Three 6xxx alloys, all machinable and anodisable. Where 6061, 6082 and 6063 actually differ: strength, behaviour in the cut, anodised appearance, and what you can buy as extrusion.
304 or 316 stainless steel? The mechanical properties are nearly identical — the choice comes down to chloride exposure. A practical comparison for CNC machined parts, with an application selection table.
6061-T6 is the right default for most CNC parts — it machines faster, welds, anodizes cleanly and costs less. 7075-T6 is worth its 30-50% premium only when a part is genuinely strength-critical. Side-by-side data, application table and FAQ.
