Custom CNC Machining Services — Prototype to Production
Richconn delivers precision custom CNC machined parts with tolerances to ±0.005 mm — from single prototypes to large-volume production runs. CNC milling, turning, Swiss machining, and 5-axis all under one ISO-certified roof.
- ISO 9001 · AS9100D · IATF 16949 Certified
- ±0.005 mm Tolerance
- Prototype in 7 Days
- No MOQ · 1-piece OK
Richconn CNC machining capabilities at a glance.
5 Process Families
CNC turning, CNC milling (3/4/5-axis), 5-axis machining, Swiss machining, turn-mill machining — all in-house in Shenzhen.
40+ Grades
Aluminum (6061/7075), stainless (303/304/316/17-4PH), brass, copper, titanium (Gr2/Gr5), tool steel, PEEK, POM, PTFE, Nylon.
±0.001 mm
ISO 2768-m general · ±0.01 mm turning/milling · ±0.001 mm Swiss on CITIZEN / TSUGAMI machines.
Ø 0.5 – Ø 200
Swiss: Ø 0.5-32 mm bar · Milling: 1,200 × 600 × 500 mm envelope · Turning: Ø 200 mm chuck.
1 – 100,000+
Prototypes (1–50) · Low-volume (50–1,000) · Batch production (1,000–100,000+ pcs)
10 Treatments
Anodizing (Type II / III hardcoat), electroplating, passivation, polishing, bead blasting, powder coating, heat treatment.
CMM Verified
CMM, Rational 2D/2.5D optical, RKE CCD automatic sort, Seiko SII XRF, micrometers, height gauges, roughness tester.
CAD Accepted
STEP, STP, IGES, IGS, X_T, DWG, DXF, PDF drawings with GD&T. NDA available on request.
Ready to quote? Upload your CAD files for a quote →
What are custom CNC machining services?
Custom CNC machining services are subtractive manufacturing services where a machine shop produces parts to your specific drawings, CAD files, and material specifications — rather than from a fixed catalogue.
You provide the 3D CAD model (STEP, IGES, or X_T), 2D drawings with tolerances and GD&T, material grade, surface finish requirement, and quantity. The CNC shop programs toolpaths, selects raw stock, machines the parts on CNC turning centers, milling centers, Swiss-type lathes, or turn-mill machines, inspects each lot, and ships finished components to your facility.
Unlike off-the-shelf components, custom CNC machined parts are engineered to fit your assembly, function, and material requirements — whether that means a connector pin held to ±0.005 mm concentricity for a probe card, an aluminum housing milled to mate with a specific PCB stack-up, or a stainless steel shaft heat-treated to a defined hardness.
Bringing a new mechanical design from CAD to first prototype (1 – 10 pieces) for validation testing.
Producing low-volume production runs (50 – 1,000 pcs) where injection molding tooling cost is not justified.
Manufacturing replacement parts for legacy equipment when the original drawing exists but the OEM no longer supplies the part.
Scaling a validated design into ongoing batch production (1,000 – 100,000+ pcs) with traceable material certificates.
Migrating a domestic supplier to a China-based precision CNC partner to reduce unit cost while maintaining ISO-certified quality.
Our custom CNC machining capabilities.
Richconn operates 100+ precision CNC machines across five core process families.
CNC Turning Services
CNC turning rotates the workpiece against a fixed cutting tool to produce cylindrical and rotationally symmetric parts — shafts, pins, bushings, sleeves, threaded components, and fittings. Richconn’s CNC turning capability covers OD turning, ID boring, threading, grooving, knurling, parting, and live-tooling operations (cross-drilling, milling flats, tapping) completed in a single setup on our turning centers.
We hold ±0.01 mm general turning tolerance and ±0.005 mm on critical OD/ID features with in-process gauging. Common turned parts include precision drive shafts (SUS304, SUS316, 17-4PH), brass connector bodies, aluminum bushings (6061-T6), and threaded fittings.
