Aluminium T-Slot Extrusion Series: 3 Proven Options for Stronger Builds
3 minute read
Published 17 September 2026
Choosing the right aluminium t-slot extrusion series can make or break a build. SlotPro offers different ranges, 2 series, 3 series, and 4 series, each built around a different profile size: 20×20, 30×30, and 40×40. Here’s how to pick the one that fits your project.
All three series share the same core design. Every profile is engineered for structure and built for speed, assembled using only a set of hex keys. No welding, no drilling, no specialist tools. The difference comes down to scale and load.
2 series: The 20×20 Aluminium T-Slot Extrusion for Compact Builds
The 2 series is SlotPro’s smallest profile, built around the 20×20 extrusion with a 6mm T-slot on each face.
It’s designed for lightweight jobs in tight spaces, not for heavy structural loads.
This series suits small automation systems, display frames, and compact machine structures. Four open T-slots on each profile allow fast mounting of connectors and accessories, so builds go together quickly without extra fabrication.
If your project needs to fit into a confined space and doesn’t carry significant weight, the 2 series is the starting point.
3 series: The 30×30 Aluminium T-Slot Extrusion for Everyday Flexibility
The 3 series steps up to the 30×30 profile, built for medium load frame builds and structural assemblies. It’s the midweight option in the SlotPro range.
This series suits machine frames and guards, workstations, enclosures, display structures, and small automation or support frames. It’s a practical choice when a project has outgrown the 2 series but doesn’t need the full strength of the 4 series.
4 series: The 40×40 Aluminium T-Slot Extrusion for Heavy-Duty Industrial Builds
The 4 series is SlotPro’s most popular profile, built around the 40×40 extrusion. It’s designed for heavy-duty industrial applications where strength and durability matter most.
This series is a common choice for machine frames, safety guarding, and workstations that need to handle real loads day after day, including automation applications like conveyors. It’s also the go-to option for OEMs and custom machine builders who need a system that performs at scale without sacrificing the same weld-free, modular assembly.
If your build needs to carry weight, resist vibration, or support ongoing industrial use, the 4 series is built for the job.
How to Choose the Right Aluminium T-Slot Extrusion Series
Picking between 2 series, 3 series, and 4 series comes down to three questions. How much load does the structure need to carry? How much space do you have to work with? And how much room do you need for future expansion?
Small, lightweight builds like display frames and compact machine structures suit the 2 series. Medium load projects, including general machine frames and workstations, suit the 3 series. Heavyweight assemblies, including automation applications like conveyors and full safety guarding systems, call for the 4 series.
Because all three series share compatible connectors, brackets, and fasteners, it’s also possible to mix series within a single project, using a lighter profile for non-structural elements and a heavier one where the load demands it.
SlotPro supports every series with local NZ stock, precision machining to spec, and CAD files for SolidWorks, AutoCAD, and STEP formats. That means teams can design with confidence before a single profile is cut.
Whether the project is a display frame, a production line workstation, or a full safety guarding system, the right aluminium t-slot extrusion series makes the build faster, stronger, and easier to adjust down the track.