Rectangular and square HSS

HSS18X8X1/2 HSS457.2X203.2X12.7

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 = 0.465tdes = 0.465
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Widthb
8in
Nominal thicknesstnom
0.5in
Design thicknesstdes
0.465in

Mass and area

Mass per lengthm
82.88lb/ft
Cross-sectional areaA
22.8in²

Strong axis x–x

Moment of inertiaIx
913in⁴
Elastic section modulusSx
101in³
Plastic section modulusZx
128in³
Radius of gyrationrx
6.33in

Weak axis y–y

Moment of inertiaIy
257in⁴
Elastic section modulusSy
64.2in³
Plastic section modulusZy
72.5in³
Radius of gyrationry
3.36in

Torsion and stability

Torsional constantJ
659in⁴
Torsional modulusC
122in³

Slenderness ratios

Wall slendernessb/t
14.2
Wall slendernessh/t
35.7

Equivalents in other standards