CNC Milling Services
CNC milling uses a rotating cutter to remove material from a stationary workpiece, producing prismatic and 3D contoured parts — housings, brackets, plates, fixtures, blocks, manifolds. Richconn provides 3-axis, 4-axis, and 5-axis milling under the same roof — so the right machine class is matched to your part complexity, not forced onto the equipment we happen to own.
3-axis handles flat plates and simple housings; 4-axis adds an indexing rotary for parts with features on multiple faces; 5-axis enables simultaneous five-axis motion for compound angles, undercuts, and parts that would otherwise require multiple setups (and accumulated tolerance stack).
5-Axis CNC Machining
5-axis CNC machining moves the cutter (or workpiece) on three linear axes plus two rotary axes simultaneously, allowing the tool to approach the part from virtually any angle. This eliminates re-fixturing for parts with compound geometry — every feature shares the same datum, so you avoid accumulated re-fixturing error and inter-operation tolerance stack.
5-axis is the right process for complex housings with features on five faces, robotic joint components, aerospace structural brackets, medical instrument bodies, impellers, and any 3D contoured surface. Our 5-axis cells are integrated into our standard CNC milling capability — you don’t pay a separate “5-axis premium” if 3-axis would over-fixture and degrade your tolerances.
Swiss CNC Machining
Swiss CNC machining uses a sliding headstock and guide bushing that supports the workpiece within 1–2 mm of the cutting tool. The result: cutting forces act on a rigidly supported section, not on a long unsupported bar — making it possible to machine slender parts with length-to-diameter ratios up to 30:1 without chatter or deflection.
This is Richconn’s signature capability. We operate CITIZEN A16 and A20 and TSUGAMI B206 Swiss-type machines for bar diameters from Ø 0.5 mm to Ø 32 mm, with achievable tolerances down to ±0.001 mm on critical features and Ra 0.4 µm surface finish. Typical Swiss-machined parts: pogo pin contacts, probe card pins, miniature connector pins, medical pins, bone screws, catheter drive shafts, camera actuator shafts, micro fasteners under M2.
Turn-Mill Machining
Turn-mill machining combines a CNC lathe with live milling, drilling, and tapping tools — often with a sub-spindle and B-axis articulating head — so turning, milling, drilling, cross-holes, keyways, and threads are completed in a single setup. Every feature shares the same datum: no re-fixturing, no inter-operation tolerance stack, no handling damage between operations.
This is the right process for complex shaft-and-feature parts conventional split-operation shops can’t hold tolerance on — precision shafts with cross-holes, keyways, splines, and end-thread features; robotic actuator shafts with mating features on both ends; non-standard automation pins with milled flats and tapped holes; hydraulic and pneumatic fittings with multi-angle ports.
Custom CNC machined parts we manufacture.
Below are part categories Richconn produces in regular volume. Each row maps part type to the CNC process best suited and typical materials — so you can confirm fit before sending drawings.
| Part Category | Example Parts | Typical Process | Common Materials |
|---|---|---|---|
| Precision Turned Parts | Drive shafts, dowel pins, sleeves, bushings, spacers, threaded inserts | CNC turning + live tooling | SUS304, 17-4PH, brass C360, 6061-T6 |
| Swiss Machined Parts | Pogo pin contacts, probe pins, micro shafts, miniature fasteners, medical bone pins | Swiss CNC (CITIZEN / TSUGAMI) | 303 SS, brass H62, BeCu, Ti Gr5 |
| Milled Parts | Sensor housings, mounting brackets, optical plates, manifold blocks, fixtures | 3/4/5-axis CNC milling | 6061-T6, 7075-T6, A2 tool steel, PEEK |
| Robotic Components | Actuator shafts, sensor housings, joint parts, precision bushings, end-effector brackets | Turn-mill + 5-axis | Aluminum 7075, SUS316, Ti Grade 5 |
| Semiconductor Parts | Test probe pins, probe card components, wafer positioning parts, precision sleeves | Swiss + 5-axis + CMM | 17-4PH, BeCu, anodized aluminum |
| Automation Parts | Guide shafts, locating pins, custom fixtures, mounting blocks, cam followers | Turn-mill + milling | SUS304, hardened D2, 6061-T6 |
| Heat Sink & Connector Parts | Custom heat sinks, liquid cooling plates, busbars, terminals, contact pins | 5-axis milling + Swiss + plating | C110 copper, C101 OFC, 6061-T6 |
CNC machining materials we work with.
