Verified Partner Network

Precision CNC Machining Services

From rapid prototyping to full production runs, VNcontx’s Verified Partner Network delivers tight-tolerance parts in aluminum, stainless steel, titanium, and engineering plastics — held to GD&T standards with Cpk/Ppk-verified outputs. Technical quoting by Strategic Quality Governors. Lead time from 5 business days, no minimum order quantity. The Zero-Defect Protocol applies. No deviation. No exception.

5–10 Days Delivery
Expert Technical Quoting
±0.005mm Tolerance
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VNcontx CNC Machining — Precision Field Inspectors at work
CNC Machining · Direct Field Oversight

Why VNcontx
for CNC Machining

Founder-led inspection at District 7 & District 11 production nodes. Zero deviation from spec.

Delivered in as Fast as 1 Business Day
for FAI Samples & Stocked Profiles

  • DFM Synthesis — Technical feedback from 10+ year field operators to optimize geometry & cost.
  • Large-format parts up to 10 metres — bar, beam & structural profiles.
  • No Minimum Order Quantity — 1 FAI sample to 2,400-unit runs.
  • Tight tolerances ±0.005 mm — CMM-verified with Zeiss/Mitutoyo equipment & live Cpk/Ppk data feed.
  • Wide range of engineering steel, aluminium alloys & engineering plastics.
  • Surface finishing: Anodize, Hard Chrome, ENP, Chem Film, Laser Marking.
  • Specialized Steel Bar Joints — custom threaded coupling, undercuts & high-strength export profiles.
  • GD&T-compliant inspection — Zero-Defect Protocol monitored at District 7 & 11 Nodes. No deviation. No exception.
CMM Field Scan · Unit #VNC-0471 LIVE INSPECTION
L = 240.000 mm ± 0.005 Ø28.000 SURFACE Ra 0.4μm ✓ BORE Cpk 1.67 ✓ THREAD M12×1.75 VNC-CMM-3.1
±0.005mm Tolerance
1.67Cpk Index
24/7Founder On-site
0Defects Passed
[CMM] Zeiss Contura scan initiated — Unit #VNC-0471
[DIM] Bore Ø28.000 → 28.003 mm — PASS (Cpk 1.67)
[GD&T] Parallelism 0.003 mm — within GD&T spec ✓
[SURF] Ra 0.4 μm — monitor next batch (amber flag)
[QMS] Zero-Defect Protocol — lot CLEARED for shipment
✓ Strict Quality Control
✓ High-Precision Materials
✓ No MOQ — Prototype Friendly
✓ Export-Standard Packaging
✓ Direct Communication
Services
Our CNC Machining Services
X Z Y AXIS X+117.4 Y+038.2 Z-005.0 SPINDLE 8500 RPM FEED 450 mm/m RUN
Multi-Axis
CNC Milling
3, 4 and 5-axis milling for simple and complex part geometries with GD&T tolerance control to ±0.005mm.
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SPINDLE 2400 RPM FEED 0.15 mm/r DIAMETER Ø 24.995 TOL ±0.005mm RUN
Live Tooling
CNC Turning
Standard and live tooling for cylindrical parts including pins, shafts, bushings, and spacers with Cpk/Ppk verification.
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MODE MANUAL PASS 0.05mm Manual Lathe MAN
Prototype
Manual Machining
Skilled manual lathe and mill operations for prototypes, repairs, and low-volume custom parts. No deviation. No exception.
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Ra 0.8μm — Mirror Polish ANODIZE HARD CT ALODINE POWDER PAINT SURFACE Ra 0.8μm GLOSS 92 GU PASS
Surface
Surface Finishing
Anodizing, polishing, bead blasting, powder coating, and more. Zero-Defect Protocol applied to every aesthetic and functional requirement.
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FINAL ASSY STAGE 3 / 3 QTY 248 PCS OK
Integration
Assembly Services
Sub-assembly and full product assembly with hardware insertion, fastening, and functional testing. Supply Chain Protection 24/7.
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100.000 mm CMM Inspection & First Article PROBE RENISHAW POINTS 142 / 142 PASS
Zero-Defect
Quality Inspection
