Rectangular and square HSS

HSS18X18X5/8 HSS457.2X457.2X15.9

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

Dimensions

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

Mass and area

Mass per lengthm
144.4lb/ft
Cross-sectional areaA
39.6in²

Strong axis x–x

Moment of inertiaIx
1,980in⁴
Elastic section modulusSx
220in³
Plastic section modulusZx
257in³
Radius of gyrationrx
7.07in

Weak axis y–y

Moment of inertiaIy
1,980in⁴
Elastic section modulusSy
220in³
Plastic section modulusZy
257in³
Radius of gyrationry
7.07in

Torsion and stability

Torsional constantJ
3,120in⁴
Torsional modulusC
352in³

Slenderness ratios

Wall slendernessb/t
28.1
Wall slendernessh/t
28.1

Equivalents in other standards