C12x25 is an American Standard steel channel (C shape) that is 12 in deep with a 3.05 in flange and weighs 25 lb/ft (37 kg/m). Its metric designation is C310x37. All values below come from the AISC Shapes Database v16.0.
C12x25 Channel Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 25 lb/ft | 37 kg/m |
| Cross-sectional area | A | 7.34 inยฒ | 4,740 mmยฒ |
| Depth | d | 12 in | 305 mm |
| Flange width | bf | 3.05 in | 77.5 mm |
| Web thickness | tw | 0.387 in | 9.83 mm |
| Average flange thickness | tf | 0.501 in | 12.7 mm |
| Distance to web toe of fillet (design) | kdes | 1.13 in | 28.7 mm |
| Distance to web toe of fillet (detailing) | kdet | 1.125 in | 28.6 mm |
| Distance between web toes of fillets | T | 9.75 in | 248 mm |
| Workable gage | WGi | 1.75 in | 44.5 mm |
| Centroid distance from back of web | xฬ | 0.674 in | 17.1 mm |
| Shear center distance from web centerline | eo | 0.746 in | 18.9 mm |
C12x25 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 144 inโด | 59.9 ร10โถ mmโด |
| Elastic section modulus, x-axis | Sx | 24 inยณ | 393 ร10ยณ mmยณ |
| Plastic section modulus, x-axis | Zx | 29.4 inยณ | 482 ร10ยณ mmยณ |
| Radius of gyration, x-axis | rx | 4.43 in | 113 mm |
| Moment of inertia, y-axis | Iy | 4.45 inโด | 1.85 ร10โถ mmโด |
| Elastic section modulus, y-axis | Sy | 1.87 inยณ | 30.6 ร10ยณ mmยณ |
| Plastic section modulus, y-axis | Zy | 3.82 inยณ | 62.6 ร10ยณ mmยณ |
| Radius of gyration, y-axis | ry | 0.779 in | 19.8 mm |
| Torsional constant | J | 0.538 inโด | 224 ร10ยณ mmโด |
| Warping constant | Cw | 130 inโถ | 34.9 ร10โน mmโถ |
| Polar radius of gyration about shear center | rฬo | 4.72 in | 120 mm |
C12x25 Channel Weight Calculator
Enter a length to get the total weight of a C12x25 channel. A 20 ft length weighs 500 lb.
Uses the AISC nominal weight: 25 lb/ft (37 kg/m).
Channels Similar to C12x25
Other AISC channels with a nominal depth of 12 in:
| Shape | Weight (lb/ft) | Depth (in) | Flange width (in) | Web (in) |
|---|---|---|---|---|
| C12x20.7 | 20.7 | 12 | 2.94 | 0.282 |
| C12x30 | 30 | 12 | 3.17 | 0.51 |
| MC12x10.6 | 10.6 | 12 | 1.5 | 0.19 |
| MC12x14.3 | 14.3 | 12 | 2.12 | 0.25 |
| MC12x31 | 31 | 12 | 3.67 | 0.37 |
| MC12x35 | 35 | 12 | 3.77 | 0.465 |
| MC12x40 | 40 | 12 | 3.89 | 0.59 |
| MC12x45 | 45 | 12 | 4.01 | 0.71 |
| MC12x50 | 50 | 12 | 4.14 | 0.835 |
See every standard channel in the C-channel sizes chart, or the MC channel dimensions chart for miscellaneous channels.
C12x25 Channel FAQ
What does C12x25 mean?
C means American Standard channel. The first number (12) is the nominal depth in inches, and the second number (25) is the weight in pounds per foot. The actual depth of C12x25 is 12 in.
How much does a C12x25 channel weigh?
C12x25 weighs 25 lb per foot (37 kg per meter). A 20 ft length weighs about 500 lb.
What is the metric equivalent of C12x25?
The metric (SI) designation is C310x37: 305 mm deep with a 77.5 mm flange and 37 kg/m.
Where is the centroid of a C12x25 channel?
A channel is not symmetric about its vertical axis. The centroid of C12x25 sits 0.674 in (17.1 mm) from the back of the web, and the shear center is 0.746 in from the web centerline, on the side away from the flanges.
What size load can a C12x25 channel carry?
Capacity depends on the span, load, bracing, connections and local building code, so it cannot be read from a size table. A licensed structural engineer must size any channel that carries a load.
Source: AISC Shapes Database v16.0, consistent with the AISC Steel Construction Manual, 16th Edition. Last updated: September 2026.
This page is reference information only and is not engineering advice. Do not use it for a specific design without verification by a licensed engineer or architect. Full disclaimer.