CMM inspection, first article reporting, and dimensional verification via PDCA. Every part meets spec. No deviation. No exception.
Learn more ›
REQUEST TECHNICAL QUOTE
ENGINEERING MATERIALS LIBRARY
VNCONTX · Export-Grade Quality · Material Traceability (CO/CQ)
VNCONTX CNC Material Datasheet
Sourcing from Verified Partners · ISO 9001:2015 Compliant QMS
METALS — ALUMINIUM & STEEL
MATERIAL COMMON GRADES LEAD TIME FINISHING OPTIONS
Aluminium 6061-T67075-T65052 5–7 Days Anodizing (Type II/III), Sandblasting, Polishing
Steel / Stainless 1045S45CSS304SS316 7–10 Days Passivation, Electropolishing, Plating, Black Oxide
Tool Steel SKD11 (D2)SKD61 (H13) 7–12 Days Hardening, Black Oxide, Grinding
HIGH-PERFORMANCE PLASTICS
MATERIAL KEY PROPERTIES LEAD TIME COMMON USES
Delrin (POM) Low friction, high stiffness 5–7 Days Gears, bushings, precision rollers
PEEK Chemical & heat resistance 7–10 Days Medical, oil & gas, high-temp parts
Polycarbonate Impact resistance, optically clear 5–7 Days Guards, housings, transparent covers
Nylon (PA6/PA66) Wear resistance, lightweight 5–7 Days Structural brackets, wear pads
MANUFACTURING TOLERANCES (REAL-WORLD)
DIMENSION METALS (CNC) PLASTICS (CNC) STANDARD
Linear±0.005 mm±0.01 mmISO 2768-m / GD&T
Angular±0.1°±0.2°ISO 2768-m
Surface RoughnessRa 0.8–3.2 µmRa 1.6–3.2 µmISO 1302
Cpk / Ppk Target≥ 1.67 — Zero-Defect ProtocolAIAG SPC
SURFACE FINISHING SPECS
PROCESS MATERIAL THICKNESS STANDARD
Hard Anodize (Type III)Aluminium25–50 µmMIL-A-8625F
Electroless NickelSteel, Aluminium5–25 µmASTM B733
PassivationStainless Steel—ASTM A967 / AMS 2700
Black OxideSteel, Tool Steel1–2 µmMIL-DTL-13924
CNC COSMETIC STANDARDS
VNCONTX · Visual Inspection Protocol · Zero-Defect Protocol
CNC Cosmetic Inspection Datasheet
Precision Field Inspectors · VNCONTX Visual QC Standard v2.1
SURFACE GRADE CLASSIFICATION
GRADE DESCRIPTION TYPICAL APPLICATION INSPECTION METHOD
A — Premium No visible marks, scratches, or tool paths. Mirror or brushed uniform finish. Exposed consumer surfaces, medical housings, optical mounts 100% visual + Ra measurement
B — Standard Minor uniform tool marks allowed. No deep scratches, burrs, or pitting. Structural enclosures, industrial fixtures, semi-exposed faces Sampling AQL 1.0
C — Functional Tool marks accepted. No burrs or sharp edges. Cosmetics secondary. Internal brackets, hidden structural parts, prototype iteration Dimensional check only
DEFECT ACCEPTANCE CRITERIA
DEFECT TYPE GRADE A GRADE B GRADE C MEASUREMENT
Scratch / Score REJECT < 5mm, 1 max Accepted Visual, 10× loupe
Tool Mark / Witness REJECT Uniform only Accepted Raking light inspection
Burr / Sharp Edge REJECT REJECT REJECT Touch test + radius gauge
Pitting / Porosity REJECT REJECT < 0.3mm dia. 10× loupe, profilometer
Dent / Ding REJECT REJECT < 0.1mm depth Depth gauge
Discolouration REJECT Non-exposed only Accepted Visual, Pantone match
Machining Chatter REJECT Ra < 1.6 µm Accepted Profilometer
SURFACE ROUGHNESS TARGETS
FINISH PROCESS Ra TARGET Rz MAX STANDARD
As-MachinedRa 1.6–3.2 µmRz 12.5 µmISO 1302 N7–N8
Fine MachinedRa 0.8–1.6 µmRz 6.3 µmISO 1302 N6
Brushed / Bead BlastRa 0.4–1.6 µmRz 4.0 µmVNCONTX-VQ-02
Hard Anodize (Type III)Ra ≤ 0.8 µmRz 3.2 µmMIL-A-8625F
Polished / MirrorRa ≤ 0.2 µmRz 0.8 µmISO 1302 N4
COSMETIC INSPECTION CHECKLIST
NO. CHECKPOINT TOOL ACCEPT CONDITION
01All sharp edges deburredTouch testNo detectible edge ≥ 0.05mm
02Surface finish uniformRaking lightPer grade spec above
03Ra confirmedProfilometerPer finish process target
04No coolant stainVisualGrade A/B: zero
05Anodize uniform colourPantone / visualΔE < 2.0
06Threads cleanGo/No-Go gaugeFull pass both gauges
07Part ID legibleVisualCO/CQ traceability confirmed
VNcontx · CNC Machining

