S shapes (American standard beams)

S20X66 S510X98.2

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 = 6.26d = 20tf = 0.795tf = 0.795tw = 0.505tw = 0.505
Cross-section, to scaledimensions in inches

Dimensions

Depthd
20in
Flange widthbf
6.26in
Web thicknesstw
0.505in
Flange thicknesstf
0.795in
Distance k (design)kdes
1.63in
Distance k (detailing)kdet
1.625in
Web clear depthT
16.75in
Distance between flange centroidsho
19.2in

Mass and area

Mass per lengthm
66lb/ft
Cross-sectional areaA
19.4in²

Strong axis x–x

Moment of inertiaIx
1,190in⁴
Elastic section modulusSx
119in³
Plastic section modulusZx
139in³
Radius of gyrationrx
7.83in

Weak axis y–y

Moment of inertiaIy
27.5in⁴
Elastic section modulusSy
8.78in³
Plastic section modulusZy
15.4in³
Radius of gyrationry
1.19in

Torsion and stability

Torsional constantJ
3.58in⁴
Warping constantCw
2,530in⁶
Effective radius of gyrationrts
1.49in

Slenderness ratios

Flange slendernessbf/2tf
3.93
Web slendernessh/tw
33.5

Equivalents in other standards