CNC Turning Services

ISO 9001:2015 Certified | +-0.003mm Tolerances | Live Tooling (Mill-Turn) | No MOQ | DFM Review Included

Qingdao Inside Industry provides precision CNC Turning Services from our ISO 9001:2015 certified manufacturing facility in Qingdao, China. We specialize in high-accuracy CNC lathe turning for shafts, bushings, sleeves, flanges, and threaded components — serving global OEM manufacturers in aerospace, automotive, medical, and industrial automation sectors.

From single prototypes to high-volume production runs, our CNC turning capabilities include standard 3-axis turning, live tooling (mill-turn) operations, and a comprehensive range of secondary operations — all under one roof, with full Hexagon CMM inspection and documentation.

ISO 9001:2015 Certified
+-0.003mm Minimum Tolerance
Hexagon CMM + Optical Comparator
Live Tooling (Turn-Mill) Capability
No MOQ — 1 Piece to 100,000+
Free DFM Review Included

What Is CNC Turning?

CNC turning is a subtractive manufacturing process where a computer-controlled lathe rotates the workpiece at high speed while a cutting tool moves along programmed axes to remove material and produce cylindrical geometries — shafts, rods, bushings, flanges, threaded connectors, and complex rotational profiles.

For industrial buyers, CNC turning delivers two key advantages: dimensional repeatability across large production runs, and the ability to hold critical fits (H7/h6 bearing fits, G6/H6 seal fits) consistently from first article to final shipment. Our live tooling turning centers add milling, drilling, and cross-tapping capability in a single setup — eliminating the need to transfer parts between machines and maintaining perfect concentricity throughout.

Experience the Top Precision CNC Turning Services in China

Every project is unique, and at Qingdao inside industry, we offer customized CNC turning solutions tailored to your specific requirements.
From prototype to production, we work closely with you to ensure your components meet exact specifications.

Customized Solutions

We specialize in providing tailored CNC turning services to match unique project specifications, ensuring that our clients receive precision turned parts that perfectly fit their needs.

High Precision and Accuracy

Our advanced CNC machines achieve precision up to ±0.003mm, ensuring every part produced through our precision CNC turning services meets the highest ISO standards for accuracy and performance.

Rapid Turnaround

We understand the importance of deadlines. Our streamlined CNC lathe production processes enable us to deliver high-quality industrial parts quickly, helping you stay on schedule.

Wide Range of Materials

Whether you need to manufacture turned parts from metals or specialty alloys, our strong supply chain will find the right material for your application.

Competitive Pricing

We offer high-quality CNC turning services at competitive prices, providing exceptional value for your investment and helping you stay within budget.

Global Accessibility

With offices in Qingdao, China and a strong global network, we are well-equipped to serve clients worldwide, ensuring smooth communication and seamless service.

CNC Turning Capabilities & Equipment

Our CNC turning centers with live tooling capability combine lathe turning and milling operations in a single setup — eliminating secondary machine transfers and maintaining datum consistency for complex components.

Cross-drilled holes and radial features without re-fixturing
Milled flats, hexagons, and keyways on turned shafts
Off-center features and eccentric profiles in one operation
Threading (internal and external), knurling, and grooving combined with turning

Live tooling is ideal for: drive shafts with keyways, valve stems with cross-ports, medical device housings requiring both turned OD and milled pockets, and any rotational component with non-cylindrical features.

Standard CNC Turning

Parameter	Metric	Imperial	Notes
Minimum part diameter	2.0 mm	0.079 in	Swiss-type / small parts
Maximum part diameter (OD)	300 mm	11.8 in	VERIFY THIS WITH SHOP FLOOR
Maximum bar stock diameter	65 mm	2.56 in	Bar feeder limitation
Maximum machining length	1,000 mm	39.4 in	Z-axis stroke
Minimum tolerance	+-0.003 mm	+-0.0001 in	For precision bearing fits
Maximum spindle speed	20,000 rpm	—	For small diameter finish turning
Surface roughness (as-turned)	Ra 0.8 um	Ra 32 uin	Standard finish
Surface roughness (fine finish)	Ra 0.4 um	Ra 16 uin	With finishing passes

Accuracy & Tolerances (ISO Standard)