MATERIALS WE MACHINE

Select a material to view specifications, tolerances & available finishes.

Non-Ferrous Metal 6061-T6 · 7075-T6

Aluminum

The most commonly machined metal — excellent strength-to-weight ratio, outstanding machinability, and a wide range of finishes. 6061-T6 is the go-to for general structural parts and enclosures; 7075-T6 approaches medium-carbon steel strength for high-load aerospace and performance applications. Both alloys machine fast with superior surface quality under VNcontx’s Zero-Defect Protocol.

3–5Days Lead Time
Cpk ≥1.67Process Capability
Ra 0.4µmSurface Finish
Anodize Type IIAnodize Type III (Hard)Chromate ConversionBead BlastPowder CoatAs-Machined
Aluminum CNC Part
Ferrous Metal 303 · 304 · 316L · 17-4 PH

Stainless Steel

Outstanding corrosion resistance with high strength and a premium aesthetic finish. 303 is optimized for machined fittings and fasteners; 316L excels in marine and medical environments; 17-4 PH offers precipitation-hardened performance for aerospace and defense. All grades processed under VNcontx’s Zero-Defect Protocol with CMM first-article inspection.

5–7Days Lead Time
Cpk ≥1.67Process Capability
Ra 0.8µmSurface Finish
ElectropolishPassivationBead BlastVibratory PolishAs-Machined
Stainless Steel CNC Part
Ferrous Metal 1018 · 4140 · 4340 · A36

Steel

The workhorse of precision machining — exceptional strength, weldability, and heat-treat response across a broad alloy spectrum. 1018 provides excellent machinability for structural components; 4140 and 4340 deliver high-performance chromoly for shafts, gears, and tooling; A36 is the standard for structural fabrication. Supply Chain Protection 24/7 ensures consistent material traceability.

5–8Days Lead Time
Cpk ≥1.67Process Capability
Ra 1.6µmSurface Finish
Black OxideZinc PlatePowder CoatE-coatAs-Machined
Steel CNC Part
Non-Ferrous Metal C360 · C260 · C464

Brass

Free-machining brass offers the fastest chip formation of any metal, making it ideal for high-volume precision components like fittings, valves, and electrical connectors. C360 is the benchmark for machinability; C260 cartridge brass provides excellent cold-working capability; C464 naval brass delivers marine-grade corrosion resistance. Premium surface aesthetics standard.

3–5Days Lead Time
Cpk ≥1.67Process Capability
Ra 0.4µmSurface Finish
As-MachinedElectroplate (Nickel)Gold PlateChrome PlateLacquer
Brass CNC Part
Engineering Plastic Homopolymer · Copolymer · Glass-Filled

Delrin (POM)

Acetal resin delivers the best combination of stiffness, low friction, and dimensional stability of any unreinforced thermoplastic. Ideal for gears, bearings, bushings, and precision sliders where metal would be overbuilt. Machines cleanly with tight tolerances and exceptional surface finish. Glass-filled grades extend load capacity for demanding structural applications.

3–5Days Lead Time
Cpk ≥1.33Process Capability
Ra 0.8µmSurface Finish
As-MachinedBead BlastPainting
Delrin CNC Part
High-Performance Plastic Unfilled · 30% GF · Carbon-Filled

PEEK

Polyether ether ketone is the premier high-performance polymer — continuous use to 250°C, inherent chemical resistance, and mechanical properties approaching aluminum at a fraction of the weight. The material of choice for aerospace brackets, medical implant components, and semiconductor tooling where zero compromise is the standard. No deviation. No exception.

