ISMB 350 Weight, Dimensions and IS 808 Properties
ISMB 350 weighs 52.4 kg per metre as per IS 808:1989.
- One 6-metre length weighs 314.4 kg · one 12-metre length weighs 628.8 kg
- Overall depth 350 mm · flange width 140 mm · web thickness 8.1 mm
- Cross-sectional area 6,660 mm² · Ixx = 13,630.3 cm⁴
ISMB 350 is a heavy medium beam per IS 808:1989, used in multi-storey steel frames, heavy crane runway girders, and long-span industrial roofs. Its 350 mm depth delivers substantially higher bending stiffness than ISMB 300 at the same 140 mm flange width.
ISMB 350 Weight Calculator
Enter the total length in metres to calculate weight.
ISMB 350 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Overall depth | D | mm | 350 |
| Flange width | B | mm | 140 |
| Web thickness | tw | mm | 8.1 |
| Flange thickness | tf | mm | 14.2 |
| Cross-sectional area | A | mm² | 6,660 |
| Mass per metre | — | kg/m | 52.4 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 13,630.3 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 537.5 |
| Elastic section modulus (x–x) | Zxx | cm³ | 779.0 |
| Elastic section modulus (y–y) | Zyy | cm³ | 76.8 |
| Radius of gyration (x–x) | rxx | cm | 14.30 |
| 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 350
ISMB 350 is specified for heavy mezzanine primary beams, crane runway girders up to 15-tonne capacity, and multi-storey steel frame floor beams. SAIL and Tata Steel supply ISMB 350 in IS 2062 E300 and E350 grades for structural applications requiring higher yield strength.
Worked Example
A structural contractor in Bengaluru requires 6 crane girders of ISMB 350 each 8.0 m long for a 10-tonne EOT crane bay. Total length = 6 × 8.0 = 48 m. Weight = 48 × 52.4 = 2,515.2 kg (2.515 tonnes). At ₹58,000 per tonne (May 2026), estimated material cost is approximately ₹1,45,900.
Related ISMB Sections
Compare with adjacent sizes: ISMB 300 (44.2 kg/m) · ISMB 400 (61.6 kg/m). For all ISMB sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISMB 350 per metre?
ISMB 350 weighs 52.4 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 314.4 kg. For a 12-metre length, total weight is 628.8 kg.
ISMB 350 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISMB 350 ka weight 52.4 kg/m hota hai. 6 metre ki ek length ka total weight 314.4 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISMB 350?
ISMB 350 per IS 808:1989 has an overall depth of 350 mm, flange width of 140 mm, web thickness of 8.1 mm, and flange thickness of 14.2 mm. The cross-sectional area is 6,660 mm².
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