Nominal Size	Plastics (ISO 2768-m)	Metals (ISO 2768-f)	Typical Application
0.5 – 3 mm	+-0.1 mm	+-0.05 mm	Small pins, miniature shafts
3 – 6 mm	+-0.1 mm	+-0.05 mm	Standard small shafts, screws
6 – 30 mm	+-0.2 mm	+-0.1 mm	Bushings, medium shafts
30 – 120 mm	+-0.3 mm	+-0.15 mm	Flanges, large bushings
120 – 400 mm	+-0.5 mm	+-0.2 mm	Large shafts, drum components
400 – 1000 mm	+-0.8 mm	+-0.3 mm	Long shafts, lead screws

For bearing-fit applications (H7/h6, H8/f7), press-fit bushings, and hydraulic seal faces, we apply tighter than ISO 2768-f tolerances on critical features, verified by Hexagon CMM.

CNC Turning Materials

Our Precision CNC Turning Services support a wide range of engineering materials, ensuring high-performance results for every custom turned component.

All materials are sourced from qualified suppliers with full material certification (MTR) and traceability from mill to finished part.

CNC Turned Parts Gallery

Explore our gallery to see the precision and craftsmanship that go into every CNC turned part we produce.

precision-cnc-machined-high-pressure-fuel-injector-body

performance-welded-exhaust-manifolds-sheet-metal-fabrication

high-performance-drilled-slotted-brake-rotors-casting

heavy-duty-cnc-machining-aircraft-landing-gear-components

forged-automotive-clutch-pressure-plate-friction-disc

cnc-machined-weld-neck-flange-stainless-steel

custom-forged-or-cast-automotive-steering-knuckle

custom-gearbox-gear-shafts-cnc-turned-and-milled

forged-aluminium-automotive-engine-pistons-cnc-finish

CNC Turned Parts Surface Finishes

We deliver fully finished CNC turned parts from a single supplier — including machining, secondary operations, and surface finishing — eliminating the complexity of managing multiple vendors.

Secondary CNC Turning Operations

Our CNC turning centers support a full range of secondary operations in a single setup or as follow-on processes — delivering complete, assembly-ready components and eliminating the need for multiple suppliers.

These secondary processes help reduce post-assembly cost and supplier complexity.

Quality Control for CNC Turning -- ISO 9001:2015

At Qingdao Inside Industry, every CNC turned part passes through a structured four-stage inspection workflow before shipment. Key quality metrics for turned parts — concentricity, cylindricity, surface roughness, and thread form — are verified using calibrated metrology equipment.

Focus Measurements for Turned Parts

Cylindricity: Ra 0.8um as standard; Ra 0.4um for fine-finish applications
Thread form: Go/No-Go gauge verification for all threaded features
Bearing fit: H7/h6 and H8/f7 verified by precision bore gauge (Mitutoyo 511 series)
Surface roughness: Ra measured per ISO 1302 using Mitutoyo SJ-410 profilometer

Qingdao-Inside-Industry-CMM-Global-Classic-Coordinate-Measuring-Machine

Qingdao-Machining-Quality-Control-Hexagon-VIEWMAX-2.5D-VMM

CNC Turning Applications by Industry

Our Precision CNC Turning Services support multiple critical industries, providing reliable components for high-stress environments.

Common Pitfalls When Sourcing CNC Turning Services

Many buyers face challenges when sourcing CNC turning services. Common mistakes include:

Pitfall	Consequence	How We Prevent It
Overlooking provider expertise	Parts returned, rework costs, project delays	10+ years CNC turning experience; reference list available on request
Ignoring quality assurance	Non-conforming parts in production, costly recalls	ISO 9001 system; FAI, CMM reports, MTR provided as standard on every order
Choosing by lowest cost alone	Poor surface finish, loose tolerances, missed deadlines	Transparent pricing; DFM review eliminates unnecessary cost without compromising quality
Lack of clear communication	Misunderstood specs, wrong material, wrong finish	Dedicated English-speaking project manager; written DFM feedback before production
Ignoring post-processing	Assembly problems from burrs, incorrect finish specification	Full secondary operations and finishing in-house; assembly-ready parts delivered
Not considering location & logistics	Unexpected shipping costs, customs delays, long lead times	Located near Qingdao Port; FOB/CIF/DAP/DDP terms; experienced export documentation team

CNC Turning Factory in Qingdao, China

Our CNC turning facility is located in Chengyang District, Qingdao, Shandong Province, China — 15km from Qingdao Port and 8km from Qingdao Jiaodong International Airport, providing reliable sea freight and air freight options for global customers.

