80×120 Aluminium Extrusion Profile for CNC Frames

The 80×120 aluminium extrusion is a heavy-duty structural profile built for machine frames that need to resist bending under real load, not just look solid on a drawing. Its asymmetric cross-section — 80mm on one face and 120mm on the other — gives it far more resistance to flex along the long axis than a square profile of similar weight, which is exactly what a CNC gantry upright or a machine base rail needs.

It ships as raw bar stock, sold by the millimetre of length, so builders order the exact run they need for a base frame, a vertical column, or a long bed rail without paying for offcuts. This makes it a natural fit for anyone designing or repairing a CNC router, plasma table, or similar industrial frame from scratch.

Features of the 80×120 Aluminium Extrusion

This profile keeps the strength-to-weight ratio typical of the 80×120 aluminium extrusion while adding the section depth needed for long unsupported spans. The internal channels run the length of the bar, leaving room to route cables, air lines, or coolant tubing inside the frame instead of alongside it.

T-slots along each face accept standard T-nuts, so brackets, motor mounts, and gantry plates bolt on without drilling into the profile itself. That keeps the frame reconfigurable if the machine design changes later.

• Asymmetric 80x120mm cross-section for directional bending resistance
• Sold by the millimetre, cut to the exact length ordered
• Internal channels for cable and hose routing
• T-slots compatible with standard T-nuts and corner brackets
• Works with standard aluminium profile accessories such as corner brackets, sliding nuts, and connectors

Where It’s Used

Builders reach for the 80×120 aluminium extrusion wherever a frame needs to resist bending in one direction more than the other — vertical columns on a CNC router gantry, long horizontal bed rails, or the base frame of a plasma or laser table. The taller 120mm face takes the load path, while the 80mm face keeps the footprint manageable.

It also shows up in workshop-built machinery outside CNC routers: conveyor frames, enclosure structures, and heavy jigs where a square profile would flex more than the design allows. For the full range of profiles, connectors, and other CNC building blocks, see the shop.

What to Check Before Buying

Confirm which face of the profile carries the load in your design before ordering — the 80×120 aluminium extrusion is only stiffer along its long axis, so mounting it the wrong way round gives away the advantage over a square section. Check the T-slot width against the T-nuts and brackets already in use elsewhere in the build, since mixing slot sizes within one frame is a common source of fitting problems.

Because it’s sold by length, measure the finished frame dimension rather than the nominal profile length, and account for the material any corner brackets or end caps will take up. Order a few extra millimetres if the cut will be trimmed square afterward.

Installation and Maintenance

Assembly follows standard aluminium profile practice: corner brackets and T-nuts hold the frame square while it’s built, then structural bolts through drilled faces take the permanent load once the geometry is confirmed. Support the profile at both ends when cutting it to length so the cut stays square and the internal channels don’t deform.

Maintenance is minimal — wipe down the surface periodically and check that fasteners haven’t loosened under vibration from the machine it supports. For background on how aluminium extrusion profiles are manufactured and why the process gives them their strength, see the reference link.

FAQ

Can the 80×120 aluminium extrusion be cut to a custom length? Yes, it’s sold by the millimetre, so you order the exact length your frame needs.

Which direction is the profile stiffest? Along its long axis, the direction where the 120mm face resists bending more than the 80mm face.

Does it accept standard T-slot accessories? Yes, the T-slots take standard T-nuts, corner brackets, and connectors used with aluminium profile systems.