CNC Turned Parts Manufacturer — 1 Piece to 10,000+
Shafts, bushings, connectors, nozzles and valve bodies machined to ±0.003mm with Ra 0.4μm surface finish. Factory-direct pricing, ISO 9001 certified. A real engineer quotes every file in 2 hours.
- No minimum order
- Free DFM analysis
- ISO 9001 certified
- Quote in 2 hours
// Turning machine specs
Max turning diameter：Ø 650 mm
Max turning length：2,000 mm
Tightest tolerance：± 0.003 mm
Surface finish Ra：0.4 μm standard
Thread standards：Metric · UNC · UNF · BSPT
// Live tooling (mill-turn)
Radial & axial drilling：Yes — same setup
Milled flats / keyways：No secondary op needed
Twin spindle：Available
// Volume & lead time
Prototype (1–5 pcs)：1–3 business days
Small batch (10–100 pcs)：3–7 business days
Production (100+ pcs)：7–14 business days
Ø 650mm
Max turning diameter
±0.003mm
Tightest tolerance
Ra 0.4μm
Standard surface finish
1day
Fastest lead time
Certifications
ISO 9001:2015 ISO 13485 Medical IATF 16949 NDA & IP protection 98% on-time delivery Quote in 2 hours
CNC Turning vs Milling vs Mill-Turn — Which Process for Your Part?
If your part has a circular cross-section symmetric about a central axis, turning is almost always the right answer. Here’s how to be certain — and when mill-turn handles both in a single setup.
CNC Turning
Workpiece rotates · stationary cutting tool
- Shafts, pins, bushings, connectors, nozzles
- External and internal threads — all standards
- Concentric bores — best achievable roundness
- High L/D ratio — long slender shafts
- Bar-feed automation for high volume
- Non-rotational prismatic geometry
Best for: shafts, bushings, nozzles, valve bodies, spindle nuts, hydraulic fittings, and anything symmetric about an axis of rotation.
CNC Milling
Tool rotates · workpiece is stationary
- Flat faces, pockets, slots, counterbores
- Complex 3D surfaces (5-axis)
- Housings, brackets, enclosures, plates
- Cylindrical features — possible but not optimal
- Long slender shafts — turning wins on accuracy
Best for: brackets, housings, enclosures, plates — any part where the geometry is prismatic rather than rotational.
Mill-Turn (Live Tooling)
Turning + milling in a single setup
- Rotational parts with off-axis features
- Cross-holes, radial slots, milled flats
- Eliminates secondary milling setup
- Better positional accuracy — no repositioning error
- Faster total cycle — combined operations
Best for: shafts with bolt holes, connectors with flats, valve bodies with radial porting — “mostly turned but with milled features.”
Not sure which process fits your part? Upload your drawing — the engineer decides and explains in the DFM report.
Every Turning Process — In-House, No Subcontracting
All turning operations run in our own facility on modern CNC lathes and turning centers. No handoffs, no delays, one point of contact.
Outside Diameter (OD) Turning
The primary turning operation for shafts, pins, and stepped cylindrical parts. Achieves excellent surface finish and concentricity in a single setup. Supports continuous OD, tapers, radii, grooves, and undercuts. Best-in-class Ra on cylindrical features — the continuous cutting motion produces a finer surface than milling ever can.
- Max diameter：Ø 650 mm
- Tolerance：±0.003 mm
- Surface Ra：0.4 μm standard
- Lead time：From 1 day
Internal Diameter (ID) Boring
Single-point boring for precision internal diameters — bearing seats, hydraulic cylinder bores, valve seats, and precision sleeves. OD and ID turned concentrically in the same setup, eliminating repositioning errors that accumulate in secondary boring operations. Internal threads cut in the same clamping.
- Min bore ID：Ø 4 mm
- Tolerance：H7 / ±0.005 mm
- Roundness：0.003 mm achievable
- Finish：Ra 0.4 μm
CNC Turned Parts We Manufacture Every Day
These six geometries cover 90% of all rotational CNC turning work. If your part is a variation on any of these, CNC turning is the right process — and we can quote it in 2 hours.
