All You Need to Know About Square Hollow Sections
22 August 2025
Square Hollow Sections (SHS) are widely used in construction for their pleasing appearance and outstanding structural advantages. They are manufactured by forming steel tubing into precise square cross-sections with hollow interiors. The great thing about SHS is that, unlike solid steel bars or I-beams, they combine the structural integrity of steel with the weight-saving benefits of their hollow design.Â
Here, we take a closer look at this crucial construction component, known for its exceptional versatility and strength.
The Key Properties and Specifications of SHS
What distinguishes SHS from other structural steel products is the uniform square profile and consistent wall thickness throughout the section. This geometry provides equal strength in both horizontal directions, making them particularly suitable for applications requiring bidirectional load resistance. Unlike Universal Beams (UB) or Universal Columns (UC), which are designed for specific loading directions, SHS offer multidirectional structural performance in a compact, aesthetically attractive package.Â
The manufacturing process typically involves either hot-forming seamless tubes or cold-forming welded tubes. British Standard BS EN 10210 governs hot-finished SHS, whilst BS EN 10219 covers cold-formed welded sections. These standards specify dimensional tolerances, chemical composition, and mechanical properties.
The weight per metre varies considerably with size, and steel grades typically include S235, manufactured in wall thicknesses of up to 120mm. SHS offers excellent torsional resistance due to its closed profile geometry. These are the various strengths, sizes and tolerances.
Common Applications and Uses in Construction
SHS excel in numerous construction applications due to their versatility and structural efficiency. In residential construction, they're commonly used for steel frame extensions, supporting RSJs, and creating feature columns where both strength and appearance matter. Their clean lines make them an ideal choice for exposed structural elements in contemporary architecture.
Commercial applications include portal frame construction, mezzanine floors, and curtain wall systems. The agricultural sector frequently employs SHS for livestock buildings, grain stores, and machinery sheds due to their corrosion resistance when properly treated and their ability to span large distances economically.
Architectural applications showcase SHS in beams, columns, and braces in buildings, bridges, and other structures. SHS steel is popular for fabricating fences, gates, and railings due to its strength and visual appeal. Infrastructure projects utilise SHS for pedestrian bridges, telecommunications masts, and transport shelters, benefiting from their excellent strength-to-weight characteristics.
The Advantages and Benefits of Using Square Hollow Sections
The ultimate advantage of SHS is their exceptional strength-to-weight ratio. The hollow design removes material from the neutral axis where it contributes least to structural performance, maximising efficiency whilst minimising weight. This translates to reduced foundation requirements and lower transportation costs.
Cost-effectiveness is another huge benefit. SHS are easier to handle and install than equivalent solid sections, reducing labour time and associated costs. Their uniform profile simplifies connection details, whether bolted or welded, streamlining fabrication processes.
Aesthetically, SHS offer clean, modern lines that integrate well with contemporary architectural styles. The closed profile eliminates internal surfaces that can collect debris or moisture, thereby improving long-term durability and reducing maintenance requirements compared to open sections, such as channels or angles.
Selection Criteria and Installation Considerations
Selecting an appropriate SHS requires careful consideration of load requirements, span lengths, and deflection limits. You need to evaluate both ultimate and serviceability limit states, considering factors such as wind loading, imposed loads, and dynamic effects. The section's radius of gyration and slenderness ratio are critical for buckling calculations.
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