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.

CISC M-shape dimensions and section properties in metric units
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.

Nominal depth series

Browse by series

Use these series labels to filter the finder table above.

M75 M100 M130 M150 M200 M250 M310 M318

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

W-Shapes S-Shapes HP-Shapes Channels MC Channels Angles All CISC families

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Source: CISC Structural Section Tables SST12.1 v12.1 · Verified July 2026 · View methodology