Shafts & Spindles
Solid and hollow shafts for motors, gearboxes, pumps, and actuators. Stepped ODs, keyways, splines, and precision-ground journals. Length to 2,000mm. Straightness to 0.02mm/m with steady-rest support on long parts.
- Materials: Al · SS · Steel · Ti
- OD tol.: ±0.003mm · h6/h7 fits
- Ra: 0.4μm standard · 0.1μm mirror
Bushings & Sleeves
Precision bore bushings, flanged bushings, and liner sleeves. OD and ID turned in the same clamping for maximum concentricity. Wall thickness as thin as 0.8mm. Bronze, stainless, aluminum, and PEEK available from stock.
- Materials: Bronze · SS · Al · PEEK
- Bore tol.: H7/H6 fit class
- Concentricity: <0.005mm TIR
Threaded Connectors
Hydraulic fittings, pneumatic connectors, instrumentation adaptors, and custom-thread components. OD turning and thread cutting in one operation — no thread chasing needed. Face seal, cone, and O-ring groove options in the same setup.
- Standards: Metric · UNC · BSPT
- Pressure: Per material spec
- Sealing: Face · cone · O-ring groove
Nozzles & Orifices
Spray nozzles, flow-control orifices, injector tips, and precision outlet nozzles. Critical internal bore diameters held to ±0.005mm for consistent flow characteristics. Stainless 316L, brass, and titanium available with electropolish option for fluid purity.
- Materials: SS 316L · Brass · Ti
- Orifice tol.: ±0.005mm
- Surface: Electropolish option
Valve Bodies & Spools
Hydraulic and pneumatic valve bodies, spool valves, and cartridge valve housings. Precise internal bore geometry and port positioning critical for valve performance and sealing. Radial porting drilled in the same mill-turn setup — no secondary operation.
- Materials: SS · Brass · Al · Steel
- Bore-to-bore tol.: ±0.010mm
- Port drilling: Live tooling
Pins, Bolts & Fasteners
Precision shoulder bolts, dowel pins, locating pins, and custom fasteners. Bar-fed automatic turning for high volumes. Thread rolling available for superior surface hardness compared to cut threads. Quantities from 1 to 50,000 pieces per month.
- Materials: SS · Steel · Al · Ti
- Volume: Up to 50K pcs/month
- Thread: Cut or rolled
Materials for CNC Turned Parts — All Available from 1 Piece
We stock common grades in bar, tube, and billet form. Specialty alloys sourced within 48 hours. No material has a minimum order quantity.
| Material | Turning performance | Best tolerance | Surface Ra | Best applications | Stock form |
|---|---|---|---|---|---|
| Aluminum 6061-T6 | Excellent — fastest cycle | ±0.003mm OD | Ra 0.4μm | Spacers, connectors, housings, shafts | Bar · tube · billet |
| Stainless 303 (free-machining) | Very good | ±0.005mm OD | Ra 0.4μm | Fittings, fasteners, instrumentation | Bar · round rod |
| Stainless 316L | Good | ±0.005mm OD | Ra 0.4μm | Medical, marine, chemical process | Bar · tube |
| Brass C360 | Excellent — best machinability index | ±0.003mm OD | Ra 0.2μm | Fittings, valves, connectors, electrical | Bar · hex bar |
| Titanium Ti-6Al-4V | Moderate — specialist tooling required | ±0.005mm OD | Ra 0.4μm | Aerospace, medical, high-strength | Bar · billet |
| Steel 4140 (pre-hardened) | Good | ±0.005mm OD | Ra 0.4μm | Shafts, pins, tooling components | Bar · round |
| Copper C110 (ETP) | Good | ±0.005mm OD | Ra 0.4μm | Electrical contacts, heat sinks | Bar · tube |
| Delrin POM-C | Excellent — clean surface | ±0.010mm OD | Ra 0.4μm | Gears, bearings, food-contact parts | Rod · plate |
| PEEK Optima (implant grade) | Moderate — moisture equilibration needed | ±0.010mm OD | Ra 0.4μm | Medical, semiconductor, high-temperature | Rod · billet |
Need Inconel 718, Hastelloy, or another specialty alloy?
