CNC turning services · Dongguan factory

CNC turned parts: shafts, bushings, and fittings that run true

Precision CNC turned parts for automation and robot equipment: shafts, bushings, nozzles, and threaded fittings in stainless, brass, copper, aluminum, and plastics. 8 CNC lathes in our own factory, from Ø1 mm up to Ø400 × 900 mm.

Critical diameters ±0.005 mmFits to H7/g6 and tighter, runout checked.
Turn-mill in one setupLive tooling for cross holes, flats, and hexes.
Checked on our own CMMPlus micrometers, thread gauges, and pin gauges.
Copper, brass, PEEK, POMSoft and gummy materials turned clean, without burrs.

Send Your Turning Drawing Turning capability

DFM feedback before the priceRisky features flagged in the quote

Free first-article reportOn your first order

Fast repliesEmail within 24 h, WhatsApp within 12 h

Two turned shafts with flanges and bolt holes, concentric diameters, external threads, and pins fitted in-house

Part held in a CNC lathe chuck during turning at Meili Machining — CNC lathe with live tooling

Turning capability

Turned and milled in one setup, held to ±0.005 mm

Turn and mill in one setupLive tooling drills cross holes, mills flats and hexes, and taps threads while the part is still in the chuck.
Features stay concentricNo re-clamping between turning and milling, so milled features stay true to the turned diameters.
Critical diameters to ±0.005 mmConfirmed at drawing review, measured with micrometers, pin gauges, and our in-house CMM.

Lathes: 8 in-house, 2 turn-mill
Diameter range: Ø1 to Ø400 mm, length to 900
Standard tolerance: ±0.02 mm
Critical diameters: ±0.005 mm
Runout: 0.01 mm, checked on the machine
Surface finish: To Ra 0.2 µm on some stainless

CNC turned parts are round parts made on a computer-controlled lathe: the bar or blank spins while a cutting tool shapes its outside and inside diameters, faces, grooves, and threads. Shafts, bushings, pins, sleeves, nozzles, and threaded fittings are typical CNC turned components. On a lathe with live tooling, cross holes, flats, and hexes are milled in the same setup, so they stay true to the turned diameters.

Our lathes

8 CNC lathes, chosen for precision rather than volume

Machines	Count	Used for
CNC lathes with live tooling	4	Turned parts with cross holes, flats, and tapped holes
Turn-mill centers	2	Complex parts finished in one setup
Gang-tool lathes	2	Small, fast turned parts such as pins and bushings

Turning is about 30% of our work, mostly for automation and robot equipment. Many of these parts are turned first and then finished on our 3+2 milling centers, so turned diameters and milled features stay related to one datum.

What we do not have: Swiss-type lathes or bar feeders. For tens of thousands of small pins from bar, a dedicated screw-machine shop will be cheaper. We are a better fit for precise parts in batches of 20 to 10,000 pieces, with prototypes as the first step toward the batch.

How we keep turned parts true

Long shafts, runout, and threads

Long, slender shafts. Steady rest or tailstock center, chosen by material and shape. What matters most is how the part is clamped and supported in the middle or at the center, then feed and spindle speed are set to keep it from springing.
Runout to 0.01 mm. Checked with a dial indicator on the machine while the part is still clamped, so it can be corrected before it comes off.
Threads. Metric, unified (UNC/UNF), and pipe threads. Where no standard gauge exists, we have a custom thread gauge made for the part.
Size range. From Ø1.0 mm up to about Ø400 × 900 mm.
Lead time. Simple turned parts in about 5 days, complex parts in about 15 days.

CNC turned stainless steel housing with deep ring grooves, a perforated sleeve, a flange, and an external thread — The finished stainless housing. Background softened to keep the customer's drawing private.

Stainless steel · 10 pcs · turn-mill

A part another shop could not finish

This stainless housing came to us after another supplier could not make it. The hard part was the row of deep ring grooves in the middle, held to 0.1 mm, on a part that also carries precise holes, an external thread, and imperial and metric tapped holes.

Raymond had a special grooving tool made for the deep grooves, which solved the precision turning. Everything else was machined in one setup, so the features stay related to each other. All 10 parts were delivered to the drawing.

Send a part others turned down

Turned parts that fit together

Three turned parts, one assembly

Most turned parts end up screwed, pressed, or bolted to another part. This one is three 6061 aluminum bodies that thread together, machined, anodized, and assembled in our shop.

Three black anodized turned 6061 aluminum parts before assembly: a finned body, a hex body, and a fluted sleeve — Three parts

The same three black anodized 6061 parts threaded together into one assembly with a brass threaded insert — One assembly

Threads that join three partsMating internal and external threads, so the three bodies screw together straight and tight.
Fins, grooves, and flutes turned and milledDeep cooling fins, long flutes, and a hex body with a drilled dot pattern.
Threaded insert fittedA brass insert installed in the hex body for a mounting screw.
One black, across all threeBlack anodized as a set, so the color matches when the parts are assembled.

