Bronze C93200 Square Tube Weight
Mass per metre and per foot for bronze c93200 square 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 (52.5 lb per 20 ft).
At the reference dimensions (a = 40 mm, t = 3 mm) this section has a cross-sectional area of 444.0 mm², giving 3.907 kg/m (2.626 lb/ft). Against carbon steel's 7,850 kg/m³ that is +12.1 % — the same section in steel would be 3.485 kg/m.
Square Tube — formula and derivation
Area of a square tube
A = a² − (a − 2t)²
A = a² − (a − 2t)², which expands to A = 4t(a − t)
Worked through with the default dimensions:
A = a² − (a − 2t)²Inner side = 40 − 2 × 3 = 34.0 mmA = 40² − 34.0²A = 1600.0 − 1156.0A = 444.0 mm²
- a
- Side
- t
- Wall 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 8,800 kg/m³ that is 3.9072 kg/m for the reference size above.
Bronze square tube — size series
| Side | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 |
|---|---|---|---|---|---|---|
| 15 mm | 0.713 kg/m · 0.479 lb/ft | 0.915 kg/m · 0.615 lb/ft | 1.267 kg/m · 0.852 lb/ft | 1.549 kg/m · 1.041 lb/ft | 1.760 kg/m · 1.183 lb/ft | 1.901 kg/m · 1.277 lb/ft |
| 20 mm | 0.977 kg/m · 0.656 lb/ft | 1.267 kg/m · 0.852 lb/ft | 1.795 kg/m · 1.206 lb/ft | 2.253 kg/m · 1.514 lb/ft | 2.640 kg/m · 1.774 lb/ft | 2.957 kg/m · 1.987 lb/ft |
| 25 mm | 1.241 kg/m · 0.834 lb/ft | 1.619 kg/m · 1.088 lb/ft | 2.323 kg/m · 1.561 lb/ft | 2.957 kg/m · 1.987 lb/ft | 3.520 kg/m · 2.365 lb/ft | 4.013 kg/m · 2.696 lb/ft |
| 30 mm | 1.505 kg/m · 1.011 lb/ft | 1.971 kg/m · 1.325 lb/ft | 2.851 kg/m · 1.916 lb/ft | 3.661 kg/m · 2.460 lb/ft | 4.400 kg/m · 2.957 lb/ft | 5.069 kg/m · 3.406 lb/ft |
| 40 mm | 2.033 kg/m · 1.366 lb/ft | 2.675 kg/m · 1.798 lb/ft | 3.907 kg/m · 2.626 lb/ft | 5.069 kg/m · 3.406 lb/ft | 6.160 kg/m · 4.139 lb/ft | 7.181 kg/m · 4.825 lb/ft |
| 50 mm | 2.561 kg/m · 1.721 lb/ft | 3.379 kg/m · 2.271 lb/ft | 4.963 kg/m · 3.335 lb/ft | 6.477 kg/m · 4.352 lb/ft | 7.920 kg/m · 5.322 lb/ft | 9.293 kg/m · 6.244 lb/ft |
| 60 mm | 3.089 kg/m · 2.076 lb/ft | 4.083 kg/m · 2.744 lb/ft | 6.019 kg/m · 4.045 lb/ft | 7.885 kg/m · 5.298 lb/ft | 9.680 kg/m · 6.505 lb/ft | 11.405 kg/m · 7.664 lb/ft |
| 80 mm | 4.145 kg/m · 2.785 lb/ft | 5.491 kg/m · 3.690 lb/ft | 8.131 kg/m · 5.464 lb/ft | 10.701 kg/m · 7.191 lb/ft | 13.200 kg/m · 8.870 lb/ft | 15.629 kg/m · 10.502 lb/ft |
| 100 mm | 5.201 kg/m · 3.495 lb/ft | 6.899 kg/m · 4.636 lb/ft | 10.243 kg/m · 6.883 lb/ft | 13.517 kg/m · 9.083 lb/ft | 16.720 kg/m · 11.235 lb/ft | 19.853 kg/m · 13.340 lb/ft |
Rows: side (mm). Columns: wall thickness (mm). Computed for Bronze C93200 at 8800 kg/m³.
