The Ultimate Guide to SHS Steel Sizes in Australia

SHS Steel Sizes

If you’re working in construction, engineering, metal fabrication, or even DIY projects, you’ve probably come across the term SHS steel. But what exactly is it? And more importantly, how do you find the right SHS steel size for your job?

In this guide, we’re breaking down everything you need to know about SHS steel sizes in Australia, including a handy SHS steel sizes chart, different materials like galvanised, mild, and stainless steel, and where you can download a PDF for quick reference.

Let’s dive right in.

What is SHS Steel?

SHS stands for Square Hollow Section. As the name suggests, it’s a type of steel tube with a square cross-section and hollow inside. SHS steel is known for its clean, symmetrical appearance and strong structural integrity, making it a go-to for a wide range of building and construction applications.

You’ll find SHS steel used in:

  • Structural frameworks 
  • Furniture manufacturing 
  • Signposts 
  • Gates and fences 
  • Commercial and residential buildings 

Standard SHS Steel Sizes in Australia

In Australia, SHS steel comes in standardised metric sizes, which makes planning and procurement easier for architects, builders, and engineers.

The most common SHS steel sizes in mm include:

Size (mm x mm)Wall Thickness (mm)Approx. Weight (kg/m)
20 x 201.60.94
25 x 251.61.20
30 x 302.01.80
40 x 402.53.10
50 x 502.5 / 3.0 / 4.04.00–6.20
65 x 653.0 / 4.0 / 5.06.50–10.20
75 x 753.0 / 4.0 / 5.07.60–12.00
100 x 1003.0 / 4.0 / 5.0 / 6.010.00–17.00
125 x 1255.0 / 6.018.00–21.50

Note: These are general sizes and weights. Always refer to your supplier or engineering drawings for exact specs.

Why Are SHS Steel Sizes in Australia Different?

Australia follows the AS/NZS 1163 standard for cold-formed structural steel, which means SHS steel products here are designed to comply with local construction codes. That includes:

  • Precise mill tolerances 
  • Steel grade consistency (often C350 or C450) 
  • Corrosion resistance where required 

That’s why it’s important to refer to SHS steel sizes Australia-specific charts when building or fabricating locally, especially when using galvanised or stainless SHS.

SHS Steel Sizes Chart (Australia)

To make your planning easier, here’s a quick-reference SHS steel sizes chart for Australia:

SHS Size (mm)Wall Thickness (mm)Weight (kg/m)Material Options
25 x 251.61.20Mild, Galvanised
50 x 502.54.00Mild, Galvanised
65 x 653.06.50Mild, Stainless
75 x 753.07.60Mild, Galvanised
100 x 1005.014.70Mild, Stainless, Galv.

Want a downloadable version?
 👉 Download SHS Steel Sizes Chart PDF

SHS Mild Steel Sizes

Mild steel SHS is the most commonly used variant due to its affordability and weldability. It’s perfect for:

  • General structural use 
  • Internal frameworks 
  • Fabricated parts 

Popular sizes:

  • 25 x 25 x 1.6 mm 
  • 50 x 50 x 2.5 mm 
  • 100 x 100 x 4.0 mm 

SHS Galvanised Steel Sizes

Galvanised SHS steel is coated with zinc, offering superior corrosion protection. Ideal for outdoor or coastal applications, and the pre-galvanised product name is called Duragal.

Common Duragal SHS sizes include:

  • 65 x 65 x 3.0 /4.0 / 5.0 / 6.0 mm         
  • 75 x 75 x 3.0 / 4.0 / 5.0 / 6.0 mm
  • 89 x 89 x 3.5 / 5.0 / 6.0 mm
  • 100 x 100 x 4.0 / 5.0 / 6.0 mm
  • 125 x 125 x 4.0 / 5.0 / 6.0 / 8.0 / 9.0 /10.0
  • 150 x 150 x 5.0 / 6.0 / 8.0 / 9.0 /10.0

Tip: Always check the galvanising method — hot-dip or pre-gal — depending on the job.

SHS Stainless Steel Sizes

SHS stainless steel is used where strength meets aesthetics — think architectural frames, hospitals, or high-hygiene environments.

Available in grades like 304 and 316, typical sizes include:

  • 25 x 25 x 1.6 mm 
  • 50 x 50 x 2.0 mm 
  • 100 x 100 x 3.0 mm 

Though more expensive, it offers unmatched rust resistance and a sleek finish.

SHS Steel Sizes Chart PDF — Why You Need One

Working on-site or in the workshop? Having a SHS steel sizes chart PDF on hand can save a ton of time. Most steel suppliers or fabrication companies will offer downloadable versions.

Use it to:

  • Calculate weights and quantities 
  • Double-check material specs 
  • Streamline your ordering process 

SHS Steel Sizes in mm — The Metric Advantage

Australia uses the metric system (millimetres), so all SHS dimensions follow mm-based sizing. This makes it easy to scale, compare, and cut without conversions.

Bonus Tip: To convert kg/m to total weight, just multiply by your required length.

Frequently Asked Questions (FAQs)

1. What is the most common SHS steel size in Australia?

The most used size is 50 x 50 x 2.5 mm mild steel — perfect for general structural and fabrication work.

2. Can I get custom SHS sizes?

Yes, many suppliers offer custom-cut lengths and thicknesses based on project requirements.

3. Where can I download an SHS steel size chart in PDF?

Most steel product websites or suppliers like BlueScope or Lysaght offer PDF charts for free download. You can also request one from your local steel merchant.

4. What’s the difference between galvanised and stainless SHS steel?

  • Galvanised SHS is zinc-coated mild steel — cost-effective for outdoor use. 
  • Stainless SHS is solid stainless steel — more durable and rust-resistant, especially in harsh conditions. 

5. Is SHS stronger than RHS (Rectangular Hollow Section)?

Not necessarily — strength depends on wall thickness and application. SHS is more symmetrical, while RHS might be stronger in one direction due to its shape.

Final Thoughts

When it comes to selecting the right SHS steel size in Australia, knowing your options — from mild to galvanised to stainless, and the standard mm-based dimensions — makes all the difference.

Whether you’re designing a house frame, welding a gate, or planning a large commercial build, refer to the SHS steel sizes chart and pick the best fit for safety, strength, and cost-efficiency.

👉 Don’t forget to download the SHS steel sizes chart PDF and bookmark this guide for future reference!