ConstructionStructural Columns
Load-bearing columns and beam frames in construction projects.
IS 4923 | SRMB Realfabrica
Square Hollow Section Manufacturer in India: IS 4923
If you're sourcing a square tube, square pipe, MS square pipe, or square hollow section for a structural, architectural, or fabrication project, this page covers everything you need to specify one correctly: size range, thickness options, applicable IS code, grade, tolerances, and where this shape fits best on a project. SRMB Realfabrica manufactures square hollow sections at SRMB Srijan's integrated steel plant in Durgapur, West Bengal, rolling our own hot rolled coil into finished square sections on Cold Formed ERW lines, under IS 4923.
IS 4923
Product Standard
YST 240
Top Grade
20×20
Smallest Size mm
Durgapur
Integrated Plant
IS 4923YST 210 & YST 24020×20 to 91.5×91.5 mm1.0–4.8 mm thick6–7 m lengths
Square Hollow Section — At a Glance
IS 4923
Standard
YST 240
Top Grade
20–91.5
Size Range mm
ERW
Cold Formed Process
Square Hollow Section — Product Description
A square hollow section distributes load equally in both directions — the right choice for columns, posts, and frames where balanced strength on both axes matters. The hollow closed form resists twist and provides flush flat faces for bolted or welded connections.
SRMB Realfabrica manufactures SHS at our integrated plant in Durgapur — from rolled coil we produce ourselves, through Cold-Formed ERW lines, to IS 4923 certified finished section. Every batch is tested for mechanical and chemical compliance before despatch.
IS 4923YST 210 & YST 24020×20 to 91.5×91.5 mm1.0–4.8 mm thick6–7 m lengths
IS 4923 Certified
Hollow steel sections standard for structural use
YST 210 & YST 240
Standard grades; higher grades on request
CF ERW Process
Cold-Formed Electric Resistance Welded
IMS Certified
Integrated management system certification
Batch-Level Testing
Mechanical and chemical compliance per batch
Primary Steel Producer
In-house rolled coil to finished section, Durgapur
Specifications
| Specification | Detail |
|---|---|
| Product standard | IS 4923 (Hollow steel sections for structural use, square and rectangular) |
| Size range | 20mm x 20mm to 91.5mm x 91.5mm |
| Thickness range | 1.0mm to 4.8mm |
| Grade | YST 210, YST 240 (higher grades also manufactured on request) |
| Standard length | 6 metres to 7 metres, precision cut on request |
| Surface finish | Black, smooth finish |
| Input material | Hot rolled coil conforming to IS 10748 |
| Forming process | Cold Formed ERW (Electric Resistance Welded) |
We manufacture across a range of intermediate sizes between 20mm x 20mm and 91.5mm x 91.5mm, including commonly specified sizes such as 25x25, 32x32, 38x38, 40x40, 49.5x49.5, 60x60, 65x65, 72x72, and 80x80mm. Not every size is available in every thickness listed above, so for a specific size and thickness combination, our technical team can confirm current availability and share a formal specification sheet.
| Grade | Yield Strength (YST), Minimum | Ultimate Tensile Strength (UTS), Minimum | Elongation, Minimum |
|---|---|---|---|
| YST 210 | 210 MPa | 330 MPa | 12% (up to 25.4mm), 20% (above 25.4mm) |
| YST 240 | 240 MPa | 410 MPa | 10% (up to 25.4mm), 15% (above 25.4mm) |
These figures represent minimum guaranteed values, not typical or average values, so the actual mechanical performance of any batch we supply meets or exceeds what's shown here.
| Parameter | Tolerance |
|---|---|
| Outside dimension | +/- 1% of nominal size, with a minimum of +/- 0.50mm |
| Thickness | +/- 10% |
| Squareness | 90 degrees +/- 2 degrees |
| Corner radius | 3t maximum (t = wall thickness) |
| Weight, individual lengths | +10% / -8% |
| Weight, 10 tonne lot | +/- 7.5% |
Holding these tolerances consistently, length after length and batch after batch, is a direct result of the Cold Formed ERW process running on tightly controlled, in-house rolled coil rather than externally sourced material of varying chemistry.
Where Square Hollow Sections Are Used
Construction
SecurityGate Frames
Security gates and entrance frames in residential and commercial settings.
IndustrialStorage Racks
Industrial shelving, pallet racking, and warehouse storage systems.
ArchitecturalGlass Partitions
Framing for glass partition systems in offices and commercial interiors.
EnergySolar Mounting
Mounting structures for rooftop and ground-mounted solar panel arrays.
FurnitureFurniture Frames
Designer furniture, tables, chairs, and modular shelving units.
Why Square Hollow Sections Are Specified
1
Equal Axial Strength
Symmetrical profile carries load evenly in all directions — ideal for columns and vertical framing.
2
Clean Corner Geometry
Flat, equal faces simplify bolted and welded connections without orientation checks.
3
Easy Fabrication
Weldable with standard MS electrodes, no preheating required under normal site conditions.
4
IS 4923 Certified
Manufactured to IS 4923 with batch-level testing and full traceability back to production.
Handling and Site Considerations
Weldability
YST 210 and YST 240 grade square hollow sections have low carbon content and are readily weldable using standard fabrication welding processes, without requiring preheating under normal site conditions.
Open ends
Sections are supplied with open ends as standard. Where corrosion protection of the internal surface is required, sealing or capping should be planned into the fabrication sequence.
Packaging
Sections are bundled and strapped for safe transit and site handling, with bundle labelling that identifies size, thickness, grade, and batch to support easy identification on receipt at site.
Frequently Asked Questions
A square hollow section is a structural steel tube with a square cross section and hollow core, used as a load bearing member. It's also called square tube, square pipe, MS square pipe, or MS box section.
We manufacture square hollow sections from 20mm x 20mm to 91.5mm x 91.5mm, including standard sizes such as 25x25, 40x40, 60x60, and 80x80mm, under IS 4923.
Our square hollow sections are available in thicknesses from 1.0mm to 4.8mm. Not every size is available in every thickness, so please confirm your exact combination with our technical team.
SRMB Realfabrica square hollow sections conform to IS 4923, which covers hollow steel sections for structural use in square and rectangular profiles.
We manufacture square hollow sections in YST 210 and YST 240 as standard grades, with higher grades available on request for projects requiring greater yield strength.
Standard supply length is 6 metres to 7 metres. Precision cut lengths can be arranged on request for specific project requirements.
Square hollow sections are used for structural columns, machinery framework, furniture manufacturing, architectural elements, sign and billboard supports, and industrial guardrails.
Outside dimension tolerance is +/- 1% (minimum +/- 0.50mm), thickness tolerance is +/- 10%, and squareness is held to 90 degrees +/- 2 degrees, as per IS 4923.
Controlled chemistry and a smooth surface finish support good corrosion resistance. Sealing all open ends with a welded end plate further protects against internal corrosion over the section's working life.
Yes. SRMB Realfabrica square hollow sections can be welded using standard MS electrodes without any preheating required beforehand.
For weight per length and a detailed size chart for your required specification, please contact our technical team or download our product brochure for the latest data.
Square sections have equal sides and spread load evenly in all directions, suiting columns. Rectangular sections have unequal sides, giving more strength along one axis, suiting beams and trusses.
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