S shapes (American standard beams)

S18X70 S460X104

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 = 6.25d = 18tf = 0.691tf = 0.691tw = 0.711tw = 0.711
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Flange widthbf
6.25in
Web thicknesstw
0.711in
Flange thicknesstf
0.691in
Distance k (design)kdes
1.5in
Distance k (detailing)kdet
1.5in
Web clear depthT
15in
Distance between flange centroidsho
17.3in

Mass and area

Mass per lengthm
70lb/ft
Cross-sectional areaA
20.5in²

Strong axis x–x

Moment of inertiaIx
923in⁴
Elastic section modulusSx
103in³
Plastic section modulusZx
124in³
Radius of gyrationrx
6.7in

Weak axis y–y

Moment of inertiaIy
24in⁴
Elastic section modulusSy
7.69in³
Plastic section modulusZy
14.3in³
Radius of gyrationry
1.08in

Torsion and stability

Torsional constantJ
4.1in⁴
Warping constantCw
1,800in⁶
Effective radius of gyrationrts
1.42in

Slenderness ratios

Flange slendernessbf/2tf
4.52
Web slendernessh/tw
21.5

Equivalents in other standards