UK-based aluminium CNC machining services

We manufacture high-quality aluminium CNC machined components with consistent quality and dependable delivery.

Our CNC milling and CNC turning capabilities support complex parts, tight tolerances and repeat production across demanding industries.

ISO 9001 Certified
JOSCAR Registered
MAKE UK Defence Member
David
Aerospace & Industrial
Overall excellent service, parts are delivered on time to an acceptable standard. Sales and quotation team are very responsive to our enquiries.
Nadiya
Medical and Pharmaceutical & OEM
Highly recommended and customer orientated company. Professional team which meet requests in a timely manner, supportive and cooperative.
Steve
Scientific and Technical
I have used Penta Precision for 4 years and have never had any issues with quality or the service we have received. I would have no hesitation in recommending them as a supplier of precision parts.
Russell
Medical and Pharmaceutical & OEM
Customer service is always very professional with everything done to a great detail expertise. Final product is also to a very high standard.
Mark
Scientific and Technical
I'm very grateful to have a supplier like Penta that we can rely on to deliver high quality, precision parts...Please keep up the good work.
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Trusted by engineering, procurement, and manufacturing teams

Aluminium CNC machining experts

Aluminium is one of the most widely used materials in precision machining, but consistent results still depend on the right equipment, tooling, inspection process and production control.

Penta Precision manufactures aluminium CNC machined components to exact specifications, helping customers reduce supply risk, improve part consistency and keep production moving.

From CNC milled aluminium housings and brackets to turned aluminium components and complex multi-axis work, our team supports parts that need accuracy, repeatability and reliable communication throughout the project.

British Assessment Bureau ISO 9001 Quality Management Accreditation
JOSCAR Registered Logo
Make UK Member Logo

Our aluminium machining capabilities

Whether you need CNC milled aluminium parts, turned aluminium components or repeat production of complex assemblies, our machining capabilities are built around accuracy, consistency and dependable supply. We offer: 

5 axis CNC machining
Production batches and ongoing supply
Inserts, part marking, and assembly
An array of finishes processes for aluminium

Our aluminium machining services

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View all services

Examples of our high-quality aluminium CNC machined components

Aerospace side member

Aluminium machining
CNC Milling
Aluminium L168

Heatsink

Aluminium machining
CNC Milling
Aluminium

3U or 6U satellite module

Aluminium machining
CNC Milling
Aluminium 7075 with hard anodising

Aerospace tray table arm

Aluminium machining
CNC Milling
Aluminium L95

Machined electronic heatsink

Aluminium machining
CNC Milling of extrusion
Aluminium with alocrom 1200

Milled Aluminium Bracket

Aluminium machining
CNC Milling
Aluminium 7075

Guidelines for aluminium CNC machining

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 6-8 weeks Can occasionally be reduced to 2–3 weeks depending on capacity and material lead time.
Medium Batch Production 26–100 parts 6-8 weeks Best suited to scheduled or call-off ordering for consistency
High Volume Production 100+ parts 6-8 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.
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

Aluminium CNC equipment we use

Matsura MAM72-35V

Automated 5-axis CNC Milling
Max. Work Size: Ø350 mm x H300 mm
Travel X / Y / Z: 550 / 440 / 580 mm
32 pallets, 240 cutting tools

Doosan VC630 5AX

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

Doosan Puma 2600SY

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

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

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

Doosan DNM 500

5-axis CNC Mill
X-Axis Travel: 1000 mm
Y-Axis Travel: 500 mm
Z-Axis Travel: 500 mm

Doosan DNM4500 4AX

5-axis CNC Mill
X-Axis Travel: 800 mm
Y-Axis Travel: 450 mm
Z-Axis Travel: 510 mm

Bridgeport VMC1000 4AX

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

Bridgeport VMC 600 4AX

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

Bridgeport VMC 760

CNC Mill
X-Axis Travel: 760 mm
Y-Axis Travel: 600 mm
Z-Axis Travel: 480 mm

Bridgeport XR1000

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

Bridgeport VMC 500

CNC Mill
X-Axis Travel: 550 mm
Y-Axis Travel: 350 mm
Z-Axis Travel: 350 mm

Common industry applications

Automotive & Transport

Automotive & Transport

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Defence & Military

Defence & Military

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Food processing & packaging

Food processing & packaging

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Electronics & computing

Electronics & computing

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Pharmaceutical & medical

Pharmaceutical & medical

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What our clients say

Mark
Mark, Project Procurement and Quality Specialist
You’re absolutely one of our most valued suppliers. Quality is always fantastic, quote turnaround times are excellent, and your team are always happy to help.
Nick
Nick, Operations Manager
Penta Precision have consistently provided us with excellent service... which is reinforced by their attentive and customer-focused team, who maintain a high standard of communication throughout the process.
David
Aerospace & Industrial
Overall excellent service, parts are delivered on time to an acceptable standard. Sales and quotation team are very responsive to our enquiries.
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%.
Steve
Scientific and Technical
I have used Penta Precision for 4 years and have never had any issues with quality or the service we have received. I would have no hesitation in recommending them as a supplier of precision parts.
Simon
Industrial & Marine
Penta provide an excellent service from start to end. Friendly and knowledgeable consultant and advice, superb communication throughout, outstanding attention to detail, flawless engineering and machining, on time supply, transparent pricing, clear and accurate paperwork. A genuine pleasure to do business with.

More about aluminium CNC machining

Article

Selecting an aluminium alloy

Selecting the appropriate material and grade is among the important early decisions you'll make when designing your CNC machined component. In this blog we look at the most common grades of aluminium, one of the most versatile metals, and the factors to consider to select the best grade for your next project.

Common questions