Rectangular and square HSS

HSS18X18X3/8 HSS457.2X457.2X9.5

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 = 0.349tdes = 0.349
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Widthb
18in
Nominal thicknesstnom
0.375in
Design thicknesstdes
0.349in

Mass and area

Mass per lengthm
88.73lb/ft
Cross-sectional areaA
24.3in²

Strong axis x–x

Moment of inertiaIx
1,250in⁴
Elastic section modulusSx
139in³
Plastic section modulusZx
160in³
Radius of gyrationrx
7.18in

Weak axis y–y

Moment of inertiaIy
1,250in⁴
Elastic section modulusSy
139in³
Plastic section modulusZy
160in³
Radius of gyrationry
7.18in

Torsion and stability

Torsional constantJ
1,940in⁴
Torsional modulusC
217in³

Slenderness ratios

Wall slendernessb/t
48.6
Wall slendernessh/t
48.6

Equivalents in other standards