Custom CNC Precision Turning 6061-T6 Aluminum Parts – Bright Black Anodizing Surface

These are precision CNC turned aluminum alloy parts made from 6061-T6 aluminum magnesium silicon alloy, finished with bright black anodizing achieving a surface roughness of Ra0.8μm–Ra1.6μm. The combination of tight ±0.01mm dimensional tolerances, a sleek black oxide finish, and the inherent advantages of 6061-T6 makes these parts a preferred choice for engineers and procurement managers in the consumer electronics, automotive, and robotics industries.

Material Advantages 6061-T6 Aluminum Magnesium Silicon Alloy

6061 is the most versatile aluminum alloy in precision manufacturing, and the T6 temper delivers peak mechanical properties.

Structural Integrity:Yield strength of 275 MPa and tensile strength of 310 MPa provide the strength-to-weight ratio critical for structural components in portable devices and vehicle assemblies.

Excellent Machinability: The balanced magnesium and silicon content produces clean chips during CNC turning, minimizing tool wear and enabling faster cycle times without sacrificing surface quality.

Natural Corrosion Resistance: A stable oxide layer forms spontaneously on the aluminum surface, giving 6061 inherent protection against atmospheric corrosion before any surface treatment is applied.

High Anodizing Response: The Mg2Si phase in 6061 reacts uniformly during electrolytic anodizing, producing a dense, pore-free oxide layer that takes dye evenly. This results in a rich, uniform black finish preferred by buyers for visible product components.

Lightweight: At 2.7 g/cm³ density, these parts are approximately 64% lighter than steel, a decisive factor for applications where weight reduction is critical.

Recyclability: 6061 aluminum is 100% recyclable with no quality degradation, supporting buyers' ESG commitments and sustainable sourcing goals.

CNC Turning Process

CNC turning spins the aluminum billet while a stationary cutting tool moves along multiple axes. This process excels at producing cylindrical, conical, and complex internal/external geometries with remarkable repeatability. For 6061-T6 aluminum, optimal cutting parameters-typically 1000–3000 RPM with appropriate depth of cut and feed rate-produce parts that meet ±0.01mm tolerance consistently across large production runs. The process is ideal for shafts, housings, threaded components, and any rotationally symmetric parts where surface finish and dimensional precision are non-negotiable.

Surface Treatment: Bright Black Anodizing (Ra0.8μm–Ra1.6μm)

Anodizing is an electrolytic process that grows a controlled aluminum oxide layer on the part's surface.

The bright black anodizing applied here delivers two key outcomes:

Uniform Deep Black Color:Anodized parts are immersed in an electrolyte bath and subjected to controlled electrical current, forming an aluminum oxide layer. Black dye is absorbed into the porous oxide structure and sealed, producing a uniform, deep black surface that does not chip, flake, or peel over the part's lifetime.

Surface Roughness Control:This range represents a semi-bright to bright machined finish. It is smooth enough to provide comfortable tactile feel for handheld device components and consumer products, yet retains enough micro-texture to improve paint and adhesive bonding, and to hide minor handling marks in industrial applications.

Additional Benefits:
Corrosion resistance is significantly enhanced after anodizing, adding a protective barrier against moisture, salts, and chemicals. The sealed oxide layer also increases surface hardness to approximately 60–70 HRC equivalent, extending wear life in sliding or contact surface applications.

Why These Parts Stand Out

✅ 6061-T6 aluminum magnesium silicon alloy – maximum strength, machinability, and anodizing response in one material
✅ Ra0.8μm–Ra1.6μm bright black anodizing – premium black finish for visible product surfaces
✅ ±0.01mm achievable tolerance – meets the most demanding precision requirements
✅ MOQ 1 piece – no barriers for prototyping, samples, or small-batch orders
✅ 5–25 days production delivery – flexible lead time to match project timelines

Send your 2D drawings (PDF/DXF) or 3D models (STEP/IGES), and receive a detailed quotation including unit price, tooling cost, and delivery timeline within 24 hours. Custom branding and neutral packaging available for bulk orders.

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