Stacked MS square hollow steel pipes, related to MS square pipe weight per meter.
MS Square Pipe Weight per Meter (kg/m): Formula & Chart
An MS square pipe — formally a Square Hollow Section (SHS) — is a structural steel tube with a hollow square cross-section, used in building frames, trusses, gates, railings, and fabricated structures. In India, MS square pipes are manufactured to IS 4923:2016, which defines tolerance, corner radius, finish, and testing requirements. When you order a "40 × 40 × 2.0" pipe, that's a 40mm outer dimension with 2.0mm wall thickness to this standard.
The Formula
Steel cross-sectional area: Asteel = 4 × t × (B − t) (mm²), where B is outer size and t is wall thickness.
Weight per metre: kg/m = density (kg/m³) × Asteel (mm²) × 10⁻⁶
For standard MS steel (7850 kg/m³), this simplifies to the shortcut formula: kg/m = 0.0314 × t × (B − t)
Worked Example
For a 40×40mm pipe with 2.0mm wall thickness: kg/m = 0.0314 × 2.0 × (40 − 2.0) = 0.0314 × 2.0 × 38 = 2.39 kg/m. For a standard 6-metre length: 2.39 × 6 = 14.34 kg total.
Reference Weight Chart (Calculated via the Formula Above)
| Outer Size (mm) | Thickness (mm) | Weight (kg/m) | Weight for 6m (kg) | Typical Use |
|---|---|---|---|---|
| 20×20 | 2.0 | 1.13 | 6.79 | Light structures, furniture, display racks |
| 25×25 | 2.0 | 1.44 | 8.66 | Light structures, partition frames |
| 30×30 | 2.0 | 1.76 | 10.56 | General fabrication |
| 40×40 | 2.0 | 2.39 | 14.34 | General fabrication, machine bases |
| 50×50 | 3.0 | 4.43 | 26.58 | Building/civil, gates, railings |
| 65×65 | 3.0 | 5.84 | 35.04 | Building/civil, cross-bracing |
| 75×75 | 4.0 | 8.92 | 53.52 | Columns, roof trusses |
| 100×100 | 4.0 | 12.06 | 72.36 | Heavy columns, structural framing |
Calculated at standard density 7850 kg/m³. Actual weight can vary ±2–3% due to manufacturing tolerance, corner radius effects, and coating. For invoicing, load calculations, or structural design, always use the actual measured weight or the Mill Test Certificate (MTC) value.
Common Applications by Size
- Light structures (20×20, 25×25mm): furniture, display racks, partition frames
- General fabrication (30×30, 40×40, 50×50mm): machine bases, control panels, mounting structures
- Building & civil (65×65, 75×75, 100×100mm and larger): columns, cross-bracing, roof trusses, gates, railings
Thinner walls (1.2–2.0mm) suit light duty; thicker walls (3.2–4.0mm) suit structural and heavy-load applications.
Frequently Asked Questions
What is the exact formula for MS square pipe weight per metre?
kg/m = 0.0314 × t × (B − t), where B is outer size in mm and t is wall thickness in mm, using standard MS density of 7850 kg/m³.
How do I calculate total weight for a custom length?
Multiply the kg/m value from the formula or chart by your actual pipe length in metres.
What is the standard length of MS square pipe supplied?
6 metres is the most common standard stock length in India, though other lengths may be available on request.
Is the IS 4923 standard mandatory for MS square pipes in India?
It's the reference Indian Standard defining tolerance, corner radius, and testing requirements — reputable suppliers manufacture and test against it, and it's worth confirming compliance when ordering.
Why does actual pipe weight differ slightly from the calculated value?
Manufacturing tolerance (typically ±2–3%), rounded corner radius, and any coating or galvanising cause small deviations from the theoretical formula weight — verify with the MTC for billing-critical orders.
Share size, thickness, and quantity — Vishwageeta Ispat will confirm kg/m and a mill-linked quote within 24 hours.
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