Choosing between 30×30, 45×45 and 90×90 T-slot aluminium profiles is about matching the profile to the job: load, span, accessories, budget, and lead times. This guide gives a practical, non-theoretical way to select the right section for your frame, workstation, guard, or fixture. If you want an explanation of T-Slot Aluminium, click the link.
Quick comparison at a glance
- 30×30: Compact, light, ideal for small frames, guards, panels, light fixtures and DIY. Short spans and modest loads. Great where every kilogram and rand count.
- 45×45: The all-rounder. Strong enough for workstations, benches, carts, machine frames with medium spans and frequent reconfiguration.
- 90×90: For heavy, static structures and long spans: test rigs, gantries, machine bases, pallet stations, and applications where deflection control matters.
Rule of thumb: if the structure will be pushed, stood on, or hold moving machinery, start evaluating at 45×45. If spans grow long or forces are high, consider 90×90.
The five-factor selection framework of T-Slot aluminium
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Load & deflection
Think in use-cases, not abstract numbers. Light guarding, instrument panels, and display frames suit 30×30. Benches, carts and process stations typically land on 45×45. Heavy fixtures, mezzanine interfaces or long unsupported runs often require 90×90.
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Span & support frequency
Short spans with multiple uprights favour smaller profiles. If you want fewer legs and clear under-bench space, step up a size (45×45 or 90×90) to control deflection.
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Joints, accessories & add-ons
Heavier accessories (drawers, tool boards, conveyors, vises) add torque at joints. Larger profiles provide more fastening edge distance and stiffer corners, keeping squareness under load.
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Environment & durability
All three sizes resist corrosion well, but consider abrasion, chemical exposure, and cleaning. Profile covers protect slots; stainless fixings and sealed feet suit wash-down or dusty environments.
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Budget & growth
30×30 is the least costly per metre, but labour and rework can outweigh savings if the frame flexes. If you’ll expand later, standardise on 45×45 so add-ons remain compatible.
Typical applications of T-Slot aluminium profiles (with examples)
- 30×30: Light machine guarding, sensor frames, panel enclosures, label stands, small carts, makerspace projects.
- 45×45: Packing benches, fixed workstations, manifest stations, computer carts, safety fences, medium machine frames.
- 90×90: Heavy equipment stands, vibration-sensitive test rigs, long bay racking interfaces, portal frames, fixtures that carry substantial point loads.
Design tips that save time (and cost)
- Keep spans honest: If you’re stretching beyond 1–1.2 m with load on 30×30, plan extra supports or move to 45×45.
- Use diagonals or gussets: A small gusset on 30×30 can outperform a plain corner on 45×45 in resisting racking.
- Plan fastening density: Heavier profiles accept more fasteners per joint and tolerate rework better.
- Think maintenance: Leave access to slot faces for future brackets, sensors, and cable management.
When in doubt, prototype fast
One beauty of T-slot is low-risk prototyping. Mock up a bay with mixed sizes (e.g., 90×90 uprights with 45×45 cross-members) to validate stiffness before committing.
Need help sizing a frame? Siyamuva can model deflection, cut to length, and assemble in our workshop or on site. Ask for a like-for-like option set (30×30, 45×45, 90×90) so you can compare cost, stiffness and future expandability.