ISMC Channel Weight Chart Explained: Complete Size, Dimensions & Weight Guide (2026)
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Introduction
If you’re sourcing structural steel for a fabrication project, warehouse frame, or industrial platform, chances are you’ve searched for an ISMC weight chart at some point. ISMC (Indian Standard Medium Channel) sections are one of the most widely used structural steel profiles in India, and getting the weight calculation right matters directly for your material costing, transport planning, and structural design load calculations.
This guide breaks down what ISMC channels are, how the standard sizing works, how weight per meter is derived, and how to read a weight chart correctly so you never over-order or under-budget on your next project.
What Is an ISMC Channel?
ISMC stands for Indian Standard Medium Channel, a C-shaped (channel-section) structural steel profile manufactured according to IS 808:1989, the Indian Standard that specifies dimensions, sectional properties, and permissible tolerances for hot-rolled steel sections.
ISMC channels are used extensively in:
- Purlins and roof trusses
- Machine bases and equipment frames
- Rail and conveyor structures
- General fabrication and cross-bracing
- Door and window frame reinforcement
Each ISMC size is denoted by a number that roughly corresponds to the depth of the channel in millimeters — for example, ISMC 100, ISMC 150, ISMC 200, and so on.
How to Read an ISMC Size Chart
An ISMC size chart typically lists the following parameters for each section:
| Parameter | Description |
|---|---|
| Designation | Nominal size, e.g., ISMC 100, ISMC 150 |
| Depth (h) | Overall height of the channel section (mm) |
| Flange Width (b) | Width of the top and bottom flanges (mm) |
| Web Thickness (tw) | Thickness of the vertical web (mm) |
| Flange Thickness (tf) | Thickness of the flanges (mm) |
| Sectional Area | Cross-sectional area (cm²) |
| Weight per Meter | Mass of the channel per running meter (kg/m) |
| Moment of Inertia (Ixx, Iyy) | Used for deflection and bending calculations |
The weight per meter column is what most buyers and site engineers look up first, since it directly determines the tonnage — and therefore the cost — of a given length of channel.
Sample ISMC Weight Chart (Common Sizes)
Below is a general reference table showing how ISMC designation correlates with approximate weight per meter. Always confirm exact figures against the current IS 808 standard or your supplier’s mill test certificate, since minor rolling tolerances can cause slight variation between manufacturers.
| Designation | Depth (mm) | Flange Width (mm) | Approx. Weight (kg/m) |
|---|---|---|---|
| ISMC 75 | 75 | 40 | ~6.8 |
| ISMC 100 | 100 | 50 | ~9.2 |
| ISMC 125 | 125 | 65 | ~13.1 |
| ISMC 150 | 150 | 75 | ~16.4 |
| ISMC 200 | 200 | 75 | ~22.3 |
| ISMC 250 | 250 | 80 | ~30.4 |
| ISMC 300 | 300 | 90 | ~36.3 |
| ISMC 400 | 400 | 100 | ~49.4 |
Note: These are indicative reference values. For procurement and structural design, always verify against the latest IS 808 tables or your mill’s certified data sheet.
How Is Channel Weight Calculated?
The theoretical weight per meter of a channel section is derived using its cross-sectional area and the density of steel (typically taken as 7.85 g/cm³):
Weight (kg/m) = Cross-sectional Area (cm²) × 7.85
This is why the sectional area listed in the IS 808 chart is just as important as the depth and flange width — it’s the actual basis for the weight figure, not just the outer dimensions.
Why Weight Accuracy Matters
- Costing accuracy — Steel is typically priced per kg or per tonne, so an incorrect weight assumption directly skews your material budget.
- Transport and logistics — Overloading trucks or underestimating crane capacity because of weight miscalculation can cause project delays or safety issues.
- Structural design compliance — Engineers use the exact sectional weight and moment of inertia values for load-bearing calculations; approximate numbers aren’t acceptable at the design stage.
- Billing verification — Cross-checking delivered tonnage against theoretical weight per meter helps confirm you’re receiving the correct quantity.
Common Mistakes When Using a Weight Chart
- Confusing ISMC with ISMB or ISA — channels, beams, and angles all have different weight charts; using the wrong one leads to major errors.
- Ignoring tolerance ranges — actual rolled weight can vary marginally (usually within ±2.5%) from theoretical values.
- Using outdated or unverified charts — always cross-reference with IS 808 or a reliable supplier data sheet.
- Forgetting length in calculations — weight per meter must be multiplied by total length to get actual project tonnage.
Conclusion
An ISMC weight chart is one of the most practical tools you’ll use when planning structural steel procurement. Whether you’re a contractor estimating tonnage, a fabricator planning cutting lists, or an engineer verifying design loads, understanding how ISMC sizes and weights are structured helps you avoid costly errors.
For verified specifications, current stock availability, and mill test certificates on ISMC channels, explore our [Steel Channel Product Page] for complete size-wise details and instant quotes.
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A: Carbon steel relies on carbon content alone for its properties. Alloy steel adds elements like chromium, nickel, molybdenum, and vanadium to achieve specific improvements — higher strength, better low-temperature toughness, creep resistance, or corrosion resistance — giving it a far broader performance range than carbon steel.
A: For ambient to 400°C service, ASTM A516 Grade 70 is the standard choice. For high-temperature refinery or power plant use (up to 600°C), ASTM A387 Grade 11 or 22 (chrome-moly) applies. For cryogenic service down to -196°C, 9% nickel steel (ASTM A553) is required.
A: Wear-resistant grades like AR400/AR500 are quenched to martensitic hardness of 370–500 HB — 3–4× harder than structural grades like A572-50. They resist abrasive wear in mining and construction equipment but have limited weldability and are not suitable as primary structural members.
A: CE (= C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) predicts susceptibility to hydrogen-induced cold cracking during welding. Sheets with CE above ~0.40 require preheating to slow cooling and allow hydrogen diffusion, preventing weld cracking. Always develop a qualified WPS based on the specific CE value.
