Bronze C93200 Flat Bar Weight
Mass per metre and per foot for bronze c93200 flat bar 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 15.8 kg (35.5 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 2.640 kg/m (1.774 lb/ft). Against carbon steel's 7,850 kg/m³ that is +12.1 % — 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 8,800 kg/m³ that is 2.6400 kg/m for the reference size above.
Bronze flat bar — size series
| Width | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10 | 12 | 16 | 20 |
|---|---|---|---|---|---|---|---|---|---|
| 12 mm | 0.317 kg/m · 0.213 lb/ft | 0.422 kg/m · 0.284 lb/ft | 0.528 kg/m · 0.355 lb/ft | 0.634 kg/m · 0.426 lb/ft | 0.845 kg/m · 0.568 lb/ft | 1.056 kg/m · 0.710 lb/ft | 1.267 kg/m · 0.852 lb/ft | 1.690 kg/m · 1.135 lb/ft | 2.112 kg/m · 1.419 lb/ft |
| 16 mm | 0.422 kg/m · 0.284 lb/ft | 0.563 kg/m · 0.378 lb/ft | 0.704 kg/m · 0.473 lb/ft | 0.845 kg/m · 0.568 lb/ft | 1.126 kg/m · 0.757 lb/ft | 1.408 kg/m · 0.946 lb/ft | 1.690 kg/m · 1.135 lb/ft | 2.253 kg/m · 1.514 lb/ft | 2.816 kg/m · 1.892 lb/ft |
| 20 mm | 0.528 kg/m · 0.355 lb/ft | 0.704 kg/m · 0.473 lb/ft | 0.880 kg/m · 0.591 lb/ft | 1.056 kg/m · 0.710 lb/ft | 1.408 kg/m · 0.946 lb/ft | 1.760 kg/m · 1.183 lb/ft | 2.112 kg/m · 1.419 lb/ft | 2.816 kg/m · 1.892 lb/ft | 3.520 kg/m · 2.365 lb/ft |
| 25 mm | 0.660 kg/m · 0.443 lb/ft | 0.880 kg/m · 0.591 lb/ft | 1.100 kg/m · 0.739 lb/ft | 1.320 kg/m · 0.887 lb/ft | 1.760 kg/m · 1.183 lb/ft | 2.200 kg/m · 1.478 lb/ft | 2.640 kg/m · 1.774 lb/ft | 3.520 kg/m · 2.365 lb/ft | 4.400 kg/m · 2.957 lb/ft |
| 30 mm | 0.792 kg/m · 0.532 lb/ft | 1.056 kg/m · 0.710 lb/ft | 1.320 kg/m · 0.887 lb/ft | 1.584 kg/m · 1.064 lb/ft | 2.112 kg/m · 1.419 lb/ft | 2.640 kg/m · 1.774 lb/ft | 3.168 kg/m · 2.129 lb/ft | 4.224 kg/m · 2.838 lb/ft | 5.280 kg/m · 3.548 lb/ft |
| 40 mm | 1.056 kg/m · 0.710 lb/ft | 1.408 kg/m · 0.946 lb/ft | 1.760 kg/m · 1.183 lb/ft | 2.112 kg/m · 1.419 lb/ft | 2.816 kg/m · 1.892 lb/ft | 3.520 kg/m · 2.365 lb/ft | 4.224 kg/m · 2.838 lb/ft | 5.632 kg/m · 3.785 lb/ft | 7.040 kg/m · 4.731 lb/ft |
| 50 mm | 1.320 kg/m · 0.887 lb/ft | 1.760 kg/m · 1.183 lb/ft | 2.200 kg/m · 1.478 lb/ft | 2.640 kg/m · 1.774 lb/ft | 3.520 kg/m · 2.365 lb/ft | 4.400 kg/m · 2.957 lb/ft | 5.280 kg/m · 3.548 lb/ft | 7.040 kg/m · 4.731 lb/ft | 8.800 kg/m · 5.913 lb/ft |
| 60 mm | 1.584 kg/m · 1.064 lb/ft | 2.112 kg/m · 1.419 lb/ft | 2.640 kg/m · 1.774 lb/ft | 3.168 kg/m · 2.129 lb/ft | 4.224 kg/m · 2.838 lb/ft | 5.280 kg/m · 3.548 lb/ft | 6.336 kg/m · 4.258 lb/ft | 8.448 kg/m · 5.677 lb/ft | 10.560 kg/m · 7.096 lb/ft |
| 80 mm | 2.112 kg/m · 1.419 lb/ft | 2.816 kg/m · 1.892 lb/ft | 3.520 kg/m · 2.365 lb/ft | 4.224 kg/m · 2.838 lb/ft | 5.632 kg/m · 3.785 lb/ft | 7.040 kg/m · 4.731 lb/ft | 8.448 kg/m · 5.677 lb/ft | 11.264 kg/m · 7.569 lb/ft | 14.080 kg/m · 9.461 lb/ft |
| 100 mm | 2.640 kg/m · 1.774 lb/ft | 3.520 kg/m · 2.365 lb/ft | 4.400 kg/m · 2.957 lb/ft | 5.280 kg/m · 3.548 lb/ft | 7.040 kg/m · 4.731 lb/ft | 8.800 kg/m · 5.913 lb/ft | 10.560 kg/m · 7.096 lb/ft | 14.080 kg/m · 9.461 lb/ft | 17.600 kg/m · 11.827 lb/ft |
Rows: width (mm). Columns: thickness (mm). Computed for Bronze C93200 at 8800 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. 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 | 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 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 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
Bronze 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 bronze c93200 flat bar weigh?
At the reference dimensions (w = 50 mm, t = 6 mm) a bronze c93200 flat bar of this size weighs 2.640 kg/m, or 1.774 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 bronze c93200's density of 8,800 kg/m³ gives 2.640 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 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 1.1210× 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 bronze flat bar 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 flat bar 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 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
- Brass flat bar — 8500 kg/m³
- HDPE flat bar — 960 kg/m³
- PVC flat bar — 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 plate — A = w · t
- Bronze round tube — A = π/4 · (D² − d²), d = D − 2t
- 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
Flat Bar area from A = w · t. 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.