A 6 m length of this size weighs 23.4 kg (52.4 lb per 20 ft).
At the reference dimensions (D = 50 mm, t = 3 mm) this section has a cross-sectional area of 443.0 mm², giving 3.898 kg/m (2.619 lb/ft). Against carbon steel's 7,850 kg/m³ that is +12.1 % — the same section in steel would be 3.477 kg/m.
Round Tube — formula and derivation
Area of a round tube
A = π/4 · (D² − d²), d = D − 2t
A = π/4 × (D² − d²), where D is the outside diameter, d the inside diameter, and d = D − 2t for wall thickness t
Worked through with the default dimensions:
A = π/4 × (D² − d²)d = 50 − 2 × 3 = 44.0 mmA = 0.785398 × (50² − 44.0²)A = 0.785398 × 564.0A = 443.0 mm²
- D
- Outside diameter
- t
- Wall thickness — Must be less than half the outside diameter.
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 8,800 kg/m³ that is 3.8981 kg/m for the reference size above.
Bronze round tube — size series
| Outside diameter | 1.0 | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 |
|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.304 kg/m · 0.204 lb/ft | 0.435 kg/m · 0.293 lb/ft | 0.553 kg/m · 0.372 lb/ft | 0.746 kg/m · 0.502 lb/ft | 0.885 kg/m · 0.594 lb/ft | 0.968 kg/m · 0.650 lb/ft | 0.995 kg/m · 0.669 lb/ft | 0.885 kg/m · 0.594 lb/ft |
| 16 mm | 0.415 kg/m · 0.279 lb/ft | 0.601 kg/m · 0.404 lb/ft | 0.774 kg/m · 0.520 lb/ft | 1.078 kg/m · 0.725 lb/ft | 1.327 kg/m · 0.892 lb/ft | 1.521 kg/m · 1.022 lb/ft | 1.659 kg/m · 1.115 lb/ft | 1.769 kg/m · 1.189 lb/ft |
| 20 mm | 0.525 kg/m · 0.353 lb/ft | 0.767 kg/m · 0.516 lb/ft | 0.995 kg/m · 0.669 lb/ft | 1.410 kg/m · 0.947 lb/ft | 1.769 kg/m · 1.189 lb/ft | 2.073 kg/m · 1.393 lb/ft | 2.322 kg/m · 1.560 lb/ft | 2.654 kg/m · 1.783 lb/ft |
| 25 mm | 0.664 kg/m · 0.446 lb/ft | 0.975 kg/m · 0.655 lb/ft | 1.272 kg/m · 0.855 lb/ft | 1.825 kg/m · 1.226 lb/ft | 2.322 kg/m · 1.560 lb/ft | 2.765 kg/m · 1.858 lb/ft | 3.152 kg/m · 2.118 lb/ft | 3.760 kg/m · 2.527 lb/ft |
| 32 mm | 0.857 kg/m · 0.576 lb/ft | 1.265 kg/m · 0.850 lb/ft | 1.659 kg/m · 1.115 lb/ft | 2.405 kg/m · 1.616 lb/ft | 3.096 kg/m · 2.081 lb/ft | 3.732 kg/m · 2.508 lb/ft | 4.313 kg/m · 2.898 lb/ft | 5.308 kg/m · 3.567 lb/ft |
| 40 mm | 1.078 kg/m · 0.725 lb/ft | 1.597 kg/m · 1.073 lb/ft | 2.101 kg/m · 1.412 lb/ft | 3.069 kg/m · 2.062 lb/ft | 3.981 kg/m · 2.675 lb/ft | 4.838 kg/m · 3.251 lb/ft | 5.640 kg/m · 3.790 lb/ft | 7.077 kg/m · 4.756 lb/ft |
| 50 mm | 1.355 kg/m · 0.910 lb/ft | 2.011 kg/m · 1.351 lb/ft | 2.654 kg/m · 1.783 lb/ft | 3.898 kg/m · 2.619 lb/ft | 5.087 kg/m · 3.418 lb/ft | 6.220 kg/m · 4.180 lb/ft | 7.299 kg/m · 4.904 lb/ft | 9.289 kg/m · 6.242 lb/ft |
| 63 mm | 1.714 kg/m · 1.152 lb/ft | 2.550 kg/m · 1.714 lb/ft | 3.373 kg/m · 2.266 lb/ft | 4.976 kg/m · 3.344 lb/ft | 6.524 kg/m · 4.384 lb/ft | 8.017 kg/m · 5.387 lb/ft | 9.455 kg/m · 6.353 lb/ft | 12.164 kg/m · 8.174 lb/ft |
| 76 mm | 2.073 kg/m · 1.393 lb/ft | 3.089 kg/m · 2.076 lb/ft | 4.092 kg/m · 2.749 lb/ft | 6.054 kg/m · 4.068 lb/ft | 7.962 kg/m · 5.350 lb/ft | 9.814 kg/m · 6.595 lb/ft | 11.611 kg/m · 7.802 lb/ft | 15.039 kg/m · 10.106 lb/ft |
| 89 mm | 2.433 kg/m · 1.635 lb/ft | 3.629 kg/m · 2.438 lb/ft | 4.810 kg/m · 3.232 lb/ft | 7.133 kg/m · 4.793 lb/ft | 9.400 kg/m · 6.316 lb/ft | 11.611 kg/m · 7.802 lb/ft | 13.768 kg/m · 9.251 lb/ft | 17.915 kg/m · 12.038 lb/ft |
