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Machined Parts Inspection
Shafts, housings, brackets, fittings — we measure your parts at the factory, against your drawing, before they ship. A hole that is 0.015 mm out of round is still your problem once the container lands.
CNAS-accredited to ISO/IEC 17020
ISO 9001:2015 quality system
Serving importers since 2006
48hInspector on-site at the factory after booking
24hPhoto-documented PDF report after the inspection
0Critical defects permitted under the default AQL criteria
2006The year we started inspecting for importers
What We Check on a Machined Parts Order
Everything is measured against your drawing, your PO and your approved sample — not the factory's word.
Dimensions & tolerances
Critical dimensions measured with calipers, micrometers and pin gauges. Every dimension you list on the drawing gets a measured value in the report.
Threads & fits
Go/no-go gauges on threaded holes and shafts. An M4 thread either takes the go end smoothly or it fails — there is no middle answer.
Material grade
A handheld XRF analyzer reads the alloy on the spot. Real 304 stainless shows 18–20% chromium and at least 8% nickel — anything less is not 304.
Surface & coating
Plating, anodizing and coating checked for uniform coverage, scratches and peeling. Where rust is the risk, salt-spray results get reviewed against your spec.
Workmanship
Burrs, sharp edges, dents, tool marks and chatter. The things a customer's fingers find before their eyes do.
Quantity & packing
Piece counts against the PO, rust-prevention packing, carton condition and shipping marks.
Machined Parts We Inspect
If it comes off a lathe, a mill or a die-casting machine, we can inspect it.
CNC turned & milled partsShafts, pins, bushings, housings, flanges and spacers
Fasteners & hardwareScrews, bolts, nuts, washers, rivets and anchors
Die-cast & extruded partsHousings, frames, brackets and heatsinks
Fittings & assembliesPipe fittings, valves, hinges, latches and hardware sets
When This Inspection Pays for Itself
First order with a new shopYou have a drawing and a promise. The inspection tells you which one the parts actually follow.
Repeat order after a quality slipLast batch came with burrs or short counts. This time someone counts and measures before you pay.
Before the balance paymentThe goods are finished and mostly packed. You get a pass or fail answer while they are still at the factory.
After rework or a tooling changeThe factory says the problem is fixed. We confirm the fix and check that nothing new broke.
Defects We Catch Before You Pay for Them
Real findings from real inspections. Cheap to fix at the factory, expensive to fix after arrival.
Cheap steel sold as good steelAn XRF reading of 1.2% nickel and 9.5% manganese means 201 stainless dressed up as 304. It rusts — and your brand takes the blame.
Threads that seize on assemblyThe go end must thread fully with 0.5 N·m of torque. The no-go end must stop within two turns. Both ends get checked on every sampled hole.
Rust after the salt sprayPlated hardware sits 48 hours in 5% brine at 35°C. Red rust over 0.5 mm or peeling over 5% fails the batch. One supplier lost 200,000 screws this way.
Holes out of roundA mounting hole with 0.015 mm cylindricity deviation pushed process capability below Cpk 1.33. All 5,000 parts were red-tagged and quarantined.
Dimensions measured on a hot floorA 100 mm aluminum shaft grows 0.0023 mm for every degree of temperature change. Precision parts need controlled measuring conditions.
Burrs and sharp edgesSmall enough to pass a glance, big enough to cut a hand or score the mating surface the part slides against.
Plating that peelsCoating checked for uniform coverage and adhesion — not just shine under the factory lights.
Short countsPieces counted against your PO — not against the packing list the factory wrote.
On-Site Checks with Real Numbers
Go / No-Go
Thread gauges
Both ends of the gauge decide the result — never a look at the threads.
45 s
XRF alloy reading
Elemental composition to 0.01%, read in front of the goods.
48 h
Salt-spray evidence
5% brine at 35°C. Red rust over 0.5 mm or peeling over 5% fails.
H7
Hole & shaft fits
Fits checked against the tolerance class printed on your drawing.
±0.5 °C
Measurement discipline
Precision readings need stable temperature. A hot factory floor moves metal.
100%
Drawing coverage
Every critical dimension on your drawing gets a measured value in the report.
Test values come from our working instructions. If your approved spec says something different, your document wins.
When On-Site Checks Are Not Enough
Some answers need a laboratory. We coordinate the testing — the lab issues the report.
Plating & coating thicknessMeasured properly, not estimated by eye under factory lights.
Salt spray & corrosionRun for the hours and acceptance limits your spec calls for.
Food-contact & migrationFor parts that touch food, scoped to your market — see food contact testing services.
