ISMB & ISMC section chart with weight per metre.
Look up Indian Standard Medium Beam (ISMB) and Medium Channel (ISMC) sizes with depth, flange width, web and flange thickness and published weight in kg/m, then calculate the stock weight for your length and number of pieces. Each producer's figures are shown separately with their source; sizes without a checked source are not estimated.
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Full gauge table
SWG (British Standard Wire Gauge, BS 3737) is used for sheet and wire; BWG (Birmingham Wire Gauge) for tube walls. Weights are for 1 m² of steel sheet at 7.85 g/cm³.
Paste the chemistry from a mill test certificate. The checker tests it against every grade and shows which ones it meets, nearly meets or misses, element by element.
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CEV (IIW) = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15. Pcm = C + Si/30 + (Mn+Cu+Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B.
Limits are heat (ladle) analysis in wt%, from the first standard listed for each grade; where limits change with thickness, the thinnest bracket is used. This is a screening aid, not a certificate of conformity. Final acceptance depends on the standard edition, product analysis tolerances, mechanical tests and the purchase order.
Theoretical weight from nominal size and density. Actual weight varies within mill tolerances.
Pressure figures are inherited equation estimates, not certified ratings, hydrotest instructions or engineering approval. Confirm allowable stress, temperature, fabrication factors, corrosion and the governing code with a qualified engineer.
Pressure estimate screening only · straight-pipe equation assumptions
S is filled with the B31.3 allowable at ≤38 °C (100 °F): the lesser of UTS/3 and ⅔ of yield. For higher temperatures, type the code allowable at your design temperature. Both results below use the minimum wall (nominal minus mill tolerance minus corrosion allowance).
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5S, 10S, 40S and 80S per ASME B36.19M (stainless). Sch 10, 20, 40, 80, 160, STD, XS and XXS per ASME B36.10M (carbon and alloy). Up to 10", 40S = STD = Sch 40 and 80S = XS = Sch 80. Weights are theoretical.
Pressure ratings are an engineering estimate, not a design approval. B31.3 MAWP = 2·S·E·W·t ÷ (D − 2·Y·t), with W = 1.0 and Y = 0.4 (valid for t < D/6 and below the creep range). Barlow = 2·Sy·t ÷ D ÷ safety factor, a quick yield-based check. Flanges, fittings, valves and branch connections often rate lower than the pipe. Have the piping design checked by the responsible engineer.
Full table
Full table, all sizes
Center-to-end and length dimensions per ASME B16.9. Wall thickness and bevel match the pipe schedule ordered. Weights are published approximate weights for carbon steel, STD and XS walls. Stainless butt-weld fittings to MSS SP-43 (5S/10S) are lighter.
| Class | Ends | Matching pipe | Sizes |
|---|---|---|---|
| 2000 | Threaded only | Sch 40 / STD | ⅛" to 4" |
| 3000 | Socket weld and threaded | Sch 80 / XS | ⅛" to 4" |
| 6000 | Socket weld and threaded | Sch 160 | ⅛" to 2" (threaded to 4") |
| 9000 | Socket weld only | XXS | ½" to 2" |
Match the fitting class to the pipe schedule: a Class 3000 fitting on Sch 160 pipe is the weak point of the line. Threads are NPT (ASME B1.20.1) unless BSP is ordered. Unions are to MSS SP-83, swage nipples to MSS SP-95, branch outlets (weldolet, sockolet, threadolet) to MSS SP-97. Detailed B16.11 dimensions are being added after independent checking.
Length
Weight
Pressure / stress
Temperature
Hardness and tensile strength (approximate, carbon and alloy steel)
Type any one value. Hardness scales per ASTM E140 Table 1; approximate tensile strength per ASTM A370 Table 3 / SAE J417, for carbon and alloy steels in the annealed, normalised or quenched-and-tempered condition. Not valid for austenitic stainless, cold-worked material or non-ferrous metals. Expect ±10% on tensile.
