Stainless steel CNC machining service

We deliver stainless steel CNC machining for manufacturers who need accurate, reliable components without supplier uncertainty.

With expert engineering support, robust quality control, and a process built around consistency, we help you get high-quality stainless steel parts delivered with confidence.

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ISO 9001 Certified
JOSCAR Registered
MAKE UK Defence Member
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Erjon
Procurement, Surveillance component
Everything about our experience with Penta has been perfect. From the precision of their machines to their outstanding customer service, they’ve exceeded all expectations.
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.
Agnieszka
Assistant Buyer, Electronics OEM
I would highly recommend Penta Precision in whole, not only the product quality is consistently outstanding and the pricing competitive, but also the service is excellent.
Abi
Scientific and Technical
We have a positive long standing relationship with Penta Precision. They are always friendly and professional, and respond to any queries quickly and promptly. We trust both the quality and the capability of Penta when supplying us with product and hope our working relationship only continues to grow and develop.
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.
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Precision parts, expertly manufactured

Stainless steel CNC machining you can rely on

Penta Precision provides stainless steel CNC machining services for engineers, manufacturers and OEMs across the UK.

Using advanced CNC technology, experienced machinists and ISO 9001:2015 quality standards, we produce accurate, repeatable stainless steel components for large-scale production runs.

Request a machining quote
British Assessment Bureau ISO 9001 Quality Management Accreditation
JOSCAR Registered Logo
Make UK Member Logo
Consistent milling and turning support

Stainless steel machining capabilities

Our stainless steel machining capabilities cover CNC milling and CNC turning, giving you a dependable route for complex, tight-tolerance and production-critical components. We offer:

CNC milling stainless steel parts with tight tolerances
CNC turning using multi-axis lathes and automation
Design for manufacture advice to reduce costs
Quality-focused production and inspection controls
Request a machining quoteSee how we work

Our stainless steel machining services

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CNC milling
High-precision CNC milling with 3, 4, and 5 axis CNC capabilities, ideal for complex geometries, tight tolerances, and repeatable production of custom parts.
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CNC turning
Automated multi-axis CNC turning for producing intricate or cylindrical CNC components in low or high volumes, using both modern and traditional equipment.
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Design for manufacture
Tailored design guidance to maximise efficiency, minimise production costs, and achieve precise, repeatable machining outcomes.
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Examples of our high-quality CNC machined components

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Stainless Steel Component

CNC Milling
316 Stainless Steel
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Space Component

CNC Milling
316 Stainless Steel
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Fixture

5-axis machining
Stainless Steel
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Stainless Steel Turned Component

5-axis machining
Stainless steel
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Stainless steel shaft

Stainless steel machining
CNC Turning
316 Stainless Steel

Guidelines for stainless steel 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 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

Stainless steel 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

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

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: 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

Aerospace

Aerospace

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Scientific

Scientific

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Pharmaceutical & medical

Pharmaceutical & medical

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Defence & Military

Defence & Military

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Marine

Marine

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R&D

R&D

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OEM suppliers

OEM suppliers

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Electronics & computing

Electronics & computing

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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%.
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.
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.
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.
Nadiya
Medical and Pharmaceutical
Great service and communication
Steve
Steve, Scientific and Technical
Excellent service, friendly and helpful staff. Never had a non-conformance on our system for Penta Precision.
Nadiya
Medical and Pharmaceutical & OEM
Highly recommended and customer orientated company. Professional team which meet requests in a timely manner, supportive and cooperative.
Philip
OEM
You have excellent staff that care about customers like us to keep our business.
Adrian
Purchasing, Medical
Penta Precision offers a highly professional, competitive and above all quality service. As one of our approved suppliers, we look forward to continuing to benefit from our close and ever-improving relationship.
Agnieszka
Assistant Buyer, Electronics OEM
I would highly recommend Penta Precision in whole, not only the product quality is consistently outstanding and the pricing competitive, but also the service is excellent.

More about stainless steel CNC machining

Quoting and Pricing

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Quality assurance: A guide for purchasing managers

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Case study

Driving Innovation: Stainless Steel Prototype Delivered Against the Odds

Materials
R&D
15 Sep 2011

Penta's prototype component service helps a UK domestic appliance company meet a tight product development deadline.

Common questions

What stainless steel grades do you work with?
What is your lead time for stainless steel CNC parts?
What tolerances can you achieve for stainless steel parts?
Do you support one-off prototypes and batch production?
Do you provide quality documentation or inspection reports?