Rectangular and square HSS

HSS18X8X3/8 HSS457.2X203.2X9.5

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 = 8d = 18tdes = 0.349tdes = 0.349
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Widthb
8in
Nominal thicknesstnom
0.375in
Design thicknesstdes
0.349in

Mass and area

Mass per lengthm
63.21lb/ft
Cross-sectional areaA
17.3in²

Strong axis x–x

Moment of inertiaIx
711in⁴
Elastic section modulusSx
79in³
Plastic section modulusZx
98.7in³
Radius of gyrationrx
6.4in

Weak axis y–y

Moment of inertiaIy
202in⁴
Elastic section modulusSy
50.5in³
Plastic section modulusZy
56.1in³
Radius of gyrationry
3.41in

Torsion and stability

Torsional constantJ
510in⁴
Torsional modulusC
94.1in³

Slenderness ratios

Wall slendernessb/t
19.9
Wall slendernessh/t
48.6

Equivalents in other standards