Aluminium Extrusion 180×20 for CNC Machine Frames

The aluminium extrusion 180×20 is a heavy-duty structural profile built for CNC machine frames, router bases and other industrial assemblies that need serious rigidity. Its wide 180mm face paired with a 20mm height gives it strong resistance to bending and torsion, which matters on long spans that carry load or absorb vibration during cutting.

It suits machine builders, workshop owners and technicians who design their own CNC frames or gantries, as well as anyone building industrial fixtures that need a stiff, lightweight base. This aluminium extrusion 180×20 is sold by the millimetre, so you order the exact length your build needs without paying for offcuts or extra cutting charges.

Features of the aluminium extrusion 180×20

This profile is made from aluminium alloy, a material that combines low weight with solid mechanical strength, which is why it’s preferred over steel when the mass of the finished frame matters. The cross-section includes internal ribs that add stiffness without adding unnecessary weight, so the extrusion stays manageable to handle and mount even at long lengths.

Because the aluminium extrusion 180×20 is cut to order by the millimetre, you can plan a frame down to the last joint without stock-length compromises. The flat, wide face also gives you plenty of room for T-nuts, brackets and mounting hardware along the length of the beam.

• Cross-section: 180mm wide x 20mm high
• Material: extruded aluminium alloy
• Internal reinforcing ribs for added stiffness
• Sold by the millimetre for custom lengths
• Flat face suitable for T-nuts and brackets
• Corrosion-resistant surface finish

Where it’s used

The aluminium extrusion 180×20 turns up most often in CNC router gantries, machine bases and moving axis carriages, where a wide flat beam needs to stay flat under repeated load. It’s also used in workshop jigs, conveyor frames and other fixtures where a rigid, lightweight beam replaces a heavier steel section. You can browse more profiles and CNC parts in the CNC parts shop.

Builders working with plywood, MDF or aluminium sheet cutting machines often choose this size for the main gantry beam, since the width keeps the linear rails and ballscrew mounts properly aligned over long travel distances. Smaller CNC and 3D printer frames rarely need a profile this wide, so it’s best reserved for machines with larger working areas.

What to check before buying

Before ordering, confirm the exact length your design needs, since the aluminium extrusion 180×20 is cut and priced by the millimetre and can’t be shortened after the fact. Check that your T-nuts, brackets and end-mounting hardware match the slot dimensions of this specific profile, because slot widths vary between extrusion families and a mismatched size won’t seat properly.

Also plan for the weight and footprint of a 180mm-wide beam in your frame design, particularly if you’re mounting it vertically or joining it to narrower profiles, since the transition may need extra brackets. If you’re unsure which profile fits your gantry span, compare deflection needs against narrower and taller sections before committing to this width.

Installation and maintenance

Mount the aluminium extrusion 180×20 using T-nuts and bolts through the slot channels rather than drilling through the face wherever possible, since this keeps the reinforcing ribs intact and preserves the beam’s stiffness. Use a square or dial indicator when joining lengths at right angles, as any misalignment at this width shows up quickly once linear rails are fitted.

Routine maintenance is minimal: wipe away swarf and dust from the slots, check that mounting bolts stay torqued after heavy use, and inspect for surface scoring near contact points. For background on how these sections are manufactured, see the Wikipedia entry on metal extrusion, which explains the process behind the alloy’s strength-to-weight profile.

FAQ

Is the aluminium extrusion 180×20 sold in fixed lengths? No, it’s sold by the millimetre, so you order the exact length your frame requires.

What alloy is it made from? It’s manufactured from extruded aluminium alloy, chosen for its balance of low weight and mechanical strength.

Can it be joined to narrower profiles? Yes, with corner brackets and T-nuts matched to the slot size, though you should check alignment carefully given the width difference.