Heavy Duty Aluminum Truss 400x400: A Buyer's Guide to Specs, Loads, and Selection

August 27, 2026

When you're planning a large stage, exhibition booth, or architectural installation, the truss system is the backbone of your structure. Among the many options, heavy duty aluminum truss 400x400 is a popular choice for its balance of strength, weight, and versatility. But what exactly does "400x400" mean, and how do you know which truss is right for your project? This guide breaks down the specifications, load capacities, and practical considerations you need to make an informed purchase.

Understanding the 400x400 Dimension

The "400x400" refers to the cross-section dimensions of the truss: 400mm by 400mm. This square profile is common in medium-to-large truss systems, offering high load-bearing capacity while remaining manageable in terms of weight and logistics. In our factory, this size is represented by models like the WRS-40 Square Truss and WRS-4060 Square Truss (the latter being 400mm by 600mm).

Key Specifications of Heavy Duty Aluminum Truss 400x400

All truss models we offer are constructed from high-grade aluminum alloy 6082/6061-T6, which provides excellent strength-to-weight ratio and corrosion resistance. The main tubes are typically 50x3mm, with sub tubes and brace tubes varying by model. For example:

WRS-40 Square Truss: Main tube 50x3mm, sub tube 30x2mm, brace tube 25x2mm.
WRS-4060 Square Truss: Main tube 50x3mm, sub tube 50x2mm, brace tube 30x2mm.

These dimensions directly influence the truss's load capacity and rigidity. The TÜV-tested load tables provide precise data for different spans, allowing you to select the right truss for your specific application.

Load Capacity: What the Numbers Mean

Load tables are essential for safe design. They typically list two types of loads:

Distributed load (kg/m): The uniform weight the truss can support along its entire span.
Point load (kg): The maximum concentrated weight applied at a single point (usually the center).

For instance, the WRS-40 Square Truss has a distributed load of 936 kg/m at a 3-meter span, but this drops to 320 kg/m at a 6-meter span. This illustrates a critical principle: the longer the span, the lower the load capacity. Always consult the load table for your exact span and configuration.

Comparing Models: Which 400x400 Truss to Choose?

We offer several square truss models that fall into the 400x400 category or similar. Here's a quick comparison:

WRS-29 Square Truss (290x290mm): Not exactly 400x400, but a lighter-duty option with 50x3mm main tubes and 25x2mm sub tubes. It's suitable for smaller spans and lighter loads.
WRS-30 Square Truss (300x300mm): Similar to WRS-29 but with a slightly larger profile. Load capacities are identical to WRS-29 in the provided data.
WRS-40 Square Truss (400x400mm): A true heavy-duty option with thicker sub tubes (30x2mm) and brace tubes (25x2mm). Ideal for medium spans up to 8 meters.
WRS-4060 Square Truss (400x600mm): This rectangular truss offers higher load capacity in one direction, with larger sub tubes (50x2mm). It's excellent for long spans up to 9 meters.
WRS-52 Square Truss (520x520mm): An even larger square truss, providing the highest load capacities in this lineup, suitable for spans up to 12 meters.

For a true 400x400 heavy-duty system, WRS-40 is your direct match. However, if you need extra strength for longer spans, consider WRS-4060 or WRS-52.

Practical Applications

Heavy duty aluminum truss 400x400 is commonly used for:

Concert stages and event structures: Supporting lighting, sound, and video equipment.
Exhibition booths: Creating large, open-span displays.
Architectural installations: Permanent or semi-permanent structures like walkways or canopies.
Outdoor events: Where wind loads and safety are critical.

Sourcing Tips for Buyers

When purchasing heavy duty aluminum truss, consider the following:

Check certifications: Ensure the truss is TÜV-tested and manufactured under ISO 9001:2015 quality management. Our factory holds these certifications.
Review load tables: Always verify that the load capacity meets your requirements. Don't rely on generic ratings; use the specific load table for the model you're considering.
Consider the complete system: Truss is just one component. You'll need compatible accessories like base plates, corner blocks, and spigots. Our range includes various truss types (ladder, triangle, square) to match your needs.
Ask about materials: 6082/6061-T6 aluminum is a mark of quality. Ensure the supplier uses this grade.
Factory-direct advantages: Buying directly from a factory can offer better customization and support. We offer worldwide shipping.

Frequently Asked Questions

Q: What is the maximum span for a 400x400 truss? A: The maximum span depends on the specific model and load. For example, the WRS-40 Square Truss has load data up to 8 meters, while the WRS-4060 extends to 9 meters. Always refer to the load table for safe spans.

Q: Can I use 400x400 truss for outdoor stages? A: Yes, but you must account for wind loads and use proper anchoring. The aluminum alloy 6082/6061-T6 is corrosion-resistant, but you should still protect the truss from harsh weather.

Q: What is the difference between distributed and point load? A: Distributed load is the uniform weight across the span, while point load is a concentrated weight at a specific location. Both are listed in the load tables, and your design must satisfy both conditions.

Q: Do you offer custom lengths? A: We provide standard lengths from 50cm to 400cm for most models. For custom lengths, please contact us directly to discuss your project.

Conclusion

Choosing the right heavy duty aluminum truss 400x400 requires careful analysis of your load requirements, span, and application. By understanding the specifications and load tables, you can make a safe and cost-effective decision. Our range of TÜV-tested trusses, including the WRS-40, WRS-4060, and WRS-52, offers reliable options for various projects. For more details, explore our product pages:

If you have specific questions or need engineering support, our team is ready to assist with your project.