Rectangular and square HSS

HSS18X8X5/8 HSS457.2X203.2X15.9

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.
xyb = 8d = 18tdes = 0.581tdes = 0.581
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Widthb
8in
Nominal thicknesstnom
0.625in
Design thicknesstdes
0.581in

Mass and area

Mass per lengthm
101.9lb/ft
Cross-sectional areaA
28in²

Strong axis x–x

Moment of inertiaIx
1,100in⁴
Elastic section modulusSx
122in³
Plastic section modulusZx
156in³
Radius of gyrationrx
6.27in

Weak axis y–y

Moment of inertiaIy
306in⁴
Elastic section modulusSy
76.6in³
Plastic section modulusZy
87.8in³
Radius of gyrationry
3.31in

Torsion and stability

Torsional constantJ
797in⁴
Torsional modulusC
149in³

Slenderness ratios

Wall slendernessb/t
10.8
Wall slendernessh/t
28

Equivalents in other standards