| Side | 1.5 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 |
|---|---|---|---|---|---|---|
| 15 mm | 81.0 | 104.0 | 144.0 | 176.0 | 200.0 | 216.0 |
| 20 mm | 111.0 | 144.0 | 204.0 | 256.0 | 300.0 | 336.0 |
| 25 mm | 141.0 | 184.0 | 264.0 | 336.0 | 400.0 | 456.0 |
| 30 mm | 171.0 | 224.0 | 324.0 | 416.0 | 500.0 | 576.0 |
| 40 mm | 231.0 | 304.0 | 444.0 | 576.0 | 700.0 | 816.0 |
| 50 mm | 291.0 | 384.0 | 564.0 | 736.0 | 900.0 | 1,056.0 |
| 60 mm | 351.0 | 464.0 | 684.0 | 896.0 | 1,100.0 | 1,296.0 |
| 80 mm | 471.0 | 624.0 | 924.0 | 1,216.0 | 1,500.0 | 1,776.0 |
| 100 mm | 591.0 | 784.0 | 1,164.0 | 1,536.0 | 1,900.0 | 2,256.0 |
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 square 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 | 3.485 | 2.342 | +0.0 % |
| Stainless Steel 304 | 8,000 | 0.2890 | 3.552 | 2.387 | +1.9 % |
| Stainless Steel 316 | 8,000 | 0.2890 | 3.552 | 2.387 | +1.9 % |
| Stainless Steel 316L | 8,000 | 0.2890 | 3.552 | 2.387 | +1.9 % |
| Stainless Steel 430 | 7,700 | 0.2782 | 3.419 | 2.297 | -1.9 % |
| Aluminum 6061-T6 | 2,700 | 0.0975 | 1.199 | 0.806 | -65.6 % |
| Aluminum 5052-H32 | 2,680 | 0.0968 | 1.190 | 0.800 | -65.9 % |
| Aluminum 7075-T6 | 2,810 | 0.1015 | 1.248 | 0.838 | -64.2 % |
| Copper C11000 | 8,940 | 0.3230 | 3.969 | 2.667 | +13.9 % |
| Brass C36000 | 8,500 | 0.3071 | 3.774 | 2.536 | +8.3 % |
| Bronze C93200 | 8,800 | 0.3179 | 3.907 | 2.626 | +12.1 % |
| Titanium Grade 2 | 4,510 | 0.1629 | 2.002 | 1.346 | -42.5 % |
| Gray Cast Iron | 7,200 | 0.2601 | 3.197 | 2.148 | -8.3 % |
| Lead | 11,340 | 0.4097 | 5.035 | 3.383 | +44.5 % |
| Rigid PVC (Type I) | 1,400 | 0.0506 | 0.622 | 0.418 | -82.2 % |
| HDPE (PE 100) | 960 | 0.0347 | 0.426 | 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 square tube
Square tube expands cleanly to A = 4t(a − t), which makes the sensitivity obvious: for a given side, weight is almost exactly linear in wall thickness. Doubling a 2 mm wall to 4 mm adds about 1.9 times the mass, not twice, because the inner void shrinks as the wall grows. Its flat faces also make it the natural choice for welded frames and for anything that has to be drilled, tapped or bolted through a face — a round tube gives you only a tangent point where a square tube gives you a full flat.
Specified as side × wall thickness. Corner radii are standardised per EN 10219 and change the area slightly at heavier walls.
Download this data
Bronze square 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 square tube weigh?
At the reference dimensions (a = 40 mm, t = 3 mm) a bronze c93200 square tube of this size weighs 3.907 kg/m, or 2.626 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 square tube calculated?
Weight is cross-sectional area × length × density. For this shape the area is A = a² − (a − 2t)². At the reference dimensions that gives 444.0 mm², and multiplying by bronze c93200's density of 8,800 kg/m³ gives 3.907 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 square 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 square 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 444.0 mm² (0.6882 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 square 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 square 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 3.485 kg/m for comparison.
Other materials, same square tube
The same geometry in every material, so the only variable is density.
- Carbon steel square tube — 7850 kg/m³
- SS 304 square tube — 8000 kg/m³
- SS 316 square tube — 8000 kg/m³
- AL 6061 square tube — 2700 kg/m³
- Copper square tube — 8940 kg/m³
- Brass square tube — 8500 kg/m³
- HDPE square tube — 960 kg/m³
- PVC square 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 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
Square Tube area from A = a² − (a − 2t)². 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.