Rectangular and square HSS

HSS18X8X5/16 HSS457.2X203.2X7.9

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 = 0.291tdes = 0.291
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Widthb
8in
Nominal thicknesstnom
0.3125in
Design thicknesstdes
0.291in

Mass and area

Mass per lengthm
53.11lb/ft
Cross-sectional areaA
14.6in²

Strong axis x–x

Moment of inertiaIx
604in⁴
Elastic section modulusSx
67.1in³
Plastic section modulusZx
83.4in³
Radius of gyrationrx
6.44in

Weak axis y–y

Moment of inertiaIy
172in⁴
Elastic section modulusSy
43in³
Plastic section modulusZy
47.5in³
Radius of gyrationry
3.44in

Torsion and stability

Torsional constantJ
432in⁴
Torsional modulusC
79.4in³

Slenderness ratios

Wall slendernessb/t
24.5
Wall slendernessh/t
58.9

Equivalents in other standards