ISMB 125 Weight, Dimensions and IS 808 Properties
ISMB 125 weighs 13.1 kg per metre as per IS 808:1989.
- One 6-metre length weighs 78.6 kg · one 12-metre length weighs 157.2 kg
- Overall depth 125 mm · flange width 75 mm · web thickness 4.4 mm
- Cross-sectional area 1,670 mm² · Ixx = 497.2 cm⁴
ISMB 125 is a light medium-weight beam per IS 808:1989, commonly used for secondary beams, lintels, and light floor framing where a step up in stiffness from ISMB 100 is required without a significant weight penalty.
ISMB 125 Weight Calculator
Enter the total length in metres to calculate weight.
ISMB 125 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Overall depth | D | mm | 125 |
| Flange width | B | mm | 75 |
| Web thickness | tw | mm | 4.4 |
| Flange thickness | tf | mm | 7.6 |
| Cross-sectional area | A | mm² | 1,670 |
| Mass per metre | — | kg/m | 13.1 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 497.2 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 43.9 |
| Elastic section modulus (x–x) | Zxx | cm³ | 79.5 |
| Elastic section modulus (y–y) | Zyy | cm³ | 11.7 |
| Radius of gyration (x–x) | rxx | cm | 5.46 |
| Radius of gyration (y–y) | ryy | cm | 1.62 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.
Common Applications of ISMB 125
ISMB 125 is used for lintels, light mezzanine beams, stair stringers, and purlins in industrial sheds. Its 125 mm depth gives a useful increase in bending stiffness over ISMB 100 with only a modest weight increase. SAIL and Tata Steel supply ISMB 125 in IS 2062 E250 grade as standard mill stock.
Worked Example
A contractor in Pune requires 24 pieces of ISMB 125 each 2.4 m long for mezzanine secondary beams. Total length = 24 × 2.4 = 57.6 m. Weight = 57.6 × 13.1 = 754.6 kg (0.755 tonnes). At ₹58,000 per tonne (May 2026), estimated material cost is approximately ₹43,760.
Related ISMB Sections
Compare with adjacent sizes: ISMB 100 (10.6 kg/m) · ISMB 150 (14.9 kg/m). For all ISMB sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISMB 125 per metre?
ISMB 125 weighs 13.1 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 78.6 kg. For a 12-metre length, total weight is 157.2 kg.
ISMB 125 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISMB 125 ka weight 13.1 kg/m hota hai. 6 metre ki ek length ka total weight 78.6 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISMB 125?
ISMB 125 per IS 808:1989 has an overall depth of 125 mm, flange width of 75 mm, web thickness of 4.4 mm, and flange thickness of 7.6 mm. The cross-sectional area is 1,670 mm².
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