Detail	Information
Location	Chengyang District, Qingdao, Shandong, China
Certification	ISO 9001:2015
Turning Equipment	CNC turning centers (3-axis and live tooling/turn-mill)
Export Terms	FOB Qingdao / CIF / DAP / DDP — all Incoterms supported
Prototype Lead Time	3-7 business days (standard); expedite available
Production Lead Time	15-25 days depending on quantity and complexity
File Formats Accepted	STEP, IGES, DXF, PDF 2D drawings
Working Hours (CST)	Monday-Saturday: 08:00-18:00 (UTC+8)
Quote Turnaround	DFM feedback + quote within 24-48 hours of file receipt

Frequently Asked Questions -- CNC Turning Services

What is the difference between CNC milling and CNC turning?

CNC turning rotates the workpiece against a stationary cutting tool to produce cylindrical geometries — shafts, rods, bushings, flanges, and threaded connectors. CNC milling keeps the workpiece stationary while rotating multi-tooth cutting tools remove material to create flat faces, pockets, slots, and complex 3D profiles. Many components require both: for example, a shaft may be turned on the lathe, then have a keyway or cross-hole added by milling. Our live tooling (turn-mill) centers perform both operations in a single setup, eliminating part transfer and maintaining concentricity.

What is your minimum order quantity for CNC turning?

No minimum order quantity. We accept single-piece prototype orders and scale to production runs of 100,000+ pieces with the same ISO 9001 quality system throughout. For 1-5 piece prototypes, standard lead time is 3-7 business days. Prototype cost includes DFM review, CNC programming, and first-article CMM inspection — no hidden setup fees.

What CNC turning tolerances can you achieve?

Standard turning tolerance: +-0.05mm (ISO 2768-m for plastics, ISO 2768-f for metals). Precision applications: +-0.01mm on diameters and lengths for bearing fits and seal surfaces. Our minimum achievable tolerance is +-0.003mm for ultra-precision features, verified by Hexagon CMM. For bearing applications (H7/h6 fits), press fits, and hydraulic seal faces, we apply and verify these tighter tolerances as standard. All critical dimension results are provided in our CMM inspection reports.

Can you machine stainless steel and high-strength alloy shafts?

Yes. We regularly machine stainless steel (304, 316L, 303, 17-4 PH) and high-strength alloy steels (4140, 4340) on our CNC turning centers. For 316L medical-grade components, we provide full MTR traceability from certified mills, passivation per ASTM A380, and biocompatibility compliance documentation. For heat-treated 4140 components (28-35 HRC), we turn after heat treatment to maintain dimensional stability.

What information do you need to quote my CNC turning project?

To provide an accurate quote, please send: (1) 2D drawing in PDF or DXF format with all dimensions, tolerances, surface finish callouts, and material specification; (2) 3D CAD file in STEP or IGES format if available; (3) target quantity and required lead time; (4) any documentation requirements (FAI, MTR, RoHS, PPAP level). Email to info@insidemetalfab.com or upload via our quote request form. We return a detailed quote with written DFM feedback within 24-48 hours.

How do you protect my intellectual property?

We sign Non-Disclosure Agreements (NDAs) before reviewing any customer design files — prior to quotation, at no charge. All CAD data is stored on our internal server with restricted access controls and is never shared with third parties or used to replicate designs for other customers. Our NDA is available in English and can be sent for your review before you submit any files.

What are your payment terms?

Standard payment terms are 50% deposit upon order confirmation, 50% balance before shipment. For established customers with order history, we discuss net payment terms. Accepted methods: T/T (bank wire transfer), PayPal for small prototype orders, and L/C for large production orders. All prices are quoted in USD unless otherwise requested.

Can you provide samples or prototypes before full production?

Yes. All new projects begin with a prototype or first-article stage before production release. We complete the agreed prototype quantity (typically 1-5 pieces), perform CMM inspection, and provide an FAI report. Full production is released only after you review and approve the first-article parts. This ensures zero-surprise production quality and eliminates the risk of receiving non-conforming production batches.