ISHB 350 Weight, Dimensions and IS 808 Properties
ISHB 350 weighs 79.4 kg per metre as per IS 808:1989.
- One 6-metre length weighs 476.4 kg · one 12-metre length weighs 952.8 kg
- Overall depth 350 mm · flange width 250 mm · web thickness 8.1 mm
- Cross-sectional area 10,108 mm² · Ixx = 19,158.5 cm⁴
ISHB 350 is a heavy structural column section in IS 808:1989. At 79.4 kg/m with a 350 mm depth and 250 mm flange width, it is used for primary columns in heavy industrial buildings and as column sections in tall single-storey portal frame structures where significant bending and axial load must be resisted simultaneously. The fixed 250 mm flange is consistent across ISHB 300 to 450, giving a stable base plate width as depth and weight increase.
ISHB 350 Weight Calculator
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ISHB 350 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Overall depth | D | mm | 350 |
| Flange width | B | mm | 250 |
| Web thickness | tw | mm | 8.1 |
| Flange thickness | tf | mm | 11.6 |
| Cross-sectional area | A | mm² | 10,108 |
| Mass per metre | — | kg/m | 79.4 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 19,158.5 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 2,567.8 |
| Elastic section modulus (x–x) | Zxx | cm³ | 1,094.8 |
| Elastic section modulus (y–y) | Zyy | cm³ | 205.4 |
| Radius of gyration (x–x) | rxx | cm | 13.77 |
| Radius of gyration (y–y) | ryy | cm | 5.04 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.
Common Applications of ISHB 350
ISHB 350 is used as primary columns in heavy industrial buildings and portal frames up to 12 m height, column sections in heavy-duty crane runway structures, and column members in tall single-storey structures with significant wind-induced bending moments. The r_xx/r_yy ratio of approximately 2.73 means this section is substantially stronger about the x–x axis — design must account for the weaker y–y axis, typically by providing adequate intermediate restraint. SAIL Bhilai produces ISHB 350 in IS 2062 E250 and E350 grade, typically on indent with 2–4 week lead times at structural steel stockists.
Worked Example
A structural engineer in Chennai specifies 12 columns of ISHB 350, each 8 m tall, for a heavy industrial portal frame shed. Total length = 12 × 8 = 96 m. Weight = 96 × 79.4 = 7,622.4 kg (7.622 tonnes). At a market rate of ₹64,000 per tonne (Chennai, May 2026), the material cost is approximately ₹4,87,835 before connections and erection.
Related ISHB Sections
Compare with adjacent sizes: ISHB 300 (67.1 kg/m) · ISHB 400 (92.5 kg/m). For all ISHB sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISHB 350 per metre?
ISHB 350 weighs 79.4 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 476.4 kg. For a 12-metre length, total weight is 952.8 kg.
ISHB 350 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISHB 350 ka weight 79.4 kg/m hota hai. 6 metre ki ek length ka total weight 476.4 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISHB 350?
ISHB 350 per IS 808:1989 has an overall depth of 350 mm, flange width of 250 mm, web thickness of 8.1 mm, and flange thickness of 11.6 mm. The cross-sectional area is 10,108 mm².
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