Hollow Section Calculator

Rectangular & square pipe properties — GI · Aluminium · Stainless Steel

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Step 1

Density 7850 kg/m³ · Yield 210 MPa · Tensile 330 MPa

Section Drawing & Properties

Step 2
B = 20 mmH = 20 mmt = 1.6 mm
Geometry & weight
Outer perimeter
80.0mm
C/S area
117.8mm²
Unit weight
0.924kg/m
Total weight
5.55kg
Centroid & moment of inertia
Centroid (x̄, ȳ)
10.0, 10.0 mm
Ixx
0.67cm⁴
Iyy
0.67cm⁴
rxx / ryy
0.75 / 0.75 cm
Section modulus
Zxx
0.67cm³
Zyy
0.67cm³
Allow. bending stress
138.6MPa
Allow. tensile stress
126.0MPa
Basis of permissible stress: indicative allowable values shown as a fraction of yield strength (bending ≈ 0.66·Fy, axial tensile ≈ 0.60·Fy) following the working-stress approach referenced in IS 800:2007 for steel sections and general allowable-stress practice (ASTM A500 / Aluminum Association ADM) for aluminium extrusions. These are for preliminary sizing only — verify against the governing project specification and have final designs checked by a qualified structural engineer.
All calculated values are geometric / indicative structural properties for preliminary engineering use. Cross-check permissible stresses with the applicable BIS (IS 800, IS 1161, IS 4923) or ASTM (A500, A240, B221) code edition before final design.