CNC Turned Parts

CNC turned parts are precision components manufactured by rotating a workpiece while cutting tools remove material to create shafts, pins, bushings, spacers, threaded components, fittings, and other cylindrical parts.

 

We machine aluminum, stainless steel, steel, brass, copper, titanium, and engineering plastics in a wide range of custom diameters and lengths. Parts can be produced to your specified dimensions, tolerances, threads, and surface finishes.

 

From 2D drawings and 3D CAD files to finished production parts, we support prototypes, small batches, and volume production with custom CNC turning services.

 

1. Dimensional & Machine Capacity

Specification	Capability
Turning Diameter	Ø3–300 mm
Turning Length	Up to 500 mm
Bar Diameter	Ø3–65 mm
Minimum Part Diameter	Ø3 mm
Minimum Wall Thickness	0.5 mm*
Maximum Part Length-to-Diameter Ratio	10:1*

 

2. Machining Tolerances

Feature	Typical Tolerance
Standard Dimensions	±0.05 mm
Precision Dimensions	±0.02 mm
Critical Dimensions	±0.01 mm*
Diameter Tolerance	±0.01–0.03 mm
Hole Diameter Tolerance	±0.01–0.03 mm
Angular Tolerance	±0.5°
General Tolerance	ISO 2768-mK or specified drawing tolerance

 

3. Threads & Machined Features

Feature	Capability
Metric Threads	M2–M64
Inch Threads	UNC, UNF
Pipe Threads	NPT, BSP
Internal Threads	Available
External Threads	Available
Thread Tolerance	6H / 6g or specified class
Grooves	Internal & external
Chamfers	Custom
Knurling	Straight & diamond
Cross Holes	Available
Blind Holes	Available
Axial Holes	Available

 

4. Materials

Material Category	Common Grades
Aluminum	6061, 6063, 7075
Stainless Steel	303, 304, 316, 17-4 PH
Carbon Steel	1018, 1045
Alloy Steel	4140, 4340
Brass	C360, C260
Copper	C110, C101
Titanium	Grade 2, Grade 5
Engineering Plastics	POM, Nylon, PTFE, PEEK

 

Close-up cutting interaction: chip formation and freshly generated surface during turning.

 

Machining Process	Best For	Typical Part Features
CNC Turning	Cylindrical and rotational parts	Shafts, pins, bushings, spacers, threads, bores, grooves
CNC Milling	Prismatic and non-rotational parts	Flats, pockets, slots, holes, steps, contours
5-Axis CNC Machining	Complex multi-sided components	Angled surfaces, deep cavities, complex contours, features on multiple faces
Turn-Milling	Rotational parts with additional milled features	Shafts with cross holes, slots, flats, keyways, off-center holes

 

How to Choose

Choose CNC Turning when most of the part geometry is cylindrical and rotationally symmetric. It is generally the most efficient option for shafts, pins, bushings, threaded parts, and similar components.

 

Choose CNC Milling when the part requires flat surfaces, pockets, slots, complex profiles, or features that cannot be efficiently produced by turning.

 

Choose 5-Axis Machining when the component has complex geometry or features on multiple faces that would otherwise require several setups. It can reduce repositioning and improve positional accuracy.

 

Choose Turn-Milling when a primarily cylindrical part also requires milling, drilling, slots, flats, or off-center features. Combining operations can reduce setups and machining time.

 

Not Sure Which Machining Process Is Right for Your Part? Send us your 2D drawing or 3D CAD file. Our machining team can review your part geometry and recommend the most suitable process for your requirements.

