Common context
Common project roles include beams, monorails, crane-related or industrial framing, and existing-building work where the S series is specified or matched.
AISC v16.0 · S shape
S24X121
S24X121 weighs 121 lb/ft, has a depth of 24.5 in, a cross-sectional area of 35.5 in², and an x-axis elastic section modulus Sx of 258 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
- 121 lb/ft
- Area
- 35.5 in²
- Depth
- 24.5 in
- Elastic Sx
- 258 in³
From designation to geometry
Reading the S24X121 record
The 24 in depth series in S24X121 is a designation. The tabulated depth d is 24.5 in and flange width bf is 8.05 in. The separately listed detailing depth ddet is 24.5 in.
The web thickness tw is 0.8 in and flange thickness tf is 1.09 in. Keep the exact designation with these dimensions: matching the depth series does not guarantee matching flanges, web geometry or connection fit.
Ix = 3,160 in⁴ and Iy = 83 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 S24X121
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 × 121 lb/ft | 2,420 lb | 1,097.694 kg |
| 3 pieces | 3 × 2,420 lb | 7,260 lb | 3,293.081 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 beam?
An S-shape is a hot-rolled, doubly symmetric beam with proportions and flange geometry different from a W-shape. It is identified by nominal depth and weight per foot.
Learn how shape properties workDetailing watch
Check tapered flange geometry, connection surface, gage, fit-up, availability, and avoid substituting a W-shape solely because depth and weight appear similar.
Portable reference files
Download S24X121 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
Use the profile in CAD, illustration, plotting, reports, or presentations.
Tables and portable data
Take a printable datasheet, spreadsheet, structured record, or plain-text table.
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
S24X121 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
- 121 lb/ft
- A Area
- 35.5 in²
- d Depth / angle leg dimension d
- 24.5 in
- ddet Detailing depth
- 24.5 in
- bf Flange width
- 8.05 in
- bfdet Detailing flange width
- 8 in
- tw Web thickness
- 0.8 in
- twdet Detailing web thickness
- 0.813 in
- tf Flange thickness
- 1.09 in
- tfdet Detailing flange thickness
- 1.063 in
- kdes Design k distance
- 2 in
- kdet Detailing k distance
- 2 in
Centroid & detailing
- T Detailing T distance
- 20.5 in
- WGi Workable gage, inner
- 4 in
X-axis properties
- Ix X-axis moment of inertia
- 3,160 in⁴
- Zx X-axis plastic section modulus
- 306 in³
- Sx X-axis elastic section modulus
- 258 in³
- rx X-axis radius of gyration
- 9.43 in
- rts Effective radius of gyration
- 1.94 in
- ho Flange centroid distance
- 23.4 in
Y- and z-axis properties
- Iy Y-axis moment of inertia
- 83 in⁴
- Zy Y-axis plastic section modulus
- 36.3 in³
- Sy Y-axis elastic section modulus
- 20.6 in³
- ry Y-axis radius of gyration
- 1.53 in
Torsion, warping & perimeters
- J Torsional constant
- 12.8 in⁴
- Cw Warping constant
- 11,400 in⁶
- PA Shape perimeter PA
- 68.6 in
- PB Shape perimeter PB
- 76.6 in
- PC Shape perimeter PC
- 57.1 in
- PD Shape perimeter PD
- 65.1 in
Compare published reference values
S24X121 alongside nearby S 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) |
|---|---|---|---|---|---|
| S24X121 (this record) | 121 | 24.5 | 35.5 | 3,160 | 83 |
| S24X106 | 106 | 24.5 | 31.1 | 2,940 | 76.8 |
| S24X100 | 100 | 24 | 29.3 | 2,380 | 47.4 |
Relative to S24X121, S24X106 changes nominal weight by -15 lb/ft, listed depth by 0 in, and area by -4.4 in². At the same hypothetical 20 ft length, the nominal weight difference is -300 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