CISC M-Shapes & Section Properties
Browse CISC Miscellaneous beams from Structural Section Tables SST12.1. Compare metric-native dimensions and section properties, open a designation for full details, or load a section into Optimal Beam.
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Showing CISC · M-Shapes · Metric
CISC Structural Section Tables SST12.1 · 1,514 sections
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Showing the most relevant 75 sections.
| Designation | Weight (kg/m) | Depth, d (mm) | Flange width, bf (mm) | Area (mm²) | Ix (mm⁴) | Sx (mm³) |
|---|---|---|---|---|---|---|
| M318×18.5 | 18.5 | 318 | 95 | 2330 | 37000000 | 233000 |
| M318×17.3 | 17.3 | 317 | 89 | 2190 | 33400000 | 211000 |
| M310×17.6 | 17.6 | 305 | 78 | 2240 | 30100000 | 197000 |
| M310×14.9 | 14.9 | 304 | 83 | 1910 | 25800000 | 170000 |
| M310×16.1 | 16.1 | 304 | 78 | 2060 | 27700000 | 182000 |
| M250×13.4 | 13.4 | 254 | 68 | 1710 | 16200000 | 127000 |
| M250×11.2 | 11.2 | 253 | 68 | 1430 | 13600000 | 108000 |
| M250×11.9 | 11.9 | 253 | 68 | 1530 | 14400000 | 113000 |
| M200×9.2 | 9.2 | 203 | 58 | 1180 | 7300000 | 71900 |
| M200×9.7 | 9.7 | 203 | 57 | 1220 | 7610000 | 74900 |
| M150×6.6 | 6.6 | 152 | 47 | 834 | 2990000 | 39300 |
| M150×5.5 | 5.5 | 150 | 51 | 706 | 2480000 | 33000 |
| M130×28.1 | 28.1 | 127 | 127 | 3590 | 10100000 | 158000 |
| M100×6.1 | 6.1 | 102 | 57 | 816 | 1480000 | 29000 |
| M100×8.9 | 8.9 | 97 | 97 | 1140 | 2000000 | 41200 |
| M75×4.3 | 4.3 | 76 | 57 | 588 | 618000 | 16300 |
Family overview
What are CISC M-Shapes?
Browse CISC Miscellaneous beams from Structural Section Tables SST12.1. Compare metric-native dimensions and section properties, open a designation for full details, or load a section into Optimal Beam.
Designations
Understanding M-Shapes designations
CISC M designations use nominal metric depth and mass.
Properties
M-Shapes properties explained
These properties are especially relevant when comparing M-Shapes. View the complete property glossary.
| Symbol | Property | Units | Why it matters |
|---|---|---|---|
| Weight | Weight | lb/ft, kg/m | Mass per unit length; used for self-weight and economy comparisons |
| d | Overall depth | in, mm | Overall depth and clearance |
| bf | Flange width | in, mm | Overall flange width and lateral behaviour |
| tw | Web thickness | in, mm | Web thickness and shear-related behaviour |
| tf | Flange thickness | in, mm | Flange thickness and flexural/local behaviour |
| A | Cross-sectional area | in², mm² | Total steel cross-sectional area |
| Ix | Moment of inertia (x) | in⁴, mm⁴ | Major-axis flexural stiffness |
| Iy | Moment of inertia (y) | in⁴, mm⁴ | Minor-axis flexural stiffness |
| Sx | Elastic section modulus (x) | in³, mm³ | Elastic bending property about the x-axis |
| Sy | Elastic section modulus (y) | in³, mm³ | Elastic bending property about the y-axis |
| Zx | Plastic section modulus (x) | in³, mm³ | Plastic bending property about the x-axis |
| Zy | Plastic section modulus (y) | in³, mm³ | Plastic bending property about the y-axis |
| rx | Radius of gyration (x) | in, mm | Strong-axis radius of gyration |
| ry | Radius of gyration (y) | in, mm | Weak-axis radius of gyration and lateral stability relevance |
| J | Torsional constant | in⁴, mm⁴ | Torsional constant |
| Cw | Warping constant | in⁶, mm⁶ | Warping constant for lateral-torsional behaviour |
Library summary
Computed M-Shapes summary
The current CISC M-Shapes library contains 16 sections across 8 nominal-depth series. Published weights range from 2.90 to 18.90 lb/ft , and actual depths range from 2.99 to 12.52 inches .
- Lightest section
- M75x4.3
- Heaviest section
- M130x28.1
- Ix range
- 1.48 – 88.89 in⁴
- Sx range
- 0.99 – 14.22 in³
Related families
Related CISC families
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Source: CISC Structural Section Tables SST12.1 v12.1 · Verified July 2026 · View methodology