Restricted substancesRoHS, REACH and similar screening through our lab testing team.
The lab report comes from the laboratory. Our job is to get the right sample there with the right instructions.
Sampling to ANSI/ASQ Z1.4 (ISO 2859-1)
We sample by the standard US and EU buyers know. Bigger lots get bigger samples, and the report states exactly how many units each check covered. See the ANSI sampling tables and our defect classification guide.
Your criteria can replace the defaults on any order. Send your own checklist, your defect history and your AQL — we inspect to your documents.
0
Critical
Wrong material in a load-bearing part, sharp edges that cut — one critical finding fails the lot.
2.5
Major AQL
Out-of-tolerance dimensions, seized threads, failing plating — problems that stop the part working or selling.
4.0
Minor AQL
Small cosmetic marks on non-functional surfaces that don't affect fit or use.
Your Supplier's Machine Vision Is Not Your Inspection
Cameras and CMMs on the supplier's floor answer to the supplier. Owning the equipment is not proof it is set up, calibrated — or even switched on for your batch.
What we review
When automated inspection records sit inside the agreed scope, we look at calibration status, reference samples and the OK/NG criteria — against your drawing.
What we don't do
We don't certify AI models or validate proprietary algorithms. We check parts against your specification.
What you get
An independent answer from full-time UTS engineers, with photos and measured values you can forward to your customer.
Buying From a New Machining Supplier?
The inspection checks the parts. A supplier assessment checks the shop that makes them.
Fixture wearA positioning pin worn past 0.05 mm lets parts shift during milling. We ask for the fixture life-cycle log.
Spindle truthA 12,000 RPM rating gets verified with a tachometer — not read off the display.
Tool-holder runoutPast 0.003 mm of radial runout on a BT40 holder, the Ra 0.8 surface finish you paid for is gone.
Calibration budgetOne shop cut annual CMM calibration from 80,000 to 15,000 RMB. Measurement error grew from 0.002 to 0.01 mm — and 1,200 precision parts a month faced rejection.
These checks live inside a factory evaluation — book one before you wire the deposit. Read more: what a supplier assessment covers.
Booking Takes One Email
Send your documents
PO, drawings with tolerances, approved spec, sample photos, packing artwork and barcode list.
We confirm the checklist
Our office reads every document, prices the job per inspector-day, and asks you first when anything conflicts.
Inspector on site
A full-time UTS engineer runs the checklist at the factory and photographs everything.
Report and decision
You get the PDF report with photos within 24 hours and decide: ship, rework or reject.
What Happens on Inspection Day
ArrivalThe engineer checks in at the factory, confirms the lot size and pulls the samples the AQL plan calls for.
Opening cartonsPieces get counted, packing gets checked, samples spread out on the workbench.
MeasuringCalipers, micrometers, pin gauges and thread gauges come out. Every critical dimension on your drawing gets a number.
TestsXRF reads the alloy. Surface, coating and fit checks follow your spec.
Photo recordEvery defect is photographed up close. Every test result is written down.
ReportPass, fail or hold — the PDF is in your inbox within 24 hours.
Send Your Drawing and PO
Our office reads your PO, drawings, tolerance requirements and packing spec — then confirms the checklist with you before anyone enters the factory.
Good Parts, Bad Packing — Still a Problem
Machined parts travel with two enemies: impact and moisture. We check the packing the way a sea voyage will treat it.
Rust preventionVCI bags, anti-rust oil and desiccant checked against your packing spec. Bare steel in a plain carton arrives as rust.
Cartons & cushioningCorrugated strength, dividers and edge protection. Heavy parts need cartons that survive stacking.
Count vs POCarton counts, pieces per carton and pallet totals matched against your PO and packing list.
Marks & labelsShipping marks, handling marks and destination-language labels checked against your artwork.
Why it matters: a carton that stays closed is not a pass if the parts inside are rusted.
A Report You Can Act On the Next Morning
Lot size, sampled quantity, the AQL applied, every measured dimension, thread and material results, defect photos — plus anything that couldn't be checked, and why.
Clear pass / fail / hold result — release, rework or reject with evidence in hand.
Re-inspection after rework confirms the fixes before you ship.
An inspection does not replace certification or lab testing. We don't issue certificates, and the release decision always stays with you.
What It Costs
No hidden lines on the invoice. Here is the whole pricing logic.
Priced per inspector-dayOne inspector, one day, one factory. The rate depends on where the factory is and how much work your order needs.
No travel feesNo weekend surcharges either. The quoted inspector-day rate is the full cost.
Loading supervisionContainer loading supervision starts at $298 per day.