5–8Days Lead Time
Cpk ≥1.33Process Capability
Ra 0.8µmSurface Finish
As-MachinedPolishedLaser Marking
PEEK CNC Part
Non-Ferrous Metal Grade 2 · Grade 5 (Ti-6Al-4V) · Grade 23

Titanium

The pinnacle of strength-to-weight engineering — titanium combines the tensile strength of steel at 40% less weight with exceptional biocompatibility and corrosion resistance. Ti-6Al-4V (Grade 5) is the industry standard for aerospace structures and orthopedic implants. Grade 23 (ELI) meets ISO 5832-3 for implantable medical devices. Precision Field Inspectors verify every critical feature.

7–10Days Lead Time
Cpk ≥1.67Process Capability
Ra 0.4µmSurface Finish
Anodize Type II (Color)PassivationElectropolishBead BlastAs-Machined
Titanium CNC Part
Engineering Plastic ABS · Polycarbonate · ABS-PC Blend

ABS / PC

ABS offers excellent impact resistance and ease of machining, making it ideal for housings, enclosures, and functional prototypes requiring painted or bonded assemblies. Polycarbonate provides optical clarity and near-unbreakable impact toughness for lenses, guards, and display components. The ABS-PC blend merges both: high-temperature resistance with outstanding ductility for demanding functional parts.

3–5Days Lead Time
Cpk ≥1.33Process Capability
Ra 0.8µmSurface Finish
As-MachinedPaintingBead BlastVapor Polish (PC)Laser Marking
ABS / PC CNC Part

Frequently Asked Questions

Everything you need to know about VNcontX’s precision machining process.

Typical lead time for CNC orders?

Standard: 7–12 business days from drawing confirmation. Expedited 5–7 days available upon request, subject to capacity. Rapid CNC prototyping (FAI samples) ships in 3–5 days. No deviation. No exception.

What tolerances can you achieve?

Standard GD&T: ±0.005mm. Precision: ±0.003mm with Cpk ≥ 1.67 validation — achievable on 5-axis CNC and wire EDM. Surface finish Ra 0.8μm standard, Ra 0.4μm fine. All parts CMM-inspected (Zeiss Contura + Mitutoyo) before shipment.

What materials are supported?

Aluminum (6061-T6 / 7075-T6), Stainless Steel (303 / 304 / 316L / 17-4 PH), Carbon & Tool Steel, Titanium (Grade 2 / Grade 5), Brass (C360), and engineering plastics (POM / PEEK / PC / ABS). Additional alloys available on request.

What CNC processes do you offer beyond 3-axis milling?

3-axis and 4-axis CNC milling, 5-axis simultaneous machining (DMG Mori), CNC turning (Mazak QT), mill-turn, and wire EDM for hardened tool steel up to 62 HRC. All under one ISO 9001:2015 certified facility.

How is design confidentiality protected?

NDA signed before any file transfer. All drawings and design files treated as strictly confidential under Zero-Defect Protocol. No deviation.

Can you handle rush orders?

Expedited lead time (5–7 business days) available subject to capacity. For prototype and first-article work, see rapid CNC prototyping Vietnam — FAI samples in 3–5 days. Confirm availability before ordering.

Complex geometries or 2D drawings?

Both fully supported. Complex 3D contours and undercuts are handled on 5-axis CNC. STEP, IGES, DXF, CATIA V5, SolidWorks, and Parasolid accepted. 2D PDF prints with tolerance callouts are sufficient for turning and milling work.

Do you offer DFM feedback?

Yes — complimentary DFM review on every order before production commitment. Common flags: wall thickness, internal radii vs tool diameter, turning vs milling process selection, and finish stock allowance for heat-treat parts.

What quality standards apply?

ISO 9001:2015 certified. 100% CMM inspection + FAI report on every order. Cpk ≥ 1.67 process target. For flight-critical parts, see our aerospace CNC machining guide — GD&T verification, FAI documentation, AS9100-aware workflow.

Do you serve US companies specifically?

Yes. Vietnam is Section 301 tariff-free — 0% vs 25–145% on Chinese goods — making landed cost 30–40% lower. Air freight to US West Coast 2–3 days. See our dedicated page: CNC machining Vietnam for US companies.