Definition of Aluminum 6061-T6 | 3.3211| 65028| AlMg1SiCu
Aluminum 6061-T6 | 3.3211 | 65028 | AlMg1SiCu is a strong, lightweight aluminum alloy containing magnesium, silicon, and a small amount of copper. The T6 condition means the material has been heat-treated to improve its strength. It offers good corrosion resistance, machinability, and weldability. Because of its balanced properties, Aluminum 6061-T6 is widely used for CNC-machined parts, automotive components, frames, brackets, fittings, marine parts, and general industrial products.
Properties of Aluminum 6061-T6 | 3.3211| 65028| AlMg1SiCu
| Property | Value |
|---|---|
| Mechanical Properties | |
| Ultimate tensile strength | 260 – 310 MPa |
| Yield strength | 240 – 270 MPa |
| Young’s modulus (modulus of elasticity) | 68 – 74 GPa |
| Elongation at break | 8 – 11 % |
| Physical Properties | |
| Corrosion resistance | High |
| Magnetism | Non-magnetic |
| Weldability | High |
| Thermal Properties | |
| Maximum service temperature | 130 – 150 °C |
| Thermal expansion coefficient | 22.7 – 23.9 × 10-6/ºC |
| Thermal conductivity | 152 – 169 W/(m⋅°C) |
| Electrical Properties | |
| Electrical resistivity | 3.9 – 4.1 μΩ*cm |
| Post Treatments | |
| Post-Processing | Annealing & Cold working |
| Anodizing compatibility | Suitable |
| Common Applications | |
| Automotive industry | Marine industry |
| Electrical fittings | Couplings & valves |
Why Aluminum 6061-T6 | 3.3211| 65028| AlMg1SiCu Matters in CNC Workshops
- Good machinability: Aluminum 6061-T6 is easy to mill, turn, drill, and cut with CNC machines, making it suitable for many precision parts.
- Good strength: The T6 heat treatment gives the alloy useful strength for structural and mechanical components.
- Good corrosion resistance: It performs well in many outdoor, industrial, and marine environments and requires less protection than some high-strength aluminum grades.
- Easy to finish and weld: Aluminum 6061-T6 works well with anodizing, coating, and many welding processes, giving workshops more manufacturing options.
Surface Finishes Aluminum 6061-T6 | 3.3211| 65028| AlMg1SiCu
As-Machined
The default finish from CNC machining plastic stock (Delrin, nylon, HDPE, ABS). Visible linear tool path scallop marks across machined surfaces with a matte plastic sheen. No secondary operation suitable for functional components, jigs, fixtures, and internal parts where cosmetic appearance is secondary to dimensional accuracy.
Flame Polished
Quick post-fabrication process that passes a controlled flame over acrylic (PMMA) cut edges, melting the surface micro-layer to produce a crystal-clear, glossy, transparent edge. Fast and cost-effective for acrylic sheet edges produces optical clarity on cut borders without the labor of hand polishing. Ideal for display cases, signage, and acrylic enclosures.
Vapor Polished
Post-fabrication chemical process that exposes transparent plastic parts (acrylic, PC, PETG) to solvent vapor, melting and smoothing the surface micro-layer to dramatically improve optical clarity and gloss. Removes machining lines and produces crystal-clear transparent parts — essential for prototype lenses, light guides, display windows, fluidic chambers, and medical components requiring optical transparency.
Painted
Post-fabrication spray painting in any custom color (matte, satin, gloss, metallic) followed by screen printing or pad printing for logos, labels, buttons, and graphics. Applied over a primed plastic surface for uniform color and adhesion. Allows custom fabricated plastic parts to match production aesthetics widely used for control panels, instrument faces, enclosures, and marketing/showcase components requiring exact brand color and graphic printing.
Sanded
Post-fabrication sanding with progressively finer grit sandpaper (typically 240–600 grit) produces a uniform low-gloss matte non-reflective surface. Hides machining marks, scratches, and surface inconsistencies while providing a soft tactile feel. Used for HDPE, UHMW, and nylon components where a durable, non-glare, fingerprint-resistant matte appearance is desired for industrial and functional parts.
Heat Formed
Thermoforming process that heats plastic sheet (acrylic, polycarbonate, ABS) to its glass transition temperature and bends it over a form tool to create precise angles and curved shapes. Produces clean, smooth bend radii with consistent surface finish no tool marks at the bend. Used for display stands, guards, enclosures, signage, and custom fabricated parts requiring 3D formed shapes from flat sheet stock.
