C8x11.5 weight and dimensions
17.1 kg/m · 11.50 lb/ft
C8x11.5 is a 203 mm deep channel with a 57.4 mm flange, 5.59 mm web and 9.91 mm flange thickness. It weighs 17.1 kg per metre (11.50 lb/ft). It belongs to the C-channel series, American (AISC / ASTM A6).
C8x11.5 weight calculator
Weight of standard lengths
| Pieces | 20 ft each (lb) | 40 ft each (lb) |
|---|---|---|
| 1 | 229.8 | 459.6 |
| 5 | 1,149.1 | 2,298.1 |
| 10 | 2,298.1 | 4,596.3 |
| 20 | 4,596.3 | 9,192.5 |
| 50 | 11,490.7 | 22,981.3 |
Pieces per ton
| 20 ft lengths per short ton (2,000 lb) | 8.7 |
| 40 ft lengths per short ton (2,000 lb) | 4.4 |
| Length per ton | 174.1 ft |
Useful for converting a tonnage order into a number of bars.
Surface area for painting
| Per metre of length | 0.612 m²/m |
| Per foot of length | 2.01 ft²/ft |
| Per tonne of steel | 35.8 m²/t |
| A 12 m length | 7.34 m² |
Outside perimeter × length, all faces (AISC perimeter PB). Use it to estimate paint, primer, fireproofing or galvanizing quantities.
Cross-section
Drawn to scale. Dimensions in mm.
Dimensions
| Depth h | 203 mm | 7.992 in |
| Flange width b | 57.4 mm | 2.260 in |
| Web thickness tw | 5.59 mm | 0.220 in |
| Flange thickness tf | 9.91 mm | 0.390 in |
| Root radius r | 13.9 mm | 0.547 in |
| Mass | 17.1 kg/m | 11.50 lb/ft |
Section properties
| Property | Value | Unit |
|---|---|---|
| Area | 21.70 | cm² |
| Moment of inertia Ix | 1,350 | cm⁴ |
| Moment of inertia Iy | 54.50 | cm⁴ |
| Elastic modulus Zx | 133 | cm³ |
| Elastic modulus Zy | 12.70 | cm³ |
| Plastic modulus Zpx | 158 | cm³ |
| Plastic modulus Zpy | 25.70 | cm³ |
| Radius of gyration rx | 7.90 | cm |
| Radius of gyration ry | 1.58 | cm |
| Torsion constant J | 5.41 | cm⁴ |
Equivalent sections in other standards
The closest sections by depth and weight. They are not direct substitutes: check bending, buckling and connection details before swapping one for another.
C8x11.5 and its closest equivalents, drawn over each other at the same scale.
| Section | Standard | Depth (mm) | kg/m | Weight vs C8x11.5 |
|---|---|---|---|---|
| C8x11.5 | AISC | 203 | 17.1 | — |
| ISMC 200 | IS | 200 | 22.30 | +30.4% |
| ISMC 175 | IS | 175 | 19.60 | +14.6% |
| UPN 180 | EN | 180 | 21.94 | +28.3% |
C8 series weights
Next heavier: C8x13.75 (20.5 kg/m).
Stiffness and strength per kilogram
The elastic section modulus Zx governs bending strength. Dividing it by the weight shows how efficiently each size uses its steel: higher is better when weight is the cost driver.
| Section | kg/m | Ix (cm⁴) | Zx (cm³) | Zx per kg/m |
|---|---|---|---|---|
| C8x11.5 | 17.10 | 1,350 | 133.0 | 7.78 |
| C8x13.75 | 20.50 | 1,500 | 148.0 | 7.22 |
| C8x18.75 | 27.90 | 1,830 | 180.0 | 6.45 |
Full table: C and MC channel chart (PDF).
How the weight is calculated
Mass per metre = cross-sectional area × density of steel = 21.70 cm² × 0.785 kg/(cm²·m) = 17.03 kg/m.
Rolled sections are made to a nominal mass, and the actual mass can differ by a few percent within the tolerances of ASTM A6. For purchasing, invoicing by weight or checking deliveries, use the producer's stated mass.
Typical uses
Channels are used as purlins, girts, stair stringers, trimmers, frames and bracing, and back to back as built-up columns.
Frequently asked questions
What is the weight of C8x11.5 per metre?
C8x11.5 weighs 17.1 kg/m, which is 11.50 lb/ft.
How much does a 6 m or 12 m length of C8x11.5 weigh?
A 6 m length weighs about 102.6 kg and a 12 m length about 205.2 kg.
What is the equivalent of C8x11.5 in other standards?
By depth and weight the closest match is ISMC 200 (22.3 kg/m, 200 mm deep). Check section properties before substituting one for the other.
Source: AISC Shapes Database v16.0. Values are nominal; verify with the producer before ordering.