CNC turning service

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ISO 9001 Accredited
Cyber Essentials Plus
Tight tolerance turning

Our CNC turning service is built on reliability, clear communication, and ISO 9001:2015 quality standards.

Penta Precision is a trusted UK CNC turning company producing high-quality CNC turned parts with care and precision. CNC turning is a subtractive manufacturing process used to produce precise cylindrical and round parts.

Our CNC turning service combines 24-hour automated machines, standardised processes, and skilled operators to deliver high-quality CNC turned components. Whether you need prototype turned parts or larger batch quantities, we support projects throughout the UK.

Our CNC turning capabilities

We’re a CNC turning company trusted for our quality and customer service. Our fully integrated CAD/CAM system and modern CNC multi-axis turning centres ensure tight tolerances and repeatable accuracy. We also use more traditional equipment where needed to deliver the best value in every project.

We machine stainless steel, tool steel, aluminium, brass, engineering plastics, and other ferrous and non-ferrous metals. Each turned part undergoes inspection to ensure it meets your specifications and performance needs. You can buy CNC turning parts or order CNC turning parts online with confidence, knowing we’ll deliver precision CNC turned parts that work for you.

Guidelines for CNC machining

Lead times

CNC tolerances

Finishing processes

Max dimensions

Tab one

Order Type Quantity Range Typical Lead Time Additional Info
Prototype 1–5 parts 1–4 weeks* May vary based on complexity and material, but is flexible to the part requirements. Contact us early to discuss.
Small Batch Production 6–25 parts 4–6 weeks Can occasionally be reduced to 2–3 weeks depending on capacity and material lead time.
Medium Batch Production 26–100 parts 4–6 weeks Best suited to scheduled or call-off ordering for consistency
High Volume Production 100+ parts 4–6 weeks Longer lead times. Kanban or call-off ordering strongly advised
Kanban / Call-Off Orders Varies 24–48 hours dispatch* Stock held at Penta. Dispatch triggered by usage or schedule. Order is invoiced or paid upon call-off.
Tab two

Process
Range of Tolerances Achievable
Notes
Milling >±0.01 mm Dependent on part geometry, material and setup. 5-axis offers tighter tolerances and better repeatability.
Turning >±0.01 mm High-precision turning across billet and bar work, supported by modern multi-axis machines.
Geometric Tolerances >±0.010 mm* *Depending on material, finishes, and the geometry of the part.
CMM Measurement Verification to ±0.002 mm Achieved using our CNC CMM with 2.3µm volumetric accuracy and temperature compensation.
Tab three

Finishing Process Purpose Additional Information
Hard Anodising Adds a protective oxide layer to aluminium parts. Usually 25–30 microns thick. Typically used for parts designed for the outdoors and general engineering for corrosion resistance. This finish requires hole masking and machining allowance, so use only if needed.
Sulphuric Anodising Adds a decorative layer to aluminium. Less than 5 microns thick. Won’t offer any protection and minimal corrosion resistance. For decorative or aesthetic purposes only.
Bead Blasting Creates a uniform matte finish that removes tool marks. Ideal for reducing reflectivity and improving surface uniformity.
Powder Coating Provides a hard, colourful coating that is tough and wear-resistant. Commonly used on enclosures, brackets, and consumer-facing components.
Chromate Conversion Plating Enhances corrosion resistance while retaining electrical conductivity. Often applied to aluminium components used in electronic assemblies. Commonly referred to as Surtec or Iridite.
Polishing Achieves a smooth, high-quality surface for aesthetic or functional use. Used in medical, optical, or high-spec applications where surface finish is critical.
Nickel Plating Applies a thin layer of nickel to improve corrosion and wear resistance. Provides a bright, uniform finish. Often used for decorative parts or where moderate hardness and conductivity are needed.
Zinc Plating Adds a protective zinc layer to prevent rusting, especially on steel parts. Usually applied with a clear, yellow, or black passivate. Cost-effective option for corrosion resistance in less aggressive environments.
Burnishing Improves surface finish and work-hardens the material through controlled deformation. Produces a smooth, polished surface without material removal. Enhances fatigue strength and aesthetic appearance.
Ultrasonic Cleaning Removes fine particles, oils, and machining residue using high-frequency sound waves. Commonly used as a pre-finishing or pre-assembly process. Ideal for complex geometries and internal features. Leaves no residue.
Assembly Combines multiple components into a finished or semi-finished assembly. Used to streamline production workflows. May include press fitting, fasteners, inserts, or other mechanical joining methods.
Tab four