We machine exotic alloys from 1 piece. Send your spec sheet — we’ll confirm availability and lead time within 2 hours.
Precision Turning Tolerances — What We Measure and How
Every precision turned part goes through a documented inspection process. CMM measurement with actual vs. nominal deviation — not a pass/fail stamp.
Achievable Tolerances by Feature Type
| Tolerance | Feature / application | Inspection |
|---|---|---|
| ± 0.050 mm | General turning — all features, no premium | Caliper / micrometer |
| ± 0.010 mm | OD, ID, stepped features — most parts | Gauge / CMM batch |
| ± 0.005 mm | Precision OD/ID — bearing fits, seal seats | CMM 100% critical dims |
| ± 0.003 mm | Tight OD — bearing journals, precision shafts | CMM 100% + thermal soak |
| Ra 0.4 μm | Standard turned surface — always included | Profilometer |
| Ra 0.1 μm | Mirror finish — extra finishing passes | Profilometer |
ISO 286 shaft/bore fit classes — H7/h6, H7/p6, etc.
We machine to any ISO 286 fit class. Specify the nominal dimension and fit class (e.g. Ø25 H7) — we calculate the tolerance band and verify on CMM. Common fits we turn every day: H7/h6 (sliding · clearance), H7/k6 (light press), H7/n6 (medium press), H7/p6 (interference). Call out the fit class — we interpret it.
L/D ratio — the turning tolerance trap
Shafts with length-to-diameter ratio above 4:1 require a tailstock to prevent deflection during cutting. Above 8:1, a steady rest is added at intermediate points. At high L/D ratios, achievable OD tolerance degrades — ±0.003mm at L/D 2:1 becomes ±0.010mm at L/D 8:1 with standard setups. Our DFM flags this and recommends whether to reduce the ratio, increase the diameter, or use precision fixturing.
5-Step Inspection Process
1.Drawing review & inspection plan
Every GD&T callout mapped to a measurement method before first chips fly. Critical characteristics identified and flagged.
2.First-article verification
First turned part fully inspected before batch continues. Setup adjusted if any dimension falls outside the process window — not just outside tolerance.
3.In-process gauging
Critical ODs and IDs gauged at regular intervals during production. Auto-gauging on high-volume runs compensates for tool wear automatically.
4.CMM final inspection
Zeiss / Renishaw CMM on all critical features. Actual vs. nominal deviation documented for every callout. CMM accuracy: ±0.0008mm MPE. Temperature-stabilised measurement room at 20°C ±0.5°C.
5.Report & certificate issued
CMM dimensional report and material mill certificate enclosed with every order. Full DHR documentation available for medical and aerospace applications.
CMM DIMENSIONAL REPORT — SAMPLE
| Feature | Nominal | Actual | Status |
|---|---|---|---|
| OD shaft journal Ø A1 | 25.000 h6 | 24.997 | PASS |
| Bore ID Ø B1 | 12.000 H7 | 12.018 | PASS |
| Runout A to datum | 0.010 max | 0.004 | PASS |
| Thread M20×2.5 6g | Go / No-Go | Go: pass | PASS |
| Surface Ra (journal) | ≤ 0.4 μm | 0.28 μm | PASS |
CMM: Zeiss Contura G2 · Temp: 20.0 °C · Inspector: BSG-QE-02
CNC Turned Parts Pricing — What Drives the Cost
Four variables explain 90% of CNC turning price differences. Understanding them before you upload lets you make smarter decisions before any metal is cut.
Cost Drivers for Turned Parts
Material — alloy grade determines cycle time
Brass C360 machines fastest — its machinability index is 100 (the reference baseline). Aluminum 6061 is 80–90. Stainless 316L is 45–55. Titanium Ti-6Al-4V is 30–40. A titanium part has 2.5–3× the cycle time of the same part in aluminum — reflected transparently in the quote as a line item. Grade matters: 316L costs more per hour than 303.
