Custom CNC Machined Parts — Precision Components for OEM Buyers
Quick Answer
Emitech manufactures custom CNC machined parts and OEM components in quantities from one-off prototypes to larger production runs. Our ISO 9001:2015 facility in Nanjing, China machines aluminum, stainless steel, carbon and alloy steel, brass, titanium, and engineering plastics on a range of CNC machines including lathes and 3-, 4-, and 5-axis machining centers. Standard tolerance is ±0.05 mm, with critical features held to ±0.01 mm and verified by CMM. DFM feedback is provided within one business day, with material certification and full dimensional reporting available on request.
Send your drawing to get a custom CNC machined parts quote with DFM review and competitive pricing within one business day. Browse our precision machining services, CNC prototyping page for rapid turnaround, and CNC turned parts for rotational components.
How Custom CNC Works at Emitech
Custom CNC machining turns your drawing into finished parts through a controlled workflow that eliminates surprises and keeps delivery predictable. Emitech's full CNC machining capabilities cover milling, turning, and 5-axis work, with CNC turning services for shafts, pins, and threaded components.
- Upload drawing: Send STEP, IGES, PDF, or native SolidWorks files with material, quantity, tolerance, and surface finish requirements.
- DFM review: Our engineers check every feature for manufacturability and propose changes that reduce cost or improve quality without affecting function.
- Quote within one business day: Detailed pricing includes unit cost, tooling, material, lead time, and recommended finishing.
- CAM programming and first article: Toolpaths are generated, simulated, and run on the first part for customer approval.
- Production machining and inspection: Parts are machined with documented process controls and measured against the drawing.
- Finishing, packaging, and shipping: Surface treatments are applied, parts are protected for transit, and lots ship with inspection reports.
Materials for Custom CNC Parts
| Material | Common Grades | Typical Application | Stock Availability |
|---|---|---|---|
| Aluminum | 6061-T6, 6063, 7075, 2024 | Housings, brackets, heat sinks, aerospace components | In stock |
| Stainless steel | 303, 304, 316L, 17-4 PH | Medical instruments, marine hardware, food equipment | In stock |
| Carbon and alloy steel | 12L14, 4140, 4340, 1045 | Shafts, gears, tooling, structural components | In stock |
| Brass | C36000, C46400, C93200 | Connectors, valves, decorative hardware | In stock |
| Titanium | Grade 2, Grade 5 (Ti-6Al-4V) | Implants, aerospace brackets, chemical hardware | Source to order |
| Engineering plastics | POM, PEEK, PTFE, Nylon | Insulators, bushings, low-friction components | In stock |
Part Complexity We Can Handle
- Simple prismatic parts: Blocks, plates, and brackets with holes, slots, and tapped features
- Multi-sided components: Parts machined on 4 sides with precise positional relationships between features
- Complex 5-axis geometries: Impellers, turbine blades, manifolds, and aerospace brackets with compound angles
- Precision turned parts: Shafts, pins, bushings, and threaded fittings with tight concentricity
- Hybrid MIM + CNC parts: Near-net MIM blanks finished with CNC for critical bores, threads, and flats
Custom CNC Parts vs Standard Off-the-Shelf Parts
| Factor | Custom CNC Parts | Standard Parts |
|---|---|---|
| Geometry | Designed exactly for your assembly | Limited to standard catalog shapes |
| Material | Any machinable alloy or plastic | Restricted to stocked grades |
| Tolerance | ±0.01 mm achievable on critical features | Typically ±0.1 mm or looser |
| Quantity flexibility | 1 piece to 10,000+ pieces | Must meet supplier MOQ |
| Cost at low volume | No tooling cost, fast setup | May require minimum order fees |
Quality and Documentation
Every custom CNC parts order is supported by the quality systems and documentation expected by global OEMs.
- CMM dimensional reports: Full 3D measurement with GD&T verification
- Material certifications: Mill test reports with heat and lot traceability
- First-article inspection reports: Available for aerospace and medical programs per customer requirements
- PPAP documentation: Available for automotive customers per program requirements
- SPC data: Process capability studies on critical dimensions
- Certificate of conformance: Standard with every shipment
Frequently Asked Questions
What is the minimum order quantity for custom CNC parts?
Emitech offers flexible order quantities. We produce single-piece prototypes and scale to larger production runs. Unit cost typically decreases as volume increases due to setup amortization.
What is the fastest lead time for custom CNC parts?
Prototypes ship in 3–7 business days. Production lead time is typically 2–4 weeks depending on quantity, material availability, and surface finishing requirements.
How does the quoting process work?
Upload your drawing with material, quantity, tolerance, and finish requirements. Our engineering team reviews the design for manufacturability and returns a detailed quote within one business day.
What materials can Emitech machine for custom CNC parts?
We machine aluminum, stainless steel, carbon and alloy steel, brass, titanium, and engineering plastics. Specialty alloys are available on request.
What tolerance can Emitech hold?
Standard CNC tolerance is ±0.05 mm. Critical features can be held to ±0.01 mm with suitable tooling, fixturing, and inspection.
Do you retain customer drawings or charge mold/tooling fees?
No. Customer drawings and intellectual property remain confidential. Standard CNC does not require dedicated tooling beyond reusable fixtures, which are customer-owned.
Can custom CNC parts include internal threads?
Yes. We cut internal and external threads during turning or milling, and we can add threaded inserts if needed for stronger joints in soft materials.
How do you ensure consistency across production lots?
We use documented work instructions, calibrated tooling, in-process inspection every two hours on critical dimensions, and CMM verification on first articles and periodic samples.
Source Custom MIM Parts from Emitech
Nanjing Emitech (ISO 9001:2015) delivers MIM from tooling through sintering and finishing, plus precision CNC machining for prototypes and secondary operations. Custom MIM parts · CNC machining services · MIM services · Request a quote