S shapes (American standard beams)

S12X50 S310X74

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 = 5.48d = 12tf = 0.659tf = 0.659tw = 0.687tw = 0.687
Cross-section, to scaledimensions in inches

Dimensions

Depthd
12in
Flange widthbf
5.48in
Web thicknesstw
0.687in
Flange thicknesstf
0.659in
Distance k (design)kdes
1.44in
Distance k (detailing)kdet
1.438in
Web clear depthT
9.125in
Distance between flange centroidsho
11.3in

Mass and area

Mass per lengthm
50lb/ft
Cross-sectional areaA
14.7in²

Strong axis x–x

Moment of inertiaIx
303in⁴
Elastic section modulusSx
50.6in³
Plastic section modulusZx
60.9in³
Radius of gyrationrx
4.55in

Weak axis y–y

Moment of inertiaIy
15.6in⁴
Elastic section modulusSy
5.69in³
Plastic section modulusZy
10.3in³
Radius of gyrationry
1.03in

Torsion and stability

Torsional constantJ
2.77in⁴
Warping constantCw
501in⁶
Effective radius of gyrationrts
1.32in

Slenderness ratios

Flange slendernessbf/2tf
4.16
Web slendernessh/tw
13.7

Equivalents in other standards