- Highest cost driver on exotic materials
Quantity — setup cost per piece is the key
Setup cost for a turned part — programming, tooling, first-article inspection — is fixed per job. At 1 piece, you absorb 100% of it. At 50 pieces, it’s 2% per part. The cost curve drops steeply between 1–20 pieces and flattens above 100. If you can order 10 instead of 1, you almost always should — unless the design is unproven.
- Most impactful at low volume
L/D ratio — long slender shafts need more setup
L/D <4:1: standard turning, no premium. L/D 4–8:1: tailstock support required — adds setup time. L/D >8:1: steady rest support needed at intermediate points, multiple setup positions, slower feed rates to avoid deflection. A 300mm shaft at Ø10mm (L/D=30) requires specialist fixturing that adds 40–80% to setup cost vs the same shaft at Ø25mm (L/D=12).
- Geometry-dependent
Tolerance & inspection — CMM time adds up fast
General turning (±0.050mm) requires caliper spot-check — negligible inspection cost. Precision turning (±0.010mm) adds gauge verification. Tight turning (±0.003mm) adds full CMM measurement with thermal stabilisation — typically 15–25 minutes per part. At 1 piece, that doubles the cost. At 100 pieces, it’s insignificant. Specifying ±0.003mm on features that only need ±0.010mm is the most common unnecessary cost driver in turned part drawings.
- Scales with quantity
Indicative Pricing
Prototype / 1–5 pieces
From $15 / pc
Brass C360 or Al 6061 · simple OD + thread · ±0.010mm · 1–2 day lead
Small batch / 10–50 pieces
Save ~40% vs single-piece unit cost
Setup amortised across batch · volume material buying
Precision titanium shaft (1–3 pcs)
From $95 / pc
Ti-6Al-4V · ±0.005mm · CMM report · 3–5 day lead
Production run (100–10,000 pcs)
Volume pricing + Cpk ≥1.67
Bar-fed turning · SPC monitoring · PPAP available
Free DFM — Written, Every Quote
Engineer reviews your drawing for L/D ratio risks, over-toleranced features, material-process fit, thread feasibility, and secondary operation count. Written report with specific cost savings identified. Average DFM savings on turned parts: 15–30% per piece. No charge — even if you don’t order.
Upload STEP or 2D PDF · Quote in 2 hours · No obligation
CNC Turned Parts Manufacturer — Supplier Comparison
| Feature | Baosheng Industry ✓ | Platform | Local job shop |
|---|---|---|---|
| Pricing model | Factory-direct, no middleman markup | Platform fee + shop margin | Direct |
| Minimum order | 1 piece — always | 1 piece (with platform fee) | Often 5–10 pieces minimum |
| Free DFM analysis | Written report, every order | Limited / algorithm-driven | Verbal only |
| CMM inspection report | Included on every precision order | Extra charge | Extra charge |
| Live tooling (mill-turn) | In-house on all turning centers | Supplier-dependent | Not always available |
| Quote turnaround | 2 hours — real engineer review | Instant — algorithm estimate | 1–3 business days |
| Design change re-quote | Free, same business day | New order typically required | Varies by shop |
| Who reviews your drawing | Your assigned CNC engineer | Platform algorithm | Shop owner / estimator |
From CAD File to Finished Turned Part — 5 Steps
1.Upload Your File
STEP, IGES, or 2D PDF. Include material, quantity, tolerance, and thread/finish notes.
2.Free DFM Review
Engineer checks L/D ratio, thread feasibility, tolerance realism, and material-process fit. Written report in 2 hours.
3.Itemised Quote
Turning, live tooling, finishing, and inspection broken out separately. No hidden setup fees. Quote valid 30 days.
4.Turn & Inspect
Parts turned and inspected in-house. Critical dimensions CMM-verified. Non-conforming parts quarantined — never shipped.
5.Ship with Docs
CMM report + material certificate enclosed. Export packaging protects precision surfaces. Tracking number at dispatch.
CNC Turned Parts Manufacturer — Questions Answered
What is the difference between CNC turning and CNC milling?