Turning operations we run

OD and ID turningInternal and external threadsGrooves and finsBoring to fit tolerancesMilled flats, hexes, and cross holesThreaded inserts and pins fittedAssembly before shipping

Turned parts we make

CNC turned parts from our shop floor

Precision turned parts and components, photographed after inspection, with the challenge that made each one hard. If yours looks similar, we have made it before.

Three turned stainless steel shafts with threads, grooves, a milled cross block, and cross holes

Stainless steelTurn-mill

Shafts with milled cross blocks

Challenge: Threads, grooves, and a milled cross block with a bore, all concentric to the turned diameters.

6082 aluminumTobacco machinery

Thin-wall flange

Challenge: Thin, irregular wall with H7/g6 fits on inside and outside diameters plus a runout callout.

PEEK part with turned bore, milled features, and brass threaded inserts

PEEKTurn-mill

PEEK part with threaded inserts

Challenge: Turned and milled features with many precise dimensions, then brass threaded inserts fitted.

Turned pure copper cone next to two small brass fittings

Pure copper, brassTurning

Copper cones and brass fittings

Challenge: Pure copper is gummy and tears easily; conical faces turned smooth and free of burrs.

White engineering plastic split washers, flanged bushings, and a threaded nozzle

Engineering plasticsTurning

Plastic bushings and nozzles

Challenge: Holding size on a material that moves with heat and clamping, with threads that seal.

Batch of turned 6061 aluminum flanges for a robotics customer, packed in a formed plastic tray

6061 aluminumRobotics

Repeat production batches

Challenge: Same program and fixture every batch, first article checked before the run, tray-packed by part number.

Batch pricing · 20 pcs and up

Turned parts cost far less from 20 pieces

Most of the cost of a one-off part is the work before the first chip: drawing review, programming, fixturing, and proving out the first part. On one piece, that piece carries all of it. On 20, it is shared twenty ways. Ask for prices at a few quantities, for example 5, 20, and 50, and we'll quote each one.

Quote My Batch How a CNC quote is built: why batches cost less → Low-volume production: batches of 20 to 10,000 pcs →

Setup work carried by each part

1 pcall

5 pcs1/5

20 pcs1/20

Program, tooling, and first-article check set up once per batch
Once the first part passes inspection, the lathe runs the batch without changeovers
Turn-mill parts finished in one setup, with no second machine per part
Repeat orders reuse the program and tooling

Materials

Materials we turn, and what each one needs

Grades we turn every week, with the detail that matters on the lathe. Grade not listed? Send the drawing and we confirm availability before quoting.

Material	Common grades	What we watch when turning it	Finishes
Stainless steel	303, 304, 316, 440C	Work-hardens if the tool rubs; long shafts need steady support and chip control to stay straight.	Passivation, electropolish
Carbon & alloy steel	C45, 16CrMn5	Turned before hardening, with stock left for size change after QPQ or vacuum heat treatment.	QPQ, vacuum heat treatment, black oxide
Aluminum	6061, 6082, 7075	Thin walls held round; sizes cut with allowance where anodizing or plating follows.	Anodizing incl. hard (up to 50 µm), nickel plating
Brass & copper	Brass, pure copper	Brass turns cleanly for fine threads; pure copper is gummy and needs sharp tools to avoid burrs.	As machined, nickel plating, polishing
Engineering plastics	POM, nylon, PEEK	Light clamping and sharp tools so diameters stay in size; threads and edges free of burrs.	As machined; threaded inserts fitted
Titanium	TC4 / Ti-6Al-4V	Low cutting speed and rigid setup to control heat and tool wear.	As machined, bead blast

Properties and grade notes in the materials guide → Stainless steel CNC machining → Aluminum CNC machining →

Stainless steel turning

Stainless steel CNC turning, from our factory in China

Shafts, housings, bushings, and threaded fittings in 303, 304, 316, and hardenable grades, turned in our own Dongguan factory and shipped direct. Stainless cuts slowly and work hardens, so this is how we keep sizes in a batch.

Topic	How we handle it
Grades and stock	303, 304, and 316/316L in stock as bar from about Ø3 to Ø50 mm; 316Ti, 17-4PH, 420, 440C, 430, and 2205 sourced in 3 days at most. Material certificates on request.
Heat and work hardening	Dedicated stainless inserts, feeds set to keep heat down, and coolant aimed at the cutting edge. Most of it is decided at process planning, before the first cut.
Long shafts	Steady support and chip control so shafts stay straight. Runout is typically held to 0.01 mm and checked on the machine while the part is still clamped.
Deep holes and threads	The drilling method is chosen to put the least stress into the part. A small tap that breaks in stainless is removed by EDM rather than scrapping the part.
Thin walls	Solution treatment after roughing to release stress, then finishing with even clamping. Walls go down to about 0.5 mm.
Tight and hardened sizes	0.005 mm on specific features by turning, grinding, or wire EDM. 420 and 440C are hardened above HRC 50 by a partner, then critical sizes are ground.
Finishes	Passivation and electropolishing by specialist partners, bead blasting in house; sizes are re-checked when parts come back.
Lead time and cost	Simple parts from about 8 days, complex parts from about 15, including heat treatment and finishing. The same part costs about 20% more in stainless than in aluminum, mostly machining time.