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Aluminium tempers (what the letters mean)
- F
- As fabricated, no property guarantee
- O
- Fully annealed, softest and most formable
- H1x
- Strain hardened only (H12 quarter hard, H14 half hard, H16 three-quarter hard, H18 full hard)
- H2x
- Strain hardened, then partially annealed (H22, H24, H26)
- H3x
- Strain hardened and stabilised, used for 5xxx alloys (H32, H34, H38)
- H111 / H116 / H321
- 5xxx marine tempers; H116 and H321 are tested for exfoliation corrosion
- T3
- Solution treated, cold worked, naturally aged (2024-T3)
- T4
- Solution treated and naturally aged
- T5
- Cooled from extrusion and artificially aged (6063-T5)
- T6
- Solution treated and artificially aged: peak strength (6061-T6, 7075-T6)
- Tx51 / Tx511
- Stress relieved by stretching (T651 plate, T6511 extrusions): stable when machined
- T73 / T7351 / T76
- Over-aged for stress-corrosion resistance (7075-T7351)
- T8
- Solution treated, cold worked, artificially aged
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ISMB beams (Indian Standard Medium Beams): dimensions and weight per metre
SAIL · IS 808:2021 brochure
Structurals from SAIL, September 2023, printed page 10 (PDF page 12). Dimensions and mass transcribed and visually checked 28 October 2026. Manufacturer reference; not independent certification. Source
| Section | Depth D, mm | Flange width B, mm | Web t, mm | Flange T, mm | Weight, kg/m | 6 m length, kg |
|---|---|---|---|---|---|---|
| ISMB 100 | 100 | 50 | 4.7 | 7 | 8.95 | 53.70 |
| ISMB 150 | 150 | 75 | 5 | 8 | 14.96 | 89.76 |
| ISMB 250 | 250 | 125 | 6.9 | 12.5 | 37.3 | 223.80 |
| ISMB 300 | 300 | 140 | 7.7 | 13.1 | 46.02 | 276.12 |
Varrsana · producer range
Producer-published Product Range & Sizes, checked 28 October 2026. Web table does not state the dimensional-standard edition; flange and web thickness are not supplied. Source
| Section | Depth D, mm | Flange width B, mm | Web t, mm | Flange T, mm | Weight, kg/m | 6 m length, kg |
|---|---|---|---|---|---|---|
| ISMB 150 | 150 | 75 | Not published | Not published | 15 | 90.00 |
| ISMB 200 | 200 | 100 | Not published | Not published | 25.4 | 152.40 |
| ISMB 250 | 250 | 125 | Not published | Not published | 37.3 | 223.80 |
| ISMB 300 | 300 | 140 | Not published | Not published | 44.2 | 265.20 |
| ISMB 400 | 400 | 140 | Not published | Not published | 61.6 | 369.60 |
| ISMB 600 | 600 | 210 | Not published | Not published | 122.6 | 735.60 |
Not listed yet (no checked source bundled): ISMB 125, ISMB 175, ISMB 225, ISMB 350, ISMB 450, ISMB 500, ISMB 550. Ask us for current mill figures.
ISMC channels (Indian Standard Medium Channels): dimensions and weight per metre
SAIL · IS 808:2021 brochure
Structurals from SAIL, September 2023, printed page 10 (PDF page 12). Dimensions and mass transcribed and visually checked 28 October 2026. Manufacturer reference; not independent certification. Source
| Section | Depth D, mm | Flange width B, mm | Web t, mm | Flange T, mm | Weight, kg/m | 6 m length, kg |
|---|---|---|---|---|---|---|
| ISMC 100 | 100 | 50 | 5 | 7.7 | 9.56 | 57.36 |
| ISMC 125 | 125 | 65 | 5.3 | 8.2 | 13.1 | 78.60 |
| ISMC 150 | 150 | 75 | 5.7 | 9 | 16.8 | 100.80 |
| ISMC 200 | 200 | 75 | 6.2 | 11.4 | 22.3 | 133.80 |
| ISMC 250 | 250 | 82 | 9 | 14.1 | 34.2 | 205.20 |
| ISMC 300 | 300 | 90 | 7.8 | 13.6 | 36.3 | 217.80 |
| ISMC 400 | 400 | 100 | 8.8 | 15.3 | 50.1 | 300.60 |
Varrsana · producer range
Producer-published Product Range & Sizes, checked 28 October 2026. Web table does not state the dimensional-standard edition; flange and web thickness are not supplied. Source
| Section | Depth D, mm | Flange width B, mm | Web t, mm | Flange T, mm | Weight, kg/m | 6 m length, kg |
|---|---|---|---|---|---|---|
| ISMC 150 | 150 | 75 | Not published | Not published | 16.8 | 100.80 |
| ISMC 200 | 200 | 75 | Not published | Not published | 22.3 | 133.80 |
| ISMC 250 | 250 | 80 | Not published | Not published | 30.6 | 183.60 |
| ISMC 300 | 300 | 90 | Not published | Not published | 36.3 | 217.80 |
| ISMC 400 | 400 | 100 | Not published | Not published | 49.4 | 296.40 |
Not listed yet (no checked source bundled): ISMC 75, ISMC 175, ISMC 225, ISMC 350. Ask us for current mill figures.
Weights are the producers' published nominal figures for carbon steel sections. They are not a structural design reference and do not give load capacity. Request ISMB / ISMC sections.
Frequently asked questions
What is the weight of ISMB 300 per metre?
In the SAIL IS 808:2021 brochure, ISMB 300 (300 × 140 mm) is listed at 46.02 kg/m. Other producers may publish slightly different figures, so confirm the mill and edition on your order.
What does ISMB and ISMC mean?
ISMB is Indian Standard Medium weight Beam (an I-section) and ISMC is Indian Standard Medium weight Channel (a C-section). Their dimensions are defined in IS 808.
How do I calculate the weight of a beam or channel?
Multiply the published weight per metre by the length in metres and by the number of pieces. For example, a 6 m ISMB 100 at 8.95 kg/m weighs 53.7 kg.
Does the chart give load capacity?
No. It is a dimension and weight reference only. Structural design and load capacity must be checked by a qualified engineer to the applicable code.