| 114 mm | 3.124 kg/m · 2.099 lb/ft | 4.665 kg/m · 3.135 lb/ft | 6.193 kg/m · 4.161 lb/ft | 9.206 kg/m · 6.186 lb/ft | 12.164 kg/m · 8.174 lb/ft | 15.067 kg/m · 10.125 lb/ft | 17.915 kg/m · 12.038 lb/ft | 23.444 kg/m · 15.754 lb/ft |
| 168 mm | 4.617 kg/m · 3.102 lb/ft | 6.905 kg/m · 4.640 lb/ft | 9.178 kg/m · 6.168 lb/ft | 13.685 kg/m · 9.196 lb/ft | 18.136 kg/m · 12.187 lb/ft | 22.532 kg/m · 15.140 lb/ft | 26.872 kg/m · 18.057 lb/ft | 35.387 kg/m · 23.779 lb/ft |
Rows: outside diameter (mm). Columns: wall thickness (mm). Computed for Bronze C93200 at 8800 kg/m³.
| Outside diameter | 1.0 | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 |
|---|---|---|---|---|---|---|---|---|
| 12 mm | 34.6 | 49.5 | 62.8 | 84.8 | 100.5 | 110.0 | 113.1 | 100.5 |
| 16 mm | 47.1 | 68.3 | 88.0 | 122.5 | 150.8 | 172.8 | 188.5 | 201.1 |
| 20 mm | 59.7 | 87.2 | 113.1 | 160.2 | 201.1 | 235.6 | 263.9 | 301.6 |
| 25 mm | 75.4 | 110.7 | 144.5 | 207.3 | 263.9 | 314.2 | 358.1 | 427.3 |
| 32 mm | 97.4 | 143.7 | 188.5 | 273.3 | 351.9 | 424.1 | 490.1 | 603.2 |
| 40 mm | 122.5 | 181.4 | 238.8 | 348.7 | 452.4 | 549.8 | 640.9 | 804.2 |
| 50 mm | 153.9 | 228.6 | 301.6 | 443.0 | 578.1 | 706.9 | 829.4 | 1,055.6 |
| 63 mm | 194.8 | 289.8 | 383.3 | 565.5 | 741.4 | 911.1 | 1,074.4 | 1,382.3 |
| 76 mm | 235.6 | 351.1 | 465.0 | 688.0 | 904.8 | 1,115.3 | 1,319.5 | 1,709.0 |
| 89 mm | 276.5 | 412.3 | 546.6 | 810.5 | 1,068.1 | 1,319.5 | 1,564.5 | 2,035.8 |
| 114 mm | 355.0 | 530.1 | 703.7 | 1,046.2 | 1,382.3 | 1,712.2 | 2,035.8 | 2,664.1 |
| 168 mm | 524.6 | 784.6 | 1,043.0 | 1,555.1 | 2,060.9 | 2,560.4 | 3,053.6 | 4,021.2 |
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 round tube in every material
Geometry is fixed and only density changes, so this table is the whole material-selection question in one view. Bronze C93200 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 | 3.477 | 2.337 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.544 | 2.381 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.411 | 2.292 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.196 | 0.804 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.187 | 0.798 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.245 | 0.836 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 3.960 | 2.661 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 3.765 | 2.530 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 3.898 | 2.619 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 1.998 | 1.342 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.189 | 2.143 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.023 | 3.375 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.620 | 0.417 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.425 | 0.286 | -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 bronze c93200
Tin-lead bearing bronze, the standard material for plain bushes and wear plates because its microstructure carries a soft lead phase that acts as a built-in lubricant. At 8,800 kg/m³ it sits between copper and brass, and being a cast alloy its density genuinely varies more than the wrought metals — 8,700 to 9,000 kg/m³ is normal across bronze chemistries, so a take-off on a large cast bush should come from the caster’s certificate, not from a table.
