Rectangular and square HSS

HSS20X12X5/16 HSS508X304.8X7.9

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 = 12d = 20tdes = 0.291tdes = 0.291
Cross-section, to scaledimensions in inches

Dimensions

Depthd
20in
Widthb
12in
Nominal thicknesstnom
0.3125in
Design thicknesstdes
0.291in

Mass and area

Mass per lengthm
65.87lb/ft
Cross-sectional areaA
18.1in²

Strong axis x–x

Moment of inertiaIx
1,010in⁴
Elastic section modulusSx
101in³
Plastic section modulusZx
122in³
Radius of gyrationrx
7.48in

Weak axis y–y

Moment of inertiaIy
464in⁴
Elastic section modulusSy
77.3in³
Plastic section modulusZy
85.8in³
Radius of gyrationry
5.07in

Torsion and stability

Torsional constantJ
997in⁴
Torsional modulusC
134in³

Slenderness ratios

Wall slendernessb/t
38.2
Wall slendernessh/t
65.7

Equivalents in other standards