Richconn machines over 40 metal and engineering plastic grades. Below are the materials we run regularly, with the part types each grade is most often specified for. All raw stock is sourced with mill certificates for full traceability.
Metals / 8 Categories
| Material | Common Grades | Suitable Parts |
|---|---|---|
| Aluminum | 6061-T6, 7075-T6, 6082, 2024 | Housings, brackets, heat sinks, optical plates, drone frames |
| Stainless Steel | 303, 304, 316, 316L, 17-4PH | Drive shafts, medical pins, marine components, corrosion-resistant fittings |
| Brass | C360, H59, H62 | Connector pins, fittings, threaded parts, decorative hardware |
| Copper | C110 (ETP), C101 (OFC) | Busbars, electrical contacts, heat-transfer components, RF parts |
| Titanium | Grade 2 (CP), Grade 5 (Ti-6Al-4V) | Aerospace brackets, medical implants, lightweight high-strength parts |
| Tool Steel | D2, SKD11, H13, A2 | Tooling inserts, wear-resistant fixtures, punch and die components |
| Carbon Steel | 1018, 1045, 4140 | General machinery, shafts, gears (often heat-treated) |
| Inconel | 718, 625 | High-temperature aerospace and energy components |
Engineering Plastics / 5 Categories
| Material | Grades | Suitable Parts |
|---|---|---|
| PEEK | Industrial / medical-grade | Insulating parts, high-temperature seals, medical components |
| POM (Delrin) | POM-C, POM-H | Gears, bushings, low-friction sliding parts |
| PTFE (Teflon) | Standard, glass-filled | Seals, electrical insulators, chemical-resistant parts |
| Nylon | PA6, PA66, PA12 | Bushings, gears, wear-resistant guides |
| Acetal / ABS / PC | — | Enclosures, prototype parts, structural plastics |
Specify your grade CNC machining materials page →
Surface finishes for CNC machined parts.
The right finish protects your part from corrosion, improves appearance, controls dimensional fit, or meets a downstream spec (RoHS, FDA, ITAR). Below are the finishes Richconn applies in-house or through audited partner workshops.
As-Machined
Metals & plastics
Functional prototypes, fastest delivery
Anodizing — Type II
Aluminum 6061 / 7075
Corrosion resistance, decorative color (clear, black, red, blue, gold)
Hardcoat — Type III
Aluminum
High wear resistance, 25-80 μm hard oxide
Bead Blasting
Aluminum, stainless, brass
Uniform matte cosmetic surface
Polishing
Stainless, aluminum, brass
Smooth Ra ≤ 0.2 μm, mirror finish
Electroplating
Steel, brass, copper
Zinc / nickel / chrome / gold — conductivity or corrosion
Passivation
Stainless (303/304/316/17-4PH)
Restores Cr-rich oxide layer per ASTM A967
Powder Coating
Aluminum, steel
Durable colored finish, indoor/outdoor
Heat Treatment
Tool steel, alloy steel, 17-4PH
Hardness HRC 40-62, strength, stability
Laser Marking
Metals, some plastics
Permanent part number, batch code, logo
CNC machining tolerances and quality standards.
CNC tolerance is the single most asked-about spec from procurement engineers. The numbers below are what Richconn can hold in series production with documented inspection records — not best-case single-piece values.
