All Services
At Sterling Machining, we are a UK expert in CNC and subcontract machining for a huge range of standard and exotic alloys.
Our Services
At Sterling Machining, we solve complex manufacturing challenges for customers in steel, non-ferrous and advanced-alloy markets. Whether you need one-off prototypes, full production runs or emergency spares, you’ll deal directly with the engineers who cut the metal—so nothing is lost in translation and deadlines are met without compromise.
Extrusion Tooling
Precision-engineered dies, mandrels, stems and dummy blocks for hot and cold extrusion lines.
Robust designs for extreme loads & temperatures – validated in CAD/FEA before a single chip is made.
Material matched to duty – H13, H11, Dievar, nickel alloys and tailor-selected steels, heat-treated in accredited UK facilities.
Longer in-press life – optimised coolant paths and wear-resistant surface treatments extend run lengths and slash tool-change downtime.
Experiencing premature wear or dimensional drift? Let’s diagnose the root cause and add years to your tool life.
CNC Machining
Multi-axis milling and turning centres handle everything from simple bushings to complex, five-face components.
Diameters 10 mm – 500 mm | Lengths up to 3 m.
Single-setup machining for tighter tolerances and faster lead times.
In-process probing and SPC reporting as standard.
Send us your drawings or STEP files for a rapid, no-obligation quote.
Subcontract Machining
When capacity is stretched or specialist expertise is required, we act as a seamless extension of your shop floor.
Flexible scheduling – lights-out production and weekend shifts for urgent backlogs.
Transparent pricing – fixed or open-book, whichever suits your project controls.
End-to-end traceability – material certs, FAIRs and CMM data supplied with every batch.
Keep your promises to your customers—without investing in extra machines or headcount.
Extrusion Mandrel
Slim, long-reach mandrels from Ø 13 mm to 1.5 m in length.
Proprietary anti-distortion routes minimise run-out after heat treatment.
Mirror-finish surfaces reduce pick-up and extend lubrication intervals.
Optional hard-facing for abrasive yellow-metal billets.
Shorten set-up times and cut scrap with straighter, longer-lasting mandrels.
Machining of Exotic Alloys
Inconel 625/718/R41, Waspaloy, Super Duplex, Monel 400/500 and other heat-resistant or work-hardening grades.
Rigid tooling, flood-coolant and tailored cutter paths keep heat out of the component.
Experienced operators anticipate spring-back and hard-spot issues before they arise.
Documentation packages for aerospace, offshore and nuclear applications available.
If others have said “no”, we’re ready to say “yes”.
Valve Stems
Gate, globe and bespoke stems with ACME, UN & multi-start threads.
Sizes Ø 12 mm to 3 m long, +/- 0.02 mm concentricity.
Materials from aluminium-bronze to titanium and nickel alloys.
Burnishing and lapping deliver surface finishes down to Ra 0.4 µm.
Engineered for smooth actuation and extended seal life in corrosive or high-pressure environments.
Shaft Machining
High-aspect-ratio shafts without the chatter.
Live-tailstock, steady rests and vibration-damped boring bars for flawless surfaces.
Mill-turn capability adds keyways, flats and cross-holes in the same set-up.
Dynamic balancing and non-destructive testing on request.
Talk to us about improving concentricity while cutting cycle time.
Turned Parts
Cost-effective production of small to medium batch volumes.
Bar-feed lathes for rapid cycle times on diameters 10 mm – 65 mm.
Automated in-process inspection reduces rejects to near zero.
Kanban and JIT stocking programmes keep your assembly lines moving.
From prototype to full production, we deliver consistency you can bank on.
We put precision to work
At Sterling Machining we craft solutions that keep your production lines moving and your customers happy. From first sketch to final inspection, our engineers work side-by-side with you to shorten lead-times, reduce waste and drive down total cost. Every component leaves our Chesterfield facility fully traceable and backed by rigorous in-process checks, so you can sign it off with confidence. Whether you’re chasing an urgent breakdown part or mapping out a multi-year supply programme, consider us part of your team.
Which industries do you serve?
Our core customers are in valve and flow-control, energy, offshore, rail and specialist automotive sectors. If your parts demand tight tolerances, challenging alloys or long service life, we can help.
Can you manufacture from my CAD model?
Absolutely. We accept STEP, IGES and native SolidWorks files. Our CAM team generates toolpaths directly from your geometry, reducing programming time and eliminating translation errors.
Do you offer design support?
Yes. Early-stage design for manufacturability (DfM) consultations are available. We’ll suggest tweaks that improve machinability, extend tool life and cut costs before you commit to production.
How do you assure quality?
All parts are inspected using calibrated CMMs and in-process probing. Material certificates, FAIRs and full inspection reports are supplied as standard. We work to ISO 9001 principles and can comply with AS9102 on request.
What’s the largest component you can machine?
We can turn up to Ø 500 mm and 3 m in length, mill parts up to 1.2 m × 700 mm, and produce slender mandrels up to 1.5 m long. If your requirement falls outside this envelope, we’ll point you to a trusted partner.
Do you handle exotic alloys?
Yes. Inconel, Monel, Super Duplex, Waspaloy and other heat-resistant super alloys are routine for us. We’ve invested in the tooling, cutting strategies and operator training needed to machine them efficiently.