Stainless steel CNC machining: grades, finishes, and cases → Thin-wall 304 rings, 48 pcs → SUS430 motor housings, 100 pcs →

Get a quote

Send what you have. Here is what we need.

A 2D drawing, a 3D model, or both. Each works, as long as we get the details the file itself can't show.

BestYou have a 2D drawing and a 3D model

The fastest, most accurate quote. The drawing carries the tolerances, the model carries the geometry.

12D drawing (PDF)23D model (STEP)

You only have a 2D drawing

That works if the drawing is clear and fully dimensioned. We build the 3D model ourselves. For complex parts, a 3D file is strongly preferred.

12D drawing (PDF)

You only have a 3D model

A model can't carry these, so tell us in your message. Features without a stated tolerance follow ISO 2768-m.

3Material5Heat treatment & finish4Quantity8Target date

Always helps:6Critical dimensions7How the part is used

Send it as one .zip, we take it from there

Drawing review and DFM feedback come with the quote. Email reply within 24 h, WhatsApp within 12 h. First order includes a free first-article report.

Send Your Drawing Package

Case notes

Turned parts from recent case notes

Thin walls that want to distort and a 10 µm diameter band, from real orders with measured results.

48 pcs

304 stainless

Thin-wall 304 conical rings

Walls that distort in a normal chuck. A dedicated fixture turned in-house, two operations per ring.

Read the case note

100 pcs

SUS430 stainless

SUS430 motor housings

A 10 µm band on Ø8. Micrometer readings 7.987 and 7.988 mm against 7.98–7.99.

Read the case note

30 pcs

TC4 titanium

TC4 titanium prototypes

±0.05 mm on diameters and hole positions, Ra 1.6, M2 threads and Ø1.6 mm holes.

Read the case note

All recent parts and case notes

FAQ

Common questions about CNC turning

Standard turned features are held to ±0.02 mm, and critical diameters to ±0.005 mm, confirmed at drawing review. Fits such as H7/g6 and runout callouts are checked with micrometers, pin gauges, and our in-house CMM. How we hold tight tolerances across a batch →

Yes. We supply CNC turned parts and precision turned components to automation and machine builders, in batches of 20 to 10,000 pieces per part number, made on our own 8 CNC lathes in Dongguan. Every order starts with a drawing review, your first order includes a free first-article inspection report, and parts ship direct by the courier you choose. Batch sizes and terms →

Yes. We turn 303, 304, and 316/316L from bar in stock, about Ø3 to Ø50 mm, and source 17-4PH, 420, 440C, and 2205 in 3 days at most, in our own factory in Dongguan. Specific diameters can be held to 0.005 mm, and simple stainless parts take from about 8 days including heat treatment and finishing. Most of this work is batches of 20 to 10,000 pieces per part number, shipped direct by the courier you choose. How we turn stainless →

Runout is typically held to 0.01 mm. We check it with a dial indicator on the machine while the part is still clamped, so any error is corrected before the part comes off, and critical sizes are measured again in inspection.

No. Our 8 CNC lathes are 4 lathes with live tooling, 2 turn-mill centers, and 2 gang-tool lathes, without bar feeders. Our best fit is batches of 20 to 10,000 precise turned parts, and we machine prototypes as the first step toward a batch; for tens of thousands of small pins, a dedicated screw-machine shop will be cheaper.

Yes. Our lathes with live tooling drill cross holes, mill flats and hexes, and tap threads while the part is still in the chuck, so milled features stay concentric to the turned diameters.

About Ø400 × 900 mm. Send the drawing and we confirm at review whether the part fits and how it will be held.

Yes. We fit threaded inserts and pins, and can thread or press parts together into an assembly before shipping, as on the three-part anodized assembly shown on this page.

Simple turned parts take about 5 days and complex parts about 15 days. Simple 6061 aluminum parts, a few pieces, can be rushed in 2 days from material in stock, with express shipping time added. We confirm the date per part number with each quote, before you order.

There is no fixed minimum quantity, but our main work is batches of 20 to 10,000 pieces per part number; prototypes are welcome as the first step toward a batch. From 20 pieces the unit cost drops sharply, because programming, tooling, and the first-article check are shared across the batch. Ask for prices at 5, 20, and 50 pieces and we will quote each one.

Drawing review with manufacturability feedback in the quote, a free first-article inspection report, and our remake guarantee: parts that do not meet your drawing are remade at our cost, with freight paid both ways. We reply by email within 24 hours and on WhatsApp within 12 hours.

Reviewed by Raymond Liang, co-founder, 15 years in CNC machining · Updated October 27, 2026

Got a shaft or fitting that has to run true?

Send the drawing. You get DFM feedback with the quote and a free first-article report on your first order. Email reply within 24 hours, WhatsApp within 12 hours.

Send Your Turning Drawing