The Complete Guide to Spigot Truss for Stage and Events: Specs, Loads, and Selection Tips
Introduction
Spigot truss is a popular choice for stage and event structures due to its quick assembly and reliable connection. Unlike bolted or welded systems, spigot truss uses a male-female pin connection that allows for fast setup and teardown—ideal for touring, outdoor events, and temporary installations. This guide covers the key specifications, load capacities, and selection criteria for spigot truss, with reference to real TÜV-tested models.
Material and Construction
Most spigot trusses are made from aluminum alloy 6082 or 6061-T6, which offers a good strength-to-weight ratio and corrosion resistance. The main tubes typically use 50x3mm, while sub and brace tubes vary by model. For example:
- WRF-29 Ladder Truss: Main tube 50x3mm, sub tube 25x2mm, brace 20x2mm.
- WRT-29 Triangle Truss: Main tube 50x3mm, sub tube 30x2mm, brace 20x2mm.
- WRS-29 Square Truss: Main tube 50x3mm, sub tube 25x2mm, brace 20x2mm.
- WRS-40 Square Truss: Main tube 50x3mm, sub tube 30x2mm, brace 25x2mm.
- WRS-4060 Square Truss: Main tube 50x3mm, sub tube 50x2mm, brace 30x2mm.
The choice of alloy and tube thickness directly affects load capacity and weight. For heavy-duty applications, models with larger sub tubes (e.g., WRS-4060) provide higher rigidity.
Load Capacity Considerations
Load capacity is the most critical factor when selecting spigot truss. All data below is from TÜV-tested tables. Always consult an engineer and follow local safety codes.
WRF-29 Ladder Truss
- Spans: 1–6 m
- Distributed load (kg/m) / Point load (kg):
- 1 m: 990 / 990
- 2 m: 340 / 340
- 3 m: 168 / 115
- 4 m: 87 / 43
- 5 m: 51 / 20
- 6 m: 26 / 10
Best for lightweight applications like banner hanging or small lighting rigs.
WRT-29 Triangle Truss
- Spans: 3–8 m
- Distributed load (kg/m) / Point load (kg):
- 3 m: 371 / 557
- 4 m: 250 / 500
- 5 m: 139 / 348
- 6 m: 109 / 327
- 7 m: 85 / 298
- 8 m: 67 / 268
Ideal for medium-duty truss structures where a triangular profile is acceptable.
WRS-29 Square Truss (290x290mm)
- Spans: 1–6 m
- Distributed load (kg/m) / Point load (kg):
- 1 m: 1942 / 1942
- 2 m: 976 / 1899
- 3 m: 658 / 1766
- 4 m: 488 / 1466
- 5 m: 392 / 1150
- 6 m: 317 / 948
Offers excellent load capacity for its size. Suitable for medium-sized stages.
WRS-30 Square Truss (300x300mm)
- Same load table as WRS-29 up to 6 m.
WRS-40 Square Truss (400x400mm)
- Spans: 3–8 m
- Distributed load (kg/m) / Point load (kg):
- 3 m: 936 / 718
- 4 m: 732 / 680
- 5 m: 465 / 644
- 6 m: 320 / 612
- 7 m: 232 / 585
- 8 m: 176 / 560
A step up for larger spans and heavier loads.
WRS-4060 Square Truss (400x600mm)
- Spans: 4–9 m
- Distributed load (kg/m) / Point load (kg):
- 4 m: 805 / 1610
- 5 m: 560 / 1400
- 6 m: 403 / 1209
- 7 m: 301 / 1054
- 8 m: 247 / 988
- 9 m: 210 / 945
Rectangular profile provides high point load capacity—great for heavy lighting or video walls.
WRS-52 Square Truss (520x520mm)
- Spans: 7–12 m
- Distributed load (kg/m) / Point load (kg):
- 7 m: 460 / 1255
- 8 m: 346 / 1130
- 9 m: 303 / 1008
- 10 m: 241 / 923
- 11 m: 182 / 885
- 12 m: 164 / 782
Designed for long-span applications like main stage roofs.
WRS-5060 Square Truss (500x600mm)
- Spans: 4–9 m
- Load table identical to WRS-4060.
How to Choose the Right Spigot Truss
- Determine span and load: Calculate the total weight of equipment (lights, speakers, video) and choose a truss with sufficient capacity at that span. Use the distributed load for evenly hung items, point load for concentrated loads.
- Consider profile shape: Ladder truss is lightweight and cheap but limited. Triangle truss offers good strength for its weight. Square truss is versatile and commonly used for stage structures.
- Check connection compatibility: Spigot truss from the same series can be connected end-to-end. Ensure pin sizes match. Most spigot trusses use a standard 12mm or 16mm pin.
- Verify certification: Look for TÜV-tested models to ensure safety. All models listed above are TÜV-certified.
Sourcing Tips for Buyers
- Factory-direct purchasing: Buying directly from a manufacturer (like a China-based factory) can reduce costs. Ensure they provide load test reports and material certificates.
- Minimum order quantities: Some factories require MOQs for custom lengths. Standard lengths (50 cm to 400 cm) are usually available.
- Shipping and packaging: Truss is typically packed in bundles or crates. Confirm packaging details to avoid damage.
- Custom colors: Many manufacturers offer powder coating in RAL colors for branding.
FAQ
Q1: What is the difference between spigot truss and bolt truss?
A: Spigot truss uses a pin connection that slides into the adjacent section and is secured with a locking pin. Bolt truss uses bolts and nuts. Spigot is faster to assemble but may have slightly lower load capacity than bolted connections for very heavy loads.
Q2: Can I mix different series of spigot truss?
A: Generally, no. Different series have different tube sizes and spigot diameters. Always use the same series for a continuous run. Adapters may be available but are not recommended for load-bearing structures.
Q3: How do I read the load table?
A: For a given span (distance between supports), the distributed load is the maximum weight per meter that can be evenly hung across the entire span. The point load is the maximum weight that can be applied at a single point (usually the center). These values are not additive; use the more restrictive condition.
Q4: What safety factors are applied to these load tables?
A: The load tables are based on TÜV testing with a safety factor typically of 4:1 for ultimate strength. Always follow local regulations and consult a structural engineer for your specific setup.
Conclusion
Spigot truss for stage and events offers a balance of speed and strength. By understanding the material specs and load capacities of models like WRF-29, WRT-29, and WRS series, you can select the right truss for your project. Always prioritize safety, verify certifications, and work with reputable suppliers.