M shapes

M12.5X12.4 M318X18.5

Standard: AISC Shapes Database v16.0Source: AISC (aisc.org) — Shapes Database v16.0 (Excel file)
Values published by AISC, in US customary (original) and SI units.
xybf = 3.75d = 12.5tf = 0.228tf = 0.228tw = 0.155tw = 0.155
Cross-section, to scaledimensions in inches

Dimensions

Depthd
12.5in
Flange widthbf
3.75in
Web thicknesstw
0.155in
Flange thicknesstf
0.228in
Distance k (design)kdes
0.563in
Distance k (detailing)kdet
0.5625in
Distance k1k1
0.375in
Web clear depthT
11.38in
Distance between flange centroidsho
12.3in

Mass and area

Mass per lengthm
12.4lb/ft
Cross-sectional areaA
3.63in²

Strong axis x–x

Moment of inertiaIx
89.3in⁴
Elastic section modulusSx
14.2in³
Plastic section modulusZx
16.5in³
Radius of gyrationrx
4.96in

Weak axis y–y

Moment of inertiaIy
2.01in⁴
Elastic section modulusSy
1.07in³
Plastic section modulusZy
1.68in³
Radius of gyrationry
0.744in

Torsion and stability

Torsional constantJ
0.0493in⁴
Warping constantCw
76in⁶
Effective radius of gyrationrts
0.933in

Slenderness ratios

Flange slendernessbf/2tf
8.22
Web slendernessh/tw
74.8

Equivalents in other standards