I-beam — 107.32 kg per metre, 136 cm² cross-sectional area. IS 808 Table 3 - Narrow Parallel Flange Beams.
Narrow Parallel Flange Beams (NPB). Reproduced as printed in IS 808 Table 3 - Narrow Parallel Flange Beams.
As printed in IS 808 Table 3 - Narrow Parallel Flange Beams. 506 mm deep, 202 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 | 506 | mm |
|---|---|---|
| Width of flange B | 202 | mm |
| Thickness of web t | 12 | mm |
| Thickness of flange T | 19 | mm |
| Flange slope | 90 | ° |
| Root radius R1 | 21 | mm |
| Toe radius R2 | 0 | mm |
| Mass per metre M | 107.32 | kg/m |
|---|---|---|
| Sectional area A | 136 | cm² |
| Second moment of area Izz | 57,700 | cm⁴ |
|---|---|---|
| Radius of gyration rzz | 205 | mm |
| Elastic section modulus Zzz | 2,280 | cm³ |
| Plastic section modulus Zpz | 2,610 | cm³ |
| Second moment of area Iyy | 2,620 | cm⁴ |
|---|---|---|
| Radius of gyration ryy | 43.7 | mm |
| Elastic section modulus Zyy | 259 | cm³ |
| Plastic section modulus Zpy | 408 | cm³ |
| Torsion constant (St Venant) It | 142 | cm⁴ |
|---|---|---|
| Warping constant Iw | 15,40,000 | cm⁶ |
Total weight is the mass per metre multiplied by the length and the number of pieces. Ten pieces of NPB 500 × 200 at six metres each is 107.32 × 6 × 10 = 6,439 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: 136 cm² of steel at 7 850 kg/m³ is 106.76 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 808 : 2021 gives NPB 500 × 200 a mass of 107.32 kg per metre. Its printed cross-sectional area of 136 cm² agrees: 136 cm² of steel at 7 850 kg/m³ works out at 106.76 kg per metre.
643.92 kg. Mass per metre times length: 107.32 × 6. Ten such pieces come to 6439 kg.
506 mm deep and 202 mm wide, with a 12 mm web and 19 mm flanges.
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