CNC turning service

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.

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 >±0.005+ mm High-precision turning across billet and bar work, supported by modern multi-axis machines.
Geometric Tolerances >±0.005+ mm* *Depending on material, finishes, and the geometry of the part.
CMM Measurement Verification to ±0.002 mm Achieved using our Axiom Too 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

Bridgeport VNM600

CNC Mill
X-Axis Travel: 600 mm
Y-Axis Travel: 400 mm
Z-Axis Travel: 350 mm

Doosan VC630 5AX

CNC Mill
X-Axis Travel: 650 mm
Y-Axis Travel: 750 mm
Z-Axis Travel: 500 mm

Bridgeport VMC1000 4AX

CNC Mill
X-Axis Travel: 1000 mm
Y-Axis Travel: 600 mm
Z-Axis Travel: 600 mm

Doosan DNM 4500

CNC Mill
X-Axis Travel: 800 mm
Y-Axis Travel: 450 mm
Z-Axis Travel: 510 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 sectors including medical, industrial, packaging and scientific equipment. Our turning expertise helps bring your designs to life, whether for prototyping or ongoing production.

Rotational & supporting elements

Pivots, bushes, bearings, sleeves, spacers, and pins are all precision-turned to provide support, reduce friction, or enable controlled movement. These high-precision components are essential in assemblies that rely on repeatable rotation, alignment, or load transfer.

Connection & fastening components

We machine connectors, hooks, buttons, and flanges that are designed to link, lock, or secure other parts or systems. These components are turned with consistency and dimensional accuracy to ensure seamless integration and lasting fit.

Structural & housing parts

Casings, enclosures, beams, brackets, and pressure vessels are turned to form the foundational or enclosing elements of larger systems. We work to your specifications to ensure rigidity, alignment, and tolerance compliance for performance-critical assemblies.

Medical, tooling & specialist items

For sectors that demand exacting precision, we turn components such as surgical instruments and custom tooling elements. Whether for regulated medical use or specialised industrial functions, these parts are produced with care, traceability, and accuracy at every step.

Examples of our high-quality CNC turned components

Interact in 3D

Electronic enclosure

Aluminium machining
Aluminium 6082 T6 with soft sulphuric blue anodising
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Machined nylon prototype

Aluminium machining
Nylon
± 0.025mm
Interact in 3D

Machined OEM tooling piece

Aluminium machining
Black Nylon
±0.005"
Interact in 3D

Aluminium Machined Part

Aluminium machining
Material: Aluminium
Finish: Anodized
Weight: 150g

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.

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?