ISMC 125 Weight, Dimensions and IS 808 Properties
ISMC 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
- Web height 125 mm · flange width 65 mm · web thickness 5.0 mm
- Cross-sectional area 16.60 cm² · Ixx = 356.5 cm⁴
ISMC 125 is a widely used light-to-medium channel in IS 808:1989. At 13.1 kg/m with a 125 mm web and a notably wider 65 mm flange (compared to ISMC 100 and ISMC 150), it is used for portal frame purlins, stair stringers, light gantry rails, and machinery skids.
ISMC 125 Weight Calculator
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ISMC 125 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Web height | h | mm | 125 |
| Flange width | b | mm | 65 |
| Web thickness | tw | mm | 5.0 |
| Flange thickness | tf | mm | 8.1 |
| Cross-sectional area | A | cm² | 16.60 |
| Mass per metre | — | kg/m | 13.1 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 356.5 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 51.8 |
| Elastic section modulus (x–x) | Zxx | cm³ | 57.0 |
| Elastic section modulus (y–y) | Zyy | cm³ | 11.2 |
| Radius of gyration (x–x) | rxx | cm | 4.63 |
| Radius of gyration (y–y) | ryy | cm | 1.77 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.
Common Applications of ISMC 125
ISMC 125 is a popular choice for stair stringers in industrial buildings, light gantry crane rails up to 2-tonne capacity, portal frame purlins in spans up to 6 m, and base frames for small pumps and generators. The wider 65 mm flange compared to adjacent sizes makes bolted connections easier. SAIL Bhilai and JSW Vijayanagar produce ISMC 125 as standard stock in IS 2062 E250.
Worked Example
A fabricator in Rajkot needs 8 stair stringers of ISMC 125, each 3.6 m long, for an industrial mezzanine staircase. Total length = 8 × 3.6 = 28.8 m. Weight = 28.8 × 13.1 = 377.3 kg (0.377 tonnes). At a market rate of ₹58,000 per tonne (Rajkot, May 2026), the material cost is approximately ₹21,880 before cutting and welding.
Related ISMC Sections
Compare with adjacent sizes: ISMC 100 (9.2 kg/m) · ISMC 150 (16.8 kg/m). For all ISMC sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISMC 125 per metre?
ISMC 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.
ISMC 125 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISMC 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 ISMC 125?
ISMC 125 per IS 808:1989 has a web height of 125 mm, flange width of 65 mm, web thickness of 5.0 mm, and flange thickness of 8.1 mm. The cross-sectional area is 16.60 cm².
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