CNC Turning
ISO 2768-m
±0.01 mm
1.6 μm
CNC Milling (3/4/5-axis)
ISO 2768-m
±0.01 mm
1.6 μm
Swiss CNC (CITIZEN / TSUGAMI)
±0.005 mm
±0.001 mm OD/ID
0.4 μm
Turn-Mill Machining
±0.01 mm
±0.005 mm concentricity
1.6 μm
Grinding (post-process)
±0.003 mm
±0.002 mm
0.2 μm
Richconn does not claim tolerances we cannot stably maintain in production. If your drawing requires tighter than ±0.001 mm on a Swiss-machined feature, send the drawing and we will tell you honestly whether the process can hold it — including whether post-grinding or specialized inspection is required.
Inspection Equipment
/ 7 Systems- CMM — Coordinate Measuring Machine for dimensional and GD&T verification
- Rational 2D/2.5D Optical — Thread pitch, spline profile, feature geometry
- RKE CCD — Automatic high-volume defect and burr sorting
- Seiko SII XRF — Material composition + RoHS compliance
- Profile projector, micrometers, height gauges, Ra tester
- Vickers hardness — Heat treatment verification
- Mill certificates — Full chemistry & mechanical traceability
Reports Available
/ Standard Package- FAI report — every new part number
- CMM full dimensional report — on request, every lot
- Material certificate of conformance — every order
- Surface / heat treatment report — when specified
- Lot traceability — batch, machine, operator, date
- SPC data — ongoing batch production
From CNC prototypes to production machining.
Richconn supports the full lifecycle — from a single validation prototype to ongoing batch production. The right quoting and process strategy differs by stage.
Prototype
- Quote within 2 hours
- Free DFM review
- Material recommendation
- Functional testing samples
- Iterative revision support
Low-Volume
- Stable process with documented setup
- Cost optimization (material, nesting, toolpath)
- Batch consistency by FAI + in-process
- Quantity-tier pricing
Batch Production
- Fixed process documented in SOP
- Dedicated inspection fixtures
- Statistical process control
- Lot traceability
- MOQ-amortized tooling cost
Industries using Richconn custom CNC machining services.
Roughly 60% of our production volume is in robotics, semiconductor, and medical — where tight-tolerance precision parts are mission-critical.
Robotics & Automation
Robotic joint components, actuator shafts, sensor housings, precision bushings, guide rails, end-effector brackets, locating pins.
Semiconductor Equipment
Probe pins, test fixtures, wafer positioning parts, connector pins, vacuum chamber parts, anodized aluminum process plates.
Medical Devices
Surgical instrument shafts, medical pins, device housings, stainless steel implant components, drug-delivery actuator parts.
Aerospace
Lightweight aluminum brackets, titanium structural parts, sensor mounts, aerospace fittings (per drawing, ITAR-aware handling).
Automotive & EV
Sensor housings, drive shafts, fittings, battery fixtures, aluminum mounting brackets, EV connector parts.
Industrial Automation
Guide shafts, locating pins, custom fixtures, mounting blocks, cam followers, machine-builder spare parts.
Electronics & Consumer
Heat sinks, liquid cooling plates, RF connector parts, conductive copper busbars, precision enclosures.
Optical & Test Instruments
Optical fixtures, alignment plates, lens mounts, precision spacers, test rig components.
More industries See industry-specific case studies →
Why choose Richconn for custom CNC machining?
Every claim below is backed by equipment, documentation, or a process you can audit. We don't lead with "high quality, fast delivery, competitive price" — we lead with evidence.
Real Swiss & Turn-Mill, Not Outsourced
We operate CITIZEN A16, CITIZEN A20, and TSUGAMI B206 Swiss-type machines in-house — verified by visit, equipment photos available on request. Most "CNC machining" listings on B2B platforms route Swiss work to anonymous sub-suppliers. Richconn does the work where you can audit it.
Tolerance We Can Document
±0.001 mm on Swiss-machined OD/ID with CMM-recorded inspection data per lot. We send the actual CMM report — not a generic "tolerance achieved" claim. Rational optical and Seiko XRF data is recorded in the lot file.
DFM Review Before You Pay
Every quote includes a free DFM review — tool-radius interference on internal corners, deflection risk on thin walls, deep-hole feasibility, thread depth-to-diameter ratio, cost-driver feedback. You get the review whether or not you place the order.