Process Maximum Dimensions Notes
Milling Up to X: 1000 mm, Y: 600 mm, Z: 550 mm Based on Doosan and Matsuura 5-axis machines. Max Ø350 mm × 300 mm height for 5-axis work.
Turning Max billet Ø380 mm × 580 mm length
Max bar Ø65 mm × 1100 mm length		 Applies across Mazak, Doosan Puma, and CMZ lathes. Includes Y-axis and driven tooling.
Tab five

CNC equipment we use

Mazak Quick Turn 200MY

CNC Lathe
Chuck size: 8"
Max. machining dia: Ø380 mm
Max. processing length: 38 mm / 1047 mm

Mazak Quick Turn 100M

CNC Lathe
Chuck size: 6"
Max. machining dia: Ø280 mm
Max. processing length: 340 mm

Doosan Puma 2600SY

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1100 mm
Max billet dia: Ø270 mm

CMZ TL20 MS

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1100 mm
Max billet dia: Ø270 mm

CMZ C20 YS

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1050 mm
Max billet dia: Ø230 mm

CMZ TL20 MS

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1000 mm
Max billet dia: Ø350 mm

What components can we turn?

We turn a wide variety of CNC components to support different mechanical functions, industries, and assembly needs. Whether your part is made from engineering plastics, aluminium, stainless steel, or another metal, our team delivers consistently high-quality turned parts with tight tolerances and reliable lead times.

From bearing bushes to flanged connectors and surgical instruments, we supply precision-turned parts across a wide variety of sectos. Here's just a few examples of applications our turned parts can support:

Rotational & supporting elements

Components for assemblies that rely on repeatable rotation and alignment.
- Pivots
- Bushes
- Bearings
- Sleeves
- Spacers
- Pins

Connection & fastening

Parts designed to link, lock, or secure other parts or systems.
- Connectors
- Hooks
- Buttons
- Flanges

Structural & housing

Parts that form the foundational or enclosing elements of larger systems.
- Casings
- Enclosure
- Beams
- Brackets
- Pressure Vessels

Medical & surgical

Precision-engineered components for medical and life sciences.
- Surgical instruments
- Medical implants

Examples of our high-quality CNC turned components

Interact in 3D

Filter

Plastic machining
CNC Turning
PTFE
Interact in 3D

Materials testing component

Brass machining
CNC Turning
Brass with nickel coating
Interact in 3D

Rod

Brass machining
CNC Turning
Brass
Interact in 3D

Paddle stirrer

Aluminium machining
CNC Turning
Aluminium 6082 T6 with natural sulphuric anodising
Interact in 3D

Conductivity Reference Standards

Copper machining
CNC Turning
Copper C101
Interact in 3D

Bronze Component with Thread

Bronze machining
CNC Turning
Phosphor Bronze
Interact in 3D

Bronze Bushing

Bronze machining
CNC Turning
Bronze

What our clients say

Leanne
Senior buyer at bicycle firm
We’ve worked with Penta on several complex projects, and their consistency and attention to detail have been second to none. The team is quick to respond and flexible.
Andrea
Buyer
Penta is highly recommended for their quality, responsiveness and customer service. We have experienced a lot of change with our parts and Penta has always accommodated the adjustments needed in a timely manner. The quality is 100%.
Mark
Senior buyer at coffee brand
The quality of the plastic mouldings you machined were exceptional.

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CNC turning is a widely used manufacturing process that creates precise cylindrical parts. This computer-controlled process delivers exceptional accuracy, speed, and repeatability. If you're looking to produce precision components with efficiency, CNC turning is a key solution. In this guide, you'll learn what CNC turning is, how it works, and what machines and materials are involved.

Common questions

How do I get a quote for my turned parts?
Is there a minimum order quantity (MOQ)?
How long are lead times for CNC turning?
Can I get a prototype before full production?