Common context
Common project roles include stair framing, edge members, lintels, equipment supports, girts, headers, and built-up or back-to-back framing.
AISC v16.0 · C shape
C8X18.75
C8X18.75 weighs 18.75 lb/ft, has a depth of 8 in, a cross-sectional area of 5.51 in², and an x-axis elastic section modulus Sx of 11 in³. Open the full US customary property record or generate 2D, data, report, and 3D reference files locally in your browser.
Nominal profile
Units · inches
Building nominal profile…
- Weight
- 18.75 lb/ft
- Area
- 5.51 in²
- Depth
- 8 in
- Elastic Sx
- 11 in³
From designation to geometry
Reading the C8X18.75 record
The 8 in depth series in C8X18.75 is a designation. The tabulated depth d is 8 in and flange width bf is 2.53 in. The separately listed detailing depth ddet is 8 in.
The web thickness tw is 0.487 in and flange thickness tf is 0.39 in. This open channel also has centroid x = 0.565 in and shear-center offset eo = 0.431 in; preserve the toe direction and source axis convention when using those values.
Ix = 43.9 in⁴ and Iy = 1.97 in⁴ refer to the database x- and y-axes. Here Ix is numerically larger. Axis letters are labels, not a guarantee that x is always the larger axis. These are geometric properties, not allowable loads or complete member capacities.
Match the axis and dimension conventions to the figures in the AISC v16.0 workbook Readme. The profile above simplifies manufacturing geometry; its outline is not used to recalculate the published properties.
Worked quantity example
Nominal weight for C8X18.75
Assume 3 pieces, each 20 ft (6.096 m) long. This is a hypothetical quantity example, not a stock-length or lifting recommendation.
| Quantity | Calculation | Nominal pounds | Kilogram equivalent |
|---|---|---|---|
| One 20 ft piece | 20 ft × 18.75 lb/ft | 375 lb | 170.097 kg |
| 3 pieces | 3 × 375 lb | 1,125 lb | 510.291 kg |
Conversion: 1 lb = 0.45359237 kg; displayed results are rounded. This multiplication excludes connection plates, bolts, weld metal, coatings, cutting allowances and actual material variation. Use the material takeoff for your own lengths and quantities.
Shape family context
What is a American Standard channel?
A C-shape is a hot-rolled channel with one web and two flanges on the same side. Its singly symmetric, open geometry makes orientation, eccentricity, and torsion important considerations.
Learn how shape properties workDetailing watch
Check toe direction, gage and bolt access, flange slope where applicable, connection eccentricity, web orientation, and whether paired channels require separation or intermediate connectors.
Portable reference files
Download C8X18.75 your way.
Every file is generated locally in your browser from the same nominal profile and AISC v16.0 reference record.
CAD, vector, and image
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Tables and portable data
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Extrude a nominal member
Enter a member length in inches. Mesh files are generated from the nominal reference profile.
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Dimensions & properties
C8X18.75 reference data.
Values below are derived from the AISC Shapes Database v16.0 in US customary units. A dash indicates that a property is not applicable or not included for this family.
Nominal dimensions
- W Nominal weight
- 18.75 lb/ft
- A Area
- 5.51 in²
- d Depth / angle leg dimension d
- 8 in
- ddet Detailing depth
- 8 in
- bf Flange width
- 2.53 in
- bfdet Detailing flange width
- 2.5 in
- tw Web thickness
- 0.487 in
- twdet Detailing web thickness
- 0.5 in
- tf Flange thickness
- 0.39 in
- tfdet Detailing flange thickness
- 0.375 in
- kdes Design k distance
- 0.938 in
- kdet Detailing k distance
- 0.938 in
Centroid & detailing
- x Centroid x
- 0.565 in
- eo Shear-center offset
- 0.431 in
- xp Plastic neutral axis x
- 0.344 in
- T Detailing T distance
- 6.125 in
- WGi Workable gage, inner
- 1.5 in
X-axis properties
- Ix X-axis moment of inertia
- 43.9 in⁴
- Zx X-axis plastic section modulus
- 13.9 in³
- Sx X-axis elastic section modulus
- 11 in³
- rx X-axis radius of gyration
- 2.82 in
- rts Effective radius of gyration
- 0.8 in
- ho Flange centroid distance
- 7.61 in
Y- and z-axis properties
- Iy Y-axis moment of inertia
- 1.97 in⁴
- Zy Y-axis plastic section modulus
- 2.17 in³
- Sy Y-axis elastic section modulus
- 1.01 in³
- ry Y-axis radius of gyration
- 0.598 in
Torsion, warping & perimeters
- J Torsional constant
- 0.434 in⁴
- Cw Warping constant
- 25.1 in⁶
- PA Shape perimeter PA
- 22.6 in
- PB Shape perimeter PB
- 25.1 in
- PC Shape perimeter PC
- 18.5 in
- PD Shape perimeter PD
- 21.1 in
Compare published reference values
C8X18.75 alongside nearby C records
These records share the same nominal series, outside envelope or leg arrangement, depending on the family. Peers are ordered by absolute weight difference, then listed depth and designation. The table does not rank structural performance or approve a substitution.
| Record | Weight (lb/ft) | Depth (in) | Area (in²) | Ix (in⁴) | Iy (in⁴) |
|---|---|---|---|---|---|
| C8X18.75 (this record) | 18.75 | 8 | 5.51 | 43.9 | 1.97 |
| C8X13.75 | 13.75 | 8 | 4.03 | 36.1 | 1.52 |
| C8X11.5 | 11.5 | 8 | 3.37 | 32.5 | 1.31 |
Relative to C8X18.75, C8X13.75 changes nominal weight by -5 lb/ft, listed depth by 0 in, and area by -1.48 in². At the same hypothetical 20 ft length, the nominal weight difference is -100 lb.
Open these records in the full comparison tool
Compare the remaining dimensions, axis conventions, grade, availability and project requirements separately. Weight or section-property similarity does not establish matching connection geometry or member capacity.
Data is derived from the AISC Shapes Database v16.0, consistent with the AISC Steel Construction Manual, 16th Edition, 1st Printing. AISC advises professional verification before use in a specific application. The downloadable DXF is a nominal reference profile and may simplify rolled fillets, flange tapers, angle radii, HSS corner radii, and other manufacturing geometry. Verify all dimensions and suitability before design, detailing, ordering, or fabrication.
From reference to deliverable