- Density
- 8,800 kg/m³ = 0.3179 lb/in³ · 1.1210× carbon steel · typical spread ±3 %
- Specification
- ASTM B505 (UNS C93200, bearing bronze)
- Equivalents
- SAE 660 · EN CW458K · GB ZQSn6-6-3
- Typical uses
- Plain bearings and bushes · Worm gears · Pump and valve components · Wear plates
Cast alloys carry higher density uncertainty than wrought. Typical spread 8,700–9,000 kg/m³.
About round tube
Hollow sections are the most efficient way to buy stiffness by weight, and the numbers are stark: a 50 mm outside diameter tube with a 3 mm wall has the same area as a 22.6 mm solid bar — about 20 % of the mass — but its second moment of area is roughly 2.4 times larger. The catch is local: a thin wall buckles and dents long before it yields, so tube is chosen for stiffness and stability, never for where impact or crushing is expected.
Specified as outside diameter × wall thickness. State the standard (e.g. EN 10219) and whether the tube is welded or seamless.
Download this data
Bronze round tube — 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 bronze c93200 round tube weigh?
At the reference dimensions (D = 50 mm, t = 3 mm) a bronze c93200 round tube of this size weighs 3.898 kg/m, or 2.619 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 round tube calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = π/4 · (D² − d²), d = D − 2t. At the reference dimensions that gives 443.0 mm², and multiplying by bronze c93200's density of 8,800 kg/m³ gives 3.898 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 bronze c93200 weigh more or less than steel?
It is heavier than carbon steel for the same section — about 12 % heavier at 8,800 kg/m³. Density is the only variable: the cross-sectional area depends purely on geometry, so a round tube of the same dimensions has the same area in every material and the mass simply scales with density. In this case the ratio is 1.1210× carbon steel.
What is the cross-sectional area of a round tube?
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 443.0 mm² (0.6866 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 bronze round tube weigh the same as a bronze 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 Bronze weight or carbon steel weight for costing?
Use the material you are actually buying. At 8,800 kg/m³ against carbon steel's 7,850 kg/m³, the same round tube differs by 12.1 % 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 3.477 kg/m for comparison.
Other materials, same round tube
The same geometry in every material, so the only variable is density.
- Carbon steel round tube — 7850 kg/m³
- SS 304 round tube — 8000 kg/m³
- SS 316 round tube — 8000 kg/m³
- AL 6061 round tube — 2700 kg/m³
- Copper round tube — 8940 kg/m³
- Brass round tube — 8500 kg/m³
- HDPE round tube — 960 kg/m³
- PVC round tube — 1400 kg/m³
Other Bronze sections
The same density applied to every shape the site covers.
- Bronze round bar — A = π/4 · d²
- Bronze square bar — A = a²
- Bronze hexagonal bar — A = (√3/2) · AF² ≈ 0.8660 · AF²
- Bronze flat bar — A = w · t
- Bronze plate — A = w · t
- Bronze 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
Round Tube area from A = π/4 · (D² − d²), d = D − 2t. Mass computed as area × length × density at 8,800 kg/m³ (ASTM B505 (UNS C93200, bearing bronze)). 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.