Common context
Common project roles include specialty edge framing, equipment and industrial supports, stair or platform framing, and conditions requiring a particular channel proportion.
AISC v16.0 · MC shape
MC3X7.1
MC3X7.1 weighs 7.1 lb/ft, has a depth of 3 in, a cross-sectional area of 2.11 in², and an x-axis elastic section modulus Sx of 1.81 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
- 7.1 lb/ft
- Area
- 2.11 in²
- Depth
- 3 in
- Elastic Sx
- 1.81 in³
From designation to geometry
Reading the MC3X7.1 record
The 3 in depth series in MC3X7.1 is a designation. The tabulated depth d is 3 in and flange width bf is 1.94 in. The separately listed detailing depth ddet is 3 in.
The web thickness tw is 0.312 in and flange thickness tf is 0.351 in. This open channel also has centroid x = 0.653 in and shear-center offset eo = 0.574 in; preserve the toe direction and source axis convention when using those values.
Ix = 2.72 in⁴ and Iy = 0.666 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 MC3X7.1
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 × 7.1 lb/ft | 142 lb | 64.41 kg |
| 3 pieces | 3 × 142 lb | 426 lb | 193.23 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 miscellaneous channel?
An MC-shape is a hot-rolled miscellaneous channel whose proportions differ from the standard C series. It remains an open, singly symmetric section and should be identified by its exact designation and properties.
Learn how shape properties workDetailing watch
Do not substitute a C-shape from nominal depth alone. Verify exact flange, web, gage, slope, availability, and connection geometry from the controlling record.
Portable reference files
Download MC3X7.1 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.
One-click package
Complete 2D + data bundle
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Dimensions & properties
MC3X7.1 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
- 7.1 lb/ft
- A Area
- 2.11 in²
- d Depth / angle leg dimension d
- 3 in
- ddet Detailing depth
- 3 in
- bf Flange width
- 1.94 in
- bfdet Detailing flange width
- 2 in
- tw Web thickness
- 0.312 in
- twdet Detailing web thickness
- 0.313 in
- tf Flange thickness
- 0.351 in
- tfdet Detailing flange thickness
- 0.375 in
- kdes Design k distance
- 0.813 in
- kdet Detailing k distance
- 0.813 in
Centroid & detailing
- x Centroid x
- 0.653 in
- eo Shear-center offset
- 0.574 in
- xp Plastic neutral axis x
- 0.414 in
- T Detailing T distance
- 1.375 in
X-axis properties
- Ix X-axis moment of inertia
- 2.72 in⁴
- Zx X-axis plastic section modulus
- 2.24 in³
- Sx X-axis elastic section modulus
- 1.81 in³
- rx X-axis radius of gyration
- 1.14 in
- rts Effective radius of gyration
- 0.657 in
- ho Flange centroid distance
- 2.65 in
Y- and z-axis properties
- Iy Y-axis moment of inertia
- 0.666 in⁴
- Zy Y-axis plastic section modulus
- 0.998 in³
- Sy Y-axis elastic section modulus
- 0.518 in³
- ry Y-axis radius of gyration
- 0.562 in
Torsion, warping & perimeters
- J Torsional constant
- 0.093 in⁴
- Cw Warping constant
- 0.915 in⁶
- PA Shape perimeter PA
- 10.2 in
- PB Shape perimeter PB
- 12.2 in
- PC Shape perimeter PC
- 7.94 in
- PD Shape perimeter PD
- 9.88 in
Compare published reference values
MC3X7.1 alongside nearby MC records
No other record shares this exact nominal series; these are the nearest weights in the same 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) |
|---|---|---|---|---|---|
| MC3X7.1 (this record) | 7.1 | 3 | 2.11 | 2.72 | 0.666 |
| MC6X7 | 7 | 6 | 2.09 | 11.4 | 0.603 |
| MC6X6.5 | 6.5 | 6 | 1.95 | 11 | 0.565 |
Relative to MC3X7.1, MC6X7 changes nominal weight by -0.1 lb/ft, listed depth by +3 in, and area by -0.02 in². At the same hypothetical 20 ft length, the nominal weight difference is -2 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