Sample evaluationA documented case ran about $300 — see the sample evaluation service.
Fast quoteSend your PO and factory address — the office replies within 2 hours on working days.
Exact numbers come with your order details. Every quote is confirmed in writing before anyone travels.
48 Hours to the Factory Floor
Full-time UTS engineers across China's manufacturing provinces and 13 Asian countries — the same people every time, not freelancers hired per job.
China13 provinces covered, from Guangdong to Shandong
Asia13 countries, including Vietnam, Thailand, India and Pakistan
One teamFull-time, university-educated engineers on staff
An Accredited Inspection Body, Not a Freelancer
UTS is accredited by CNAS against ISO/IEC 17020 — the international standard for inspection bodies — and runs an ISO 9001:2015 quality management system. We have been inspecting products for importers since 2006, with full-time, university-educated engineers on staff.
Brands That Book Our Inspectors
Importers, retailers and brands across the US and Europe use UTS for pre-shipment quality control.
Questions Buyers Ask Us
Does a machined parts inspection replace certification or laboratory testing?
No. A third-party inspection verifies that sampled parts match the buyer-approved specification, drawings and order requirements. It does not replace product design validation, certification, laboratory testing, or destination-market regulatory assessment, and UTS does not issue certificates or approve the use of certification marks.
Can you measure against my drawing and tolerances?
Yes. Send the drawing with your purchase order. Every critical dimension you list gets a measured value in the report, taken with calipers, micrometers, pin gauges or thread gauges as the feature requires. Where your tolerance standard differs from our defaults, your document wins.
Can I use my own checklist and AQL for a machined parts order?
Yes. ANSI/ASQ Z1.4 with General Inspection Level II is the default baseline, with Critical: none permitted, Major: AQL 2.5 and Minor: AQL 4.0. Buyer-approved checklists, defect histories and different AQL criteria can replace the defaults for the order.
Which on-site tests apply to my machined parts?
Tests are matched to the part, material and intended use. Typical items include thread go/no-go checks, XRF alloy verification, coating and plating checks, review of salt-spray results where corrosion is a risk, fit checks with mating components and a shipping-carton drop test where applicable.
How fast can an inspector get to the factory?
For major manufacturing areas in China and across Asia, an inspector is on-site within 48 hours of booking. The photo-documented PDF report follows within 24 hours of the inspection.
What happens if the inspection finds defects?
Defective samples are labeled, photographed and classified as critical, major or minor in the report. The buyer decides on rework, acceptance of deviations or rejection, and a re-inspection can be booked after the factory reworks the goods.
What do you need to book a machined parts inspection?
The purchase order, drawings with tolerances, approved specification, approved sample references, packaging artwork, barcode list and any buyer-defined test requirements. Where documents conflict, the office team obtains client clarification before the inspection.
How much does a machined parts inspection cost?
Inspections are priced per inspector-day and depend on the factory location and the workload of the order. There are no travel fees and no weekend surcharges. Send your purchase order, drawings and factory address for an exact quote.
Related Services Buyers Also Book
Same team, same booking process, same 24-hour report.
Final Random Inspection
100% made, 80%+ packed: random sampling of the finished parts to ANSI/ASQ Z1.4 — the pass or fail answer before you pay the balance.
About final random inspection
During Production Inspection
Output compared with the approved sample while the line is still running — drift caught before the whole batch is finished.
About during production inspection
Container Loading Supervision
Carton count, container condition, loading process and seal number — recorded on loading day, before the doors close.
About loading supervision
Sample Evaluation
The pre-production sample measured against your drawings, spec and packing files — before the bulk run starts.
About sample evaluation
Initial Production Inspection
First-off parts measured against the drawing while tooling, fixtures and machine settings can still be adjusted.
About initial production inspection
Factory Evaluation
Company details, production areas, equipment and real operating conditions checked on site — before you wire a deposit.
About factory evaluationRead Before You Book
Quality Control Inspection Checklist — What Experts Actually Measure
CMMs, go/no-go gauges, XRF and salt spray, with real numbers.
What Do Supplier Assessment Services Check? 3 Key Factors
Fixtures, spindles and calibration records on a machining shop floor.
Automated Quality Inspection — How Importers Review Machine Vision Data
How to read your supplier's machine-vision data without taking it on faith.
ANSI/ASQ Z1.4 Sampling Tables
Sample sizes and rejection lines for your lot size.
Defect Classification
What counts as critical, major and minor — and who decides.
Let's Check Your Next Machined Parts Order
Send your PO and drawings — we confirm the checklist with you, then send a full-time UTS engineer to the factory.