Real Engineers, Not a Quoting Bot
Quotes go through engineers with 5+ years of CNC programming experience. If your drawing has GD&T that conflicts with the indicated process (or a tolerance the process can't hold), you'll hear about it before production — not after.
Flexible Volume — 1 to 100,000+
No hard MOQ. Per-unit pricing reflects setup amortization across your quantity tier. We quote 5 pieces and 50,000 pieces with the same engineering attention.
Shenzhen Supply Chain, Global Delivery
Located in Longhua District, Shenzhen — the highest density of precision machining and surface treatment suppliers in China. We deliver to North America, Europe, Japan, and APAC with EXW, FOB, DAP, and DDP options, plus full export documentation.
How to get a custom CNC machining quote.
Sending us your drawings does not commit you to an order, and your files are protected under NDA on request. Here is what we need to return an accurate quote within 2 business hours.
Upload Your Files
/ You Send3D CAD (STEP, STP, IGES, X_T) + 2D drawing (DWG, DXF, PDF) with GD&T, tolerances, finish notes.
Confirm Requirements
/ You SendMaterial grade, quantity, finish, target delivery date, shipping destination.
Engineering Review
/ Richconn DoesEngineer checks manufacturability, flags tolerance / radius / thin-wall risks, suggests cost savings.
Quotation
/ Richconn DoesUnit price by quantity tier, tooling cost if any, lead time, and shipping options within 2 business hours.
Production
/ Richconn DoesFAI → production → in-process inspection → final inspection. PO + sample approval from your side.
Delivery
/ Richconn DoesAnti-corrosion packaging, inspection report, full export documents, courier or freight to your destination.
Design guidelines for custom CNC machined parts.
The design decisions you make in CAD have more impact on CNC part cost than any other single factor — often 2–5× more than material choice. Below are the rules we use during DFM review.
Internal Corners
End mills cannot produce sharp internal corners — the corner radius will be at least the tool radius.
Specify internal corners with R ≥ 1/3 of cavity depth, or use a dog-bone undercut if a true sharp corner is required.
Thin Walls
Walls thinner than 0.8 mm (metals) or 1.5 mm (plastics) deflect under cutting forces and may not hold tolerance.
Wall thickness ≥ 1.0 mm aluminum · ≥ 0.8 mm steel · ≥ 1.5 mm plastics. Flag thinner walls in advance.
Deep Holes
Hole depth-to-diameter ratio above 4:1 increases cost; above 10:1 may require gun-drilling or alternative process.
Keep hole depth ≤ 4× diameter where possible.
Thread Engagement
Thread engagement of 1.5× diameter is sufficient for most applications — going deeper risks broken taps without adding strength.
Specify thread depth ≤ 1.5× major diameter; specify class (6g standard, 4h precision) explicitly.
Selective Tolerancing
Apply tight tolerances only where function requires them. Global ±0.01 mm typically adds 20–40% to unit cost vs. selective tolerancing.
ISO 2768-m on non-critical features; ±0.01 mm only on mating or sealing surfaces.
Surface Finish Allowance
Anodizing adds 5–25 μm on aluminum; hardcoat (Type III) adds 25–80 μm and significantly changes dimensions.
Specify "machine to size before anodize" or "machine for anodize allowance" explicitly on the drawing.
Material Selection
Material accounts for 30–60% of CNC part cost. 6061-T6 is the default aluminum; 304 SS is the default stainless.
Ask before specifying titanium or Inconel — cost difference is often 10× the standard alloy.
Get DFM Feedback Early
Re-quoting after production drawings are released costs everyone time. Send a preliminary design before final release if you want manufacturability input.
DFM review is free with every quote — use it as a design tool, not just a procurement step.
Ready to get a custom CNC machining quote?
Upload your CAD files and 2D drawings — our engineers will return a quote with free DFM feedback within 2 business hours. NDA available on request.