 

 

CNC Turned Part Type	Common Materials	Key Features	Typical Applications
CNC Turned Shafts	4140 / 1045 / 304 / 316 / 6061-T6 / 7075-T6	Steps, grooves, threads, keyways, shoulders	Motors, automation equipment, machinery
CNC Turned Pins	4140 / 1045 / 304 / 316 / 17-4 PH / 6061-T6	Precision diameter, chamfers, grooves, shoulders	Fixtures, machinery, automotive, automation
CNC Turned Bushings	Brass / Bronze / 304 / 316 / 4140 / 6061-T6	ID/OD tolerances, grooves, flanges, shoulders	Bearings, pumps, machinery, automation
CNC Turned Spacers	Aluminum / Brass / Stainless Steel / Carbon Steel	Precise length, bores, counterbores, chamfers	Assemblies, electronics, machinery, fixtures
CNC Turned Fittings	Brass / 316 / 304 / Aluminum / Steel	Internal & external threads, hex flats, bores	Hydraulic, pneumatic, plumbing, fluid systems
CNC Threaded Components	304 / 316 / 4140 / Brass / Aluminum / Titanium	Metric, UNC, UNF, NPT, BSP threads	Machinery, valves, connectors, fluid systems
CNC Turned Rollers	1045 / 4140 / 304 / 316 / Aluminum	Precision OD, bores, grooves, shoulders	Conveyors, automation, packaging equipment
CNC Turned Couplings	4140 / 304 / 316 / Brass / Aluminum	Internal bores, threads, keyways, grooves	Motors, shafts, drive systems, automation
CNC Turned Sleeves	304 / 316 / Brass / Bronze / 4140 / Aluminum	Thin walls, precision ID/OD, grooves	Machinery, pumps, hydraulic systems
CNC Turned Adapters	Brass / Stainless Steel / Aluminum / Steel	Thread transitions, bores, hex sections	Hydraulic, pneumatic, instrumentation
CNC Turned Valve Components	316 / 304 / Brass / 17-4 PH / 4140	Precision bores, threads, sealing surfaces	Valves, pumps, fluid control equipment
Custom CNC Turned Parts	Aluminum / Stainless Steel / Steel / Brass / Copper / Titanium	Complex profiles, holes, threads, grooves, custom features	OEM equipment, industrial machinery, custom assemblies

 

CNC Turning Process	What We Can Machine	Typical Features
CNC Turning	External cylindrical surfaces and profiles	Diameters, steps, shoulders, tapers
CNC Facing	Flat end surfaces	Precision end faces and part lengths
CNC Boring	Internal diameters and bores	Precision bores, stepped bores
CNC Drilling	Axial and radial holes	Through holes, blind holes, cross holes
CNC Threading	Internal and external threads	Metric, UNC, UNF, NPT, BSP
CNC Grooving	Internal and external grooves	O-ring grooves, retaining-ring grooves
CNC Parting	Separation of finished components	High-volume bar-fed production
CNC Chamfering	Edge breaking and angled edges	Entry chamfers, deburring features
CNC Taper Turning	Conical external or internal surfaces	Tapered shafts, adapters, fittings
CNC Knurling	Textured gripping surfaces	Straight and diamond knurling
Live Tooling	Milling and drilling on turned parts	Cross holes, slots, flats, keyways
Turn-Milling	Combined turning and milling operations	Complex multi-feature components

 

Secondary Operations

For parts requiring additional features, CNC turning can be combined with milling, drilling, tapping, slotting, deburring, and other secondary operations to reduce handling and improve dimensional consistency.

Material Category	Common Grades	Machining Characteristics	Typical CNC Turned Parts
Aluminum	6061, 6063, 7075, 2024	Lightweight, highly machinable, good corrosion resistance	Shafts, housings, spacers, fittings
Stainless Steel	303, 304, 316, 17-4 PH	Corrosion resistant; 303 offers better machinability, while 316 provides higher corrosion resistance	Shafts, pins, bushings, fittings
Carbon Steel	1018, 1045	Good machinability, strength, and cost efficiency	Shafts, pins, spacers, machine components
Alloy Steel	4140, 4340	High strength and wear resistance; suitable for demanding mechanical parts	Drive shafts, gears, pins, heavy-duty components
Brass	C360, C260, C464	Excellent machinability, corrosion resistance, and low friction	Bushings, fittings, connectors, valves
Copper	C11000, C10100	High electrical and thermal conductivity; relatively soft and ductile	Electrical components, terminals, connectors
Titanium	Grade 2, Grade 5	High strength-to-weight ratio and corrosion resistance; requires controlled machining	Aerospace parts, medical components, shafts

 

Need a specific material or grade? Send us your drawing and material specification for review. 

