120×120×3.5 mm S420MC–S700MC High-Strength Square Hollow Section
120x120x3.5mm Steel high-strength square tube in S420MC, S500MC, S600MC, S700MC to EN 10219 / EN 10149-2, with an uncoated steel surface suitable for further processing or painting. Nominal weight 12.556 kg/m.
Minimum order
Minimum 10 t per size. If the size is already in the current production cycle, we can accept orders from 5 t. Standard length 6 m; 4–12 m on request. We confirm the minimum, lead time and grade in your quote.
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Minimum order: 10 t per size (from 5 t if the size is in production)
Applications & Usage
This medium-duty Steel high-strength square tube is commonly specified for furniture manufacturing, enclosures, brackets, and general fabrication. The 3.5mm wall thickness provides excellent strength-to-weight ratio while maintaining workability. The natural mill finish provides a cost-effective solution for applications where aesthetics are secondary. Available in standard lengths of 6m, this profile can be easily cut, drilled, and welded to suit your specific requirements.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 120mm × 120mm × 3.5mm |
| Weight per Meter | 12.556 kg/m |
| Material | Steel |
| Alloy/Grade | S420MC, S500MC, S600MC, S700MC |
| Standard | EN 10219 / EN 10149-2 |
| Standard Length | 6m |
| Minimum Order per Size | 10 t |
| Cut-to-Length Range | 4000 – 12000 mm |
Section Properties
Nominal values calculated from nominal dimensions to EN 10219-2.
| Property | Value |
|---|---|
| Cross-sectional area(A) | 16.0 cm² |
| Second moment of area(I) | 358 cm⁴ |
| Radius of gyration(i) | 4.73 cm |
| Elastic section modulus(Wel) | 59.7 cm³ |
| Plastic section modulus(Wpl) | 69.4 cm³ |
| Torsional inertia constant(It) | 563 cm⁴ |
| Torsional modulus constant(Ct) | 89.7 cm³ |
| Surface area per metre(As) | 0.468 m²/m |
| Length per tonne | 79.6 m |
High-strength grades for this size
Strength and indicative capacity for each grade this size is rolled in, compared with the S355J2H wall that carries the same bending load in the same outer size.
| Grade | Min. yield ReH | Tensile Rm | Bending Wel·ReH | Axial A·ReH | S355J2H equivalent |
|---|---|---|---|---|---|
| S420MC | 420 MPa | 480–620 MPa | 25.1 kNm | 672 kN | 4.5 mm · 15.9 kg/m (+27%) |
| S500MC | 500 MPa | 550–700 MPa | 29.8 kNm | 800 kN | 6 mm · 20.7 kg/m (+65%) |
| S600MC | 600 MPa | 650–820 MPa | 35.8 kNm | 960 kN | 8 mm · 26.4 kg/m (+110%) |
| S700MC | 700 MPa | 750–950 MPa | 41.8 kNm | 1120 kN | 10 mm · 31.8 kg/m (+154%) |
In S700MC, this section (12.6 kg/m) carries the elastic bending load of a 10 mm S355J2H wall in the same outer size (31.8 kg/m), which is 154% heavier per metre.
Indicative values from nominal dimensions: Wel × ReH and A × ReH, without buckling, cross-section class or partial safety factors. Not a design check.
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