ISMB 300 Weight, Dimensions and IS 808 Properties
ISMB 300 weighs 44.2 kg per metre as per IS 808:1989.
- One 6-metre length weighs 265.2 kg · one 12-metre length weighs 530.4 kg
- Overall depth 300 mm · flange width 140 mm · web thickness 7.7 mm
- Cross-sectional area 5,630 mm² · Ixx = 8,603.6 cm⁴
ISMB 300 is a heavy-duty medium beam per IS 808:1989, frequently used in multi-storey industrial buildings, heavy mezzanines, crane runway girders, and portal frame structures requiring spans up to 8 m. Its 140 mm flange allows robust bolted moment connections.
ISMB 300 Weight Calculator
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ISMB 300 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Overall depth | D | mm | 300 |
| Flange width | B | mm | 140 |
| Web thickness | tw | mm | 7.7 |
| Flange thickness | tf | mm | 13.1 |
| Cross-sectional area | A | mm² | 5,630 |
| Mass per metre | — | kg/m | 44.2 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 8,603.6 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 453.9 |
| Elastic section modulus (x–x) | Zxx | cm³ | 573.6 |
| Elastic section modulus (y–y) | Zyy | cm³ | 64.8 |
| Radius of gyration (x–x) | rxx | cm | 12.36 |
| Radius of gyration (y–y) | ryy | cm | 2.84 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.
Common Applications of ISMB 300
ISMB 300 is a standard choice for primary beams in heavy industrial mezzanines, crane girders up to 10-tonne capacity, and portal frame rafters in medium-span sheds. Its 140 mm flange is the widest in the light-to-medium range, making it well-suited for four-bolt end-plate connections. SAIL and Tata Steel supply ISMB 300 in IS 2062 E250 and E300 grades.
Worked Example
A structural contractor in Chennai needs 8 crane runway girders of ISMB 300 each 7.5 m long for a 5-tonne EOT crane. Total length = 8 × 7.5 = 60 m. Weight = 60 × 44.2 = 2,652 kg (2.652 tonnes). At ₹58,000 per tonne (May 2026), estimated material cost is approximately ₹1,53,820.
Related ISMB Sections
Compare with adjacent sizes: ISMB 250 (37.3 kg/m) · ISMB 350 (52.4 kg/m). For all ISMB sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISMB 300 per metre?
ISMB 300 weighs 44.2 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 265.2 kg. For a 12-metre length, total weight is 530.4 kg.
ISMB 300 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISMB 300 ka weight 44.2 kg/m hota hai. 6 metre ki ek length ka total weight 265.2 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISMB 300?
ISMB 300 per IS 808:1989 has an overall depth of 300 mm, flange width of 140 mm, web thickness of 7.7 mm, and flange thickness of 13.1 mm. The cross-sectional area is 5,630 mm².
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