 

 

Surface Finish	Applicable Materials	Main Benefits / Features
As Machined	Aluminum, steel, stainless steel, brass, copper, titanium, plastics	Standard CNC finish with visible tool marks; suitable for general industrial components
Polishing	Stainless steel, aluminum, brass, copper	Produces a smoother, brighter surface and improves appearance
Brushing	Stainless steel, aluminum, brass	Creates a uniform directional texture and reduces visible surface marks
Anodizing	Aluminum	Improves corrosion resistance, surface hardness, and appearance
Hard Anodizing	Aluminum	Provides a harder, more wear-resistant surface for demanding applications
Passivation	Stainless steel	Removes free iron and improves corrosion resistance
Electroless Nickel Plating	Steel, stainless steel, aluminum, copper alloys	Improves wear resistance, corrosion resistance, and surface hardness
Zinc Plating	Carbon steel, alloy steel	Provides corrosion protection for steel components
Black Oxide	Carbon steel, alloy steel, stainless steel	Provides a black appearance and mild corrosion protection
Electropolishing	Stainless steel	Smooths and brightens the surface while improving corrosion resistance
PTFE Coating	Metal components	Provides low friction, non-stick properties, and chemical resistance

 

Need a specific surface finish? Send us your drawing and finish requirements for confirmation.

 

Application	Typical CNC Turned Parts	Common Uses
Automotive	Shafts, bushings, pins, spacers, fittings	Engine components, transmission systems, suspension, fuel systems
Industrial Machinery	Shafts, rollers, bushings, pins, threaded components	Machine assemblies, drives, mechanical systems
Hydraulic & Pneumatic	Valve bodies, fittings, adapters, sleeves, pistons	Hydraulic cylinders, valves, pneumatic equipment
Aerospace	Precision shafts, pins, bushings, connectors	Aircraft systems, actuators, aerospace assemblies
Medical Equipment	Precision pins, shafts, sleeves, connectors, surgical components	Medical instruments, diagnostic equipment, medical devices
Electronics & Electrical	Connectors, terminals, contacts, spacers, housings	Electrical equipment, sensors, connectors, electronic assemblies
Robotics & Automation	Shafts, pins, couplings, spacers, rollers	Robot joints, linear systems, automated machinery
Pumps & Valves	Valve stems, shafts, bushings, adapters, fittings	Fluid handling, chemical processing, water systems
Energy Equipment	Shafts, sleeves, bushings, fittings, threaded components	Power generation, energy systems, industrial equipment
Marine	Shafts, bushings, pins, fittings, connectors	Marine equipment, pumps, valves, seawater systems

 

Have a custom application? Send us your drawing and requirements for a machining review.

 

Required

2D drawing

Material grade

Quantity

 

Recommended

3D CAD

Surface finish

Annual volume

Inspection requirements

 

If Applicable

GD&T

FAI

AQL

RoHS/REACH

Packaging requirements

 

Upload Your Drawing & Get a Quote

 

Engineering workflow with decision points: DFM, process planning, FAI, inspection control, finishing verification, and shipment release.

