Subcontract Machining
When your own machines are fully booked or a project demands skills, capacity or materials you don’t keep in-house Sterling Machining becomes a seamless extension of your factory floor. For more than 15 years we’ve supplied precision-machined parts and complete assemblies to customers worldwide, providing the one thing every buyer wants most: peace of mind.
Why partner with Sterling?
Instant capacity, zero cap-ex – tap into our multi-axis lathes, 4-axis machining centres and lights-out production cells without the cost of new equipment.
Scalable from 1-off to 10,000+ – prototypes today, repeat batches tomorrow, Kanban stock next quarter.
Exotic-alloy expertise – Inconel, Monel, Super Duplex, titanium and nickel alloys machined daily.
Single-source convenience – machining, heat-treat, coating, NDT and assembly organised under one purchase order.
Audit-ready quality – ISO 9001 principles, full traceability, FAIRs and CMM data supplied with every shipment.
What we deliver
CNC Turning & Mill-Turn
Ø 10 – 500 mm, up to 3 m long, live-tooled features in one hit
CNC Milling & Drilling
1 200 × 700 × 600 mm envelope, 4-axis rotary, probing in-cycle
abrication & Machined Weldments
Prep-machining, coded welding, post-machining, NDT
Assembly & Test
Press-fit, thread-locking, helium-leak or pressure tests to spec
Finish & Logistics
Vacuum heat-treat, plating, painting, global sea/air freight
How our subcontract route works
Feasibility & fixed quote
You send the drawing or model; we confirm alloy, finish and delivery.
Launch & schedule
capacity locked in; live progress updates via your chosen portal or weekly email.
Material & tooling
we source certified material, program CAM and set tooling before your order hits the machine.
Production & verification
in-process probing keeps dimensions tight; SPC data logged automatically.
Finishing & paperwork
sub-contract heat-treat, plating or NDT coordinated, with certs collated.
Pack & dispatch
parts labelled to your goods-in format, shipped worldwide on tracked services.
Industries We Serve
Oil & gas | Petro-chem | Sub-sea
Steel & non-ferrous extrusion
Power generation & renewables
Specialist automotive & motorsport
Defence & security equipment
Scientific instrumentation
Frequently Asked Questions
What is your typical lead-time?
Prototypes and urgent spares can ship in 48–72 hours (material dependent). Standard production runs leave in 2–4 weeks.
Can you work to my quality system?
Yes. We supply FAIRs (AS9102 if required), PPAP, EN 10204 3.1/3.2 certs and customer-specific documentation packs.
Is there a minimum order quantity?
No MOQ. We’re set up for true one-offs as well as ongoing call-offs and schedule orders.
How do you protect my IP?
NDAs are routine; restricted-access servers, controlled print runs and encrypted file storage keep your data secure.
Will I get real-time order updates?
We can provide weekly progress emails, share a live spreadsheet, or integrate with your MRP—whatever fits your workflow.
What happens if a tolerance is missed?
In-process probing flags any drift immediately; corrective actions are taken before the part leaves the machine, and deviations are recorded in the inspection report.