ISMB 250 Weight, Dimensions and IS 808 Properties
ISMB 250 weighs 37.3 kg per metre as per IS 808:1989.
- One 6-metre length weighs 223.8 kg · one 12-metre length weighs 447.6 kg
- Overall depth 250 mm · flange width 125 mm · web thickness 6.9 mm
- Cross-sectional area 4,760 mm² · Ixx = 5,131.6 cm⁴
ISMB 250 is a high-demand medium beam in IS 808:1989, widely specified for primary floor beams, industrial platform girders, and portal frame rafters. Its 125 mm flange provides good lateral stability and straightforward bolted end-plate connections.
ISMB 250 Weight Calculator
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ISMB 250 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Overall depth | D | mm | 250 |
| Flange width | B | mm | 125 |
| Web thickness | tw | mm | 6.9 |
| Flange thickness | tf | mm | 12.5 |
| Cross-sectional area | A | mm² | 4,760 |
| Mass per metre | — | kg/m | 37.3 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 5,131.6 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 334.5 |
| Elastic section modulus (x–x) | Zxx | cm³ | 410.5 |
| Elastic section modulus (y–y) | Zyy | cm³ | 53.5 |
| Radius of gyration (x–x) | rxx | cm | 10.38 |
| Radius of gyration (y–y) | ryy | cm | 2.65 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.
Common Applications of ISMB 250
ISMB 250 is among the most commonly specified beams in Indian industrial construction. It is used for mezzanine primary beams, portal frame rafters, crane runway girders up to 5-tonne capacity, and staircase main stringers. SAIL, Tata Steel, and JSW Steel carry ISMB 250 as high-volume stock in IS 2062 E250 and E300 grades.
Worked Example
A structural fabricator in Hyderabad requires 10 primary beams of ISMB 250 each 6.0 m long for an industrial mezzanine floor rated at 500 kg/m². Total length = 10 × 6.0 = 60 m. Weight = 60 × 37.3 = 2,238 kg (2.238 tonnes). At ₹58,000 per tonne (May 2026), estimated material cost is approximately ₹1,29,800.
Related ISMB Sections
Compare with adjacent sizes: ISMB 225 (31.2 kg/m) · ISMB 300 (44.2 kg/m). For all ISMB sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISMB 250 per metre?
ISMB 250 weighs 37.3 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 223.8 kg. For a 12-metre length, total weight is 447.6 kg.
ISMB 250 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISMB 250 ka weight 37.3 kg/m hota hai. 6 metre ki ek length ka total weight 223.8 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISMB 250?
ISMB 250 per IS 808:1989 has an overall depth of 250 mm, flange width of 125 mm, web thickness of 6.9 mm, and flange thickness of 12.5 mm. The cross-sectional area is 4,760 mm².
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