 

Quality Control Item	Inspection Method
Material Verification	Material grade and MTC verification
Dimensional Inspection	Calipers, micrometers, height gauges
Diameter & Bore Inspection	Micrometers, bore gauges, pin gauges
Thread Inspection	Thread plug gauges and ring gauges
Geometric Accuracy	CMM and dial indicators
Surface Roughness	Surface roughness tester
Visual Inspection	Surface defects, burrs, scratches, and appearance
Final Inspection	Drawing and specification verification
Quality Documentation	Inspection reports, MTC, CoC, FAI

 

Item	Details
Individual Protection	Plastic bags, protective film, foam, or separators to prevent scratches and impact
Standard Packaging	Cartons with dividers or protective padding
Bulk Packaging	Plastic bags, PE bags, cartons, or wooden cases according to part size and quantity
Pallet Packaging	Export pallets available for larger or heavier orders
Custom Packaging	Packaging requirements can be specified by customers
Prototype Lead Time	Typically 5–10 working days*
Small Batch Production	Typically 7–15 working days*
Mass Production	Typically 15–30 working days*
Shipping	Express, air freight, or sea freight

 

1. Can you manufacture from our drawings and CAD files?

Yes. We can manufacture custom CNC turned parts from 2D engineering drawings, 3D CAD models, or customer specifications. We work with common formats such as STEP, STP, IGES, IGS, and DWG/DXF. Our engineering team reviews dimensions, tolerances, threads, material, surface finish and other requirements before production.

 

2. What CNC turning tolerances can you maintain in production?

Our typical CNC turning tolerance is ±0.05 mm, with tighter tolerances of ±0.02 mm achievable for precision features and down to ±0.01 mm for selected critical dimensions. Actual capability depends on part size, material, geometry, feature location and production volume. Critical tolerances are reviewed during drawing evaluation.

 

3. Can you provide material certificates and dimensional inspection reports?

Yes. We can provide material certificates (MTC), dimensional inspection reports, CMM reports, and Certificates of Conformity (CoC) when required. Inspection documentation can be prepared according to your drawing, purchase order and quality requirements.

 

4. Can you handle repeat production orders?

Yes. We support prototype, low-volume, small-batch and repeat production orders. For repeat parts, approved drawings, machining parameters and inspection requirements can be maintained to improve consistency between production batches.

 

5. What is your minimum order quantity?

Our CNC turning service supports prototype quantities from 1 piece, as well as small-batch and production orders. There is no fixed MOQ for standard custom CNC turned parts; the most suitable quantity and pricing are determined based on the part design, material, setup requirements and production volume.

 

6. Can you provide surface finishing through qualified suppliers?

Yes. In addition to as-machined finishes, we can arrange commonly requested secondary finishing processes through qualified suppliers, including anodizing, hard anodizing, electroless nickel plating, zinc plating, black oxide, passivation, polishing, brushing and electropolishing. Finish specifications are confirmed before production.

 

7. How do you control critical dimensions?

Critical dimensions are identified from the engineering drawing and controlled throughout production. Depending on the requirement, we use micrometers, calipers, bore gauges, thread gauges, height gauges, surface roughness testers and CMM equipment for verification. First-piece and final inspections can be performed for critical features, with inspection reports available when requested.

 

8. Can you manufacture parts with tight concentricity/runout requirements?

Yes. We can manufacture turned components with controlled concentricity, circular runout, total runout and other GD&T requirements. The achievable tolerance depends on the part geometry, diameter, material, clamping method and machining process. We review these requirements from the drawing before quoting to ensure the specified tolerances are realistic for production.

 

9. What is your typical CNC turning lead time?

Typical lead times are:

Order Type	Typical Lead Time
Prototype	5–10 working days
Small Batch	7–15 working days
Production Orders	15–30 working days

Lead time starts after drawing approval, material confirmation and order confirmation. Surface finishing, special inspection or other secondary processes may require additional time.

 

10. Can you support custom packaging and export shipments?

Yes. We can provide packaging based on part geometry, surface finish, quantity and transportation requirements. Options include individual protection, plastic bags, foam, trays, cartons and wooden cases where appropriate. We also support export shipments by express, air freight and sea freight and can coordinate packaging and shipping requirements for international orders.

Get Your CNC Quote

 

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