Rectangular and square HSS

HSS18X18X7/8 HSS457.2X457.2X22.2

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 = 0.814tdes = 0.814
Cross-section, to scaledimensions in inches

Dimensions

Depthd
18in
Widthb
18in
Nominal thicknesstnom
0.875in
Design thicknesstdes
0.814in

Mass and area

Mass per lengthm
197.2lb/ft
Cross-sectional areaA
54.3in²

Strong axis x–x

Moment of inertiaIx
2,630in⁴
Elastic section modulusSx
292in³
Plastic section modulusZx
346in³
Radius of gyrationrx
6.96in

Weak axis y–y

Moment of inertiaIy
2,630in⁴
Elastic section modulusSy
292in³
Plastic section modulusZy
346in³
Radius of gyrationry
6.96in

Torsion and stability

Torsional constantJ
4,220in⁴
Torsional modulusC
479in³

Slenderness ratios

Wall slendernessb/t
19.2
Wall slendernessh/t
19.2

Equivalents in other standards