How to Choose the Right SHS Steel Size for Your Building Project

When it comes to construction, choosing the right materials makes all the difference in safety, cost, and durability. One of the most common materials in Australian projects is SHS steel (Square Hollow Section). But with so many different SHS steel sizes available, how do you know which one is right for your project?

This guide will help you understand SHS steel, explore standard sizes, and give you practical tips on choosing the right option.

What is SHS Steel?

SHS (Square Hollow Section) is a type of structural steel that comes in a square shape with hollow interiors. It is widely used in construction, manufacturing, and engineering because of its:

• Strength and durability
• Easy welding and fabrication
• Clean, modern aesthetic for exposed structures
• Ability to handle heavy loads while reducing weight

Unlike solid steel, SHS reduces material usage without compromising strength, making it a cost-effective choice for builders.

Standard SHS Steel Sizes in Australia

In Australia, SHS steel is manufactured in a variety of sizes and thicknesses to suit different projects.

Common SHS dimensions include:

• 20 × 20 mm to 400 × 400 mm
• Wall thicknesses ranging from 1.6 mm to 16 mm

For example:

• 50 × 50 × 2 mm SHS → light framing or residential work
• 100 × 100 × 5 mm SHS → medium-load structural work
• 200 × 200 × 8 mm SHS → large-scale commercial and industrial projects

Most suppliers also offer SHS in galvanised and non-galvanised finishes, depending on whether the steel will be exposed to weather.

Factors to Consider When Choosing SHS Steel Size

When selecting SHS dimensions, it’s not just about picking a random size. Here are the key factors to consider:

1. Load-Bearing Requirements
   • How much weight will the SHS need to support?
   • Heavier loads require thicker walls and larger sizes.
2. Project Type
   • Residential: lighter SHS often works fine.
   • Commercial/industrial: thicker SHS is essential for compliance and safety.
3. Compliance & Building Codes
   • Always check local standards, such as AS/NZS 1163 in Australia, which governs structural steel.
4. Environment
   • For outdoor projects, galvanised SHS prevents rust and corrosion.
   • Indoor use may not require galvanisation.

SHS Steel vs RHS Steel: Which Should You Choose?

Many builders compare SHS (Square Hollow Section) with RHS (Rectangular Hollow Section).

In short: If you need uniform strength, SHS is ideal. If you need directional strength, RHS may be better.

Cost of SHS Steel Sizes in Australia

The cost of SHS steel depends on:

• Size and wall thickness
• Galvanisation
• Supplier and location

On average, you can expect:

• Small SHS (20–50 mm): $15–$40 per length
• Medium SHS (75–150 mm): $50–$150 per length
• Large SHS (200+ mm): $200–$500 per length
  

Pro Tip: Always compare prices between local suppliers and national distributors to get the best deal.

Where to Buy SHS Steel in Australia

You can find SHS steel at:

• Local steel suppliers and fabricators
• National distributors like Orrcon Steel, BlueScope, or Midalia Steel
• Specialised online suppliers

When buying, look for:
-> Australian standards certification
-> Reliable delivery timelines
-> Options for custom cutting and galvanisation

Why SHS Cleats Are Essential for Steel-to-Timber Connections

If you’re using SHS steel in construction, chances are you’ll need SHS cleats to connect beams, columns, or timber members.

Benefits of SHS cleats include:

• Strong and secure joints
• Faster installation
• Compliance with safety standards
• Compatibility with different SHS dimensions

👉 Using the right cleat size ensures your connections stay durable and safe for years.

Final Thoughts

Choosing the right SHS steel size is a critical decision in any building project. The wrong choice can affect safety, cost, and long-term performance. By understanding SHS steel sizes, compliance requirements, and your project’s load needs, you’ll be able to make a smarter choice. And don’t forget: pairing your SHS with high-quality SHS cleats will give you the strongest and most reliable connections.