6063-T6 is generally preferred for CNC machining because it offers higher strength and better dimensional stability than softer tempers like T4 or T5. XC Machining can work with any temper, but T6 provides the best balance between machinability and final performance. 

Yes. 6063 has excellent natural corrosion resistance and is widely used outdoors for window frames, door systems, railings, and architectural structures. Anodizing further enhances its resistance to weather, moisture, and UV exposure, making it ideal for long-term outdoor use. 

Although 6063 is known as an extrusion alloy, it machines very well. It produces smooth chips, low tool wear, and stable dimensional accuracy when machined. XC Machining frequently extruded 6063 profiles to add precision features, pockets, and mounting holes. 

6063 has a balanced magnesium–silicon composition that produces a smoother surface after extrusion and machining. This fine grain structure allows anodizing to develop more evenly, resulting in better color uniformity, higher clarity, and better overall aesthetic quality than 6061. 

Yes, especially in T5 and T6 temper conditions. While it is not as strong as 6061, Aluminum 6063 offers sufficient strength for architectural frames, railings, brackets, and structural profiles. It is widely used in construction, automotive trim, and industrial assemblies where formability and surface finish matter more than maximum strength.