CNC turning rotates the workpiece against a stationary cutting tool — ideal for shafts, bushings, and anything symmetric about an axis of rotation. CNC milling rotates the cutting tool against a stationary workpiece — ideal for prismatic parts with flat faces, pockets, and slots. Rough rule: if your part looks like a cylinder, turn it. If it looks like a block, mill it. Parts that need both — a shaft with cross-holes or flats — are handled on our mill-turn centers in one setup.
What is live tooling and why does it matter for turned parts?
Live tooling means driven milling tools mounted in the lathe turret — drill radial holes, cut keyways and flats, mill pockets, all in the same clamping as the turning operation. Without live tooling, a shaft with cross-holes needs a second setup on a VMC, which adds repositioning error and 1–2 days of lead time. With live tooling, everything happens in one setup. If your turned part has any off-axis features, ask us about mill-turn capability before quoting.
What is the tightest tolerance you can hold on turned parts?
Our tightest standard turned tolerance is ±0.003mm on OD features in aluminum and brass, using precision setup with CMM verification and thermal stabilisation. Bore tolerances to H7 class (e.g. ±0.013mm on Ø25mm) are standard. Specifying ±0.003mm on features that functionally only need ±0.010mm adds CMM time and approximately doubles the per-part inspection cost — our DFM review identifies where it’s actually needed.
What materials can be CNC turned?
We turn aluminum (6061, 7075, 2024), stainless steel (303, 304, 316L, 17-4 PH), brass (C360), copper (C110), titanium (Grade 5 Ti-6Al-4V, Grade 4 CP, Grade 23 ELI), steel (4140, 4340, EN19), engineering plastics (Delrin POM, PEEK Optima, Nylon, PTFE), and exotic alloys (Inconel 718, Hastelloy C-276). All materials available from 1 piece. No material has a minimum order quantity.
What surface finish does CNC turning achieve?
Ra 0.4–0.8μm as-turned is standard and included in the base price — this is the natural result of correctly specified turning with sharp tooling. Ra 0.2μm is achievable in aluminum and brass with fine-finishing passes. Ra 0.1μm mirror finish requires additional polishing operations. Importantly, turning achieves significantly better surface finish on cylindrical features than milling — the continuous helical cutting path inherently produces a finer, more consistent surface texture.
Can you turn long shafts without deflection affecting accuracy?
Yes — we use tailstocks and steady rests for long shafts. The practical guideline: L/D ratio below 4:1 — standard turning, no support needed. L/D 4–8:1 — tailstock support added. L/D above 8:1 — steady rest at intermediate points. At very high L/D ratios (above 12:1), the achievable OD tolerance degrades regardless of fixturing; our DFM review flags this and may recommend a design change (larger diameter, or turning in two chucked halves with a joined centre).
What thread standards do you support?
We cut Metric ISO (M and MF series), Unified (UNC, UNF, UNEF), British Standard Pipe (BSPT, BSPP), British Standard (BSW, BSF), ACME, trapezoidal (Tr), and custom thread profiles for both internal and external features. Thread milling handles blind-hole internals, interrupted threads, and left-hand threads. Go/No-Go gauge verification is standard on all threaded features. We manufacture custom gauges for non-standard thread profiles.
Do you provide CMM inspection reports for turned parts?
Yes — CMM inspection on Zeiss and Renishaw CMMs with actual vs. nominal deviation documented for every critical feature, including OD, ID, runout, thread class, and surface Ra. CMM accuracy (MPE) is ±0.0008mm — well within our tightest turning tolerance. Roundness and cylindricity measurement available for precision bores and bearing journals. Reports included on all precision orders; per-part or batch statistical formats available depending on quantity and application.
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CNC turned parts. Factory-direct. No middlemen.
Upload your STEP file or 2D drawing. A real engineer reviews it, runs a free DFM analysis, and sends you an itemised quote in 2 hours. No algorithm, no obligation.
✓ Free DFM analysis | ✓ No minimum order | ✓ CMM report included | ✓ Quote in 2 hours | ✓ ISO 9001 certified | ✓ NDA on request