Superior Quality CNC Machined 6061‑T6 Aluminum Components Aerospace‑Grade Anodized Finishes Backed by Full Material Traceability
CNC machining delivers consistent precision across production runs. Standard dimensional tolerances hold ±0.005 in (±0.127 mm), while precision machining achieves ±0.0005 in (±0.0127 mm). Process repeatability is rated at ±0.001 in (0.0254 mm) for CNC turning centers. Typical lead times range from 1–2 weeks for prototypes to 4–6 weeks for production volumes. Surface finish as-machined averages Ra 3.2 µm (125 µin), with grinding or fine finishing achieving Ra 0.8 µm (32 µin).
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Product Details
What is CNC Machined?
CNC machined is a subtractive manufacturing process that uses pre-programmed software to control cutting tools with high precision. It encompasses milling, turning, drilling, and grinding operations—typically on 3‑axis to 5‑axis equipment—to produce metal components with tight geometric tolerances and exceptional repeatability, eliminating the need for secondary fixturing in most applications.
Material Composition of CNC Machined:
| Material | Key Properties | Typical Application |
| Aluminum 6061-T6 | Tensile strength 310 MPa (45 ksi); excellent machinability | Aerospace brackets, electronic housings |
| Aluminum 7075-T6 | Tensile strength 570 MPa (83 ksi); high strength-to-weight ratio | Structural components, high-stress parts |
| Stainless Steel 303/316 | 303: free-machining; 316: superior corrosion resistance | Medical devices, marine hardware |
| Stainless Steel 17-4 PH | Hardness 40–45 HRC after precipitation hardening | Aerospace fittings, pump shafts |
| Alloy Steel 4140 | Heat treatable to 32–36 HRC; high strength | Hydraulic manifolds, gears |
Surface Treatment of CNC Machined:
| Finish | Specifications | Performance |
| Anodizing Type III (Hard Coat) | Thickness 25–50 µm; hardness 60–70 HRC | Wear and corrosion resistance; meets MIL-A-8625 |
| Electroless Nickel Plating | Thickness 10–25 µm; hardness 45–55 HRC (as-plated) | Uniform coverage; corrosion protection per ASTM B733 |
| Passivation | Meets ASTM A967; removes free iron | Restores corrosion resistance for stainless steel |
| Black Oxide | Thickness 0.5–1.5 µm; meets MIL-DTL-13924 | Temporary corrosion protection with oil coating |
Specifications of CNC Machined:
CNC machined components must conform to established industry standards to ensure interchangeability and quality verification:
- Geometric Dimensioning and Tolerancing (GD&T): Compliance with ASME Y14.5‑2018 is the baseline for defining form, orientation, profile, and runout tolerances. True position tolerances are typically specified at Ø0.010 in (0.25 mm) for critical mounting features, with tighter control at Ø0.005 in (0.13 mm) for precision interfaces.
- Thread Standards: External and internal threads conform to ASME B1.1 for Unified National Coarse (UNC) and Fine (UNF) series. Metric threads follow ISO 68‑1 for basic profile, with tolerance classes such as 6H for internal metric threads and 6g for external. Thread engagement lengths are typically specified as 1.5 × nominal diameter for standard applications.
- Surface Finish Measurement: Surface roughness is specified in Ra (arithmetical mean roughness) per ASME B46.1. Standard machined surfaces measure Ra 3.2 µm (125 µin) . Ground and lapped surfaces for bearing journals or sealing applications require Ra 0.8 µm (32 µin) or finer, with some precision applications calling for Ra 0.4 µm (16 µin) .
- Inspection and Quality Assurance: First Article Inspection (FAI) per AS9102 is mandatory for aerospace components, documenting all critical dimensions and material certifications. For general industrial applications, a Certificate of Conformance (CoC) with material traceability to mill test reports (MTRs) is standard. Dimensional inspection reports typically include Cpk (Process Capability Index) values of 1.33 or higher for critical characteristics, indicating a capable process with minimal defect risk.
- Material Certification: Aerospace components require AMS (Aerospace Material Specifications) compliance with full traceability to heat or lot numbers. Medical components require ISO 13485 certified manufacturing environments and biocompatible materials meeting ISO 10993 standards.
Application for CNC Machined:
- Aerospace: Structural brackets, hydraulic fittings, engine mounts — requires AS9100D certification
- Medical: Surgical instruments, orthopedic implants — typically 316L stainless steel or Ti‑6Al‑4V
- Industrial Automation: Robotic arm components, pneumatic manifolds — high repeatability essential
- Oil & Gas: Valve bodies, downhole tools — materials rated for pressures up to 15,000 psi
- Semiconductor: Chamber components, wafer handling parts — surface finish Ra ≤ 0.4 µm to prevent contamination
Polestar Excellent Case about CNC Machined:
Solution: A monolithic manifold was CNC machined from 4140 alloy steel, heat‑treated to 32–36 HRC. A 5-axis CNC machining center eliminated weld joints entirely. Internal fluid channels were gun-drilled with intersections deburred via abrasive flow machining (AFM). All ports were machined to SAE J514 O‑ring boss (ORB) standards with positional tolerances of ±0.005 in.
Results: Field failure rate dropped from 12% to less than 0.5% , eliminating weld‑related leaks. Assembly time reduced by 25% , saving 0.6 hours per unit. Monolithic design reduced overall assembly weight by 15%. Achieved ISO 1219‑1 compliance, enabling a multi‑year supply contract with a major agricultural OEM.
Why Partner with Us?
In an industry where cost control and quality stability determine success, we deliver both—with data to prove it.
By eliminating mold fees for aluminum profiles and waiving welding fixture charges, we save clients 12–18% in upfront tooling costs compared to conventional suppliers. Our hybrid manufacturing model integrates aluminum extrusion, shaped metal, casting, and MIM with in-house CNC machined, achieving 15–25% lower unit prices through optimized material utilization and reduced outsourcing overhead.
Our lean manufacturing systems consistently yield 99.3% on-time delivery and <1.2% defect rates, validated by our ISO 9001 and IATF 16949 certifications. With laser cutting, bending, stamping, CNC machining, sheet metal fabrication, welding, and assembly all under one roof, we eliminate cross-supplier coordination risks—ensuring your quality control remains singular, stable, and fully traceable.
We don’t just claim efficiency. We prove it in every batch. Join us, and manufacture with certainty.
