rectangular hollow section — 2.36 kg per metre, 3.01 cm² cross-sectional area. IS 4923:2017 Table 2 - Rectangular Hollow Sections (Amd. 2, weights per Amd. 3).
Rectangular Hollow Sections. Reproduced as printed in IS 4923:2017 Table 2 - Rectangular Hollow Sections (Amd. 2, weights per Amd. 3).
As printed in IS 4923:2017 Table 2 - Rectangular Hollow Sections (Amd. 2, weights per Amd. 3). 40 mm deep, 20 mm wide. Units are shown on every row, because the two standards on this site use different ones for the radius of gyration.
| Depth of section D | 40 | mm |
|---|---|---|
| Width of section B | 20 | mm |
| Wall thickness t | 3 | mm |
| Mass per metre M | 2.36 | kg/m |
|---|---|---|
| Sectional area A | 3.01 | cm² |
| Second moment of area Ixx | 5.21 | cm⁴ |
|---|---|---|
| Radius of gyration rxx | 1.32 | cm |
| Elastic section modulus Ze,xx | 2.6 | cm³ |
| Plastic section modulus Zp,xx | 3.5 | cm³ |
| Second moment of area Iyy | 1.68 | cm⁴ |
|---|---|---|
| Radius of gyration ryy | 0.75 | cm |
| Elastic section modulus Ze,yy | 1.68 | cm³ |
| Plastic section modulus Zp,yy | 2.12 | cm³ |
Total weight is the mass per metre multiplied by the length and the number of pieces. Ten pieces of 40x20x3.0 at six metres each is 2.36 × 6 × 10 = 142 kg. There is nothing else to it — the standard publishes the mass, so no one needs to compute it from the area.
You can check that mass against the area on this page: 3.01 cm² of steel at 7 850 kg/m³ is 2.36 kg/m. Every row in this dataset was checked that way, which is how the contradictions flagged on some of these pages were found.
Work it out for your own lengths and quantities →
IS 4923 : 2017 gives 40x20x3.0 a mass of 2.36 kg per metre. Its printed cross-sectional area of 3.01 cm² agrees: 3.01 cm² of steel at 7 850 kg/m³ works out at 2.36 kg per metre.
14.16 kg. Mass per metre times length: 2.36 × 6. Ten such pieces come to 142 kg.
40 mm deep and 20 mm wide, with a 3 mm web.
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Log in to QuickBOQ →Where these figures come from. IS 4923:2017 Table 2 - Rectangular Hollow Sections (Amd. 2, weights per Amd. 3) Section properties are facts published in the standards, and they are reproduced here as printed. Where a standard contradicts itself, both of its figures are shown and neither is corrected.
What is ours. The selection and arrangement of these tables, the checks run against them, and the findings those checks produced — which rows disagree with themselves, which figures were superseded by amendment, and which could not be read — are QuickBOQ’s work, and so is this wording. Quote the numbers freely; they belong to everyone. Copying the compilation and the commentary is a different thing, and we would rather you linked to it.