- 6,800 m² across two buildings in Hengli Town, Dongguan. Production, inspection, and engineering under one roof.
- ISO 9001:2015 / IATF 16949:2016 / ISO 14001:2015 — certificate numbers published and verifiable.
- Whether the supply relationship survives a change in volume or specification — A supplier with one machine in the relevant family has a single point of failure.
- Build-to-print: the plant cuts to your drawing and reports against it.
What does "supplier" actually commit a supplier to?
The question to ask a supplier is not what it can make today but what happens when the order doubles, or when the drawing changes at revision C. Capacity questions are really questions about queue structure: how many machines sit in the family that makes your part, and how much of their time is already committed.
A supplier with one machine in the relevant family has a single point of failure. Depth in the same family is what lets a part re-route rather than queue when a machine is pulled for service.
Ask what share of the machine hours in your part's family is already committed. It is an unusual question and a revealing one: a supplier that cannot answer it does not know its own queue, which means the date it gave you was an estimate rather than a schedule.
Three things that change the price without changing the part
For a repeat part, the lever is stability rather than price: hold the revision, hold the material source, and hold the process. A supplier can usually improve a repeat part's cost once the process is settled, but only if the drawing has not moved.
This is cheaper to settle at quote time than once parts already exist, because the changes are usually trivial on the drawing and significant on the machine.
Which entity is responsible for the work?
Dongguan Zhuohang Ltd (Registration No. 91441900MA4UWT6X39, established 2005).
How much capacity sits behind it?
a hundred-odd machines with depth in every relevant family — 50+ three-axis, 20+ four-axis, 20+ five-axis, 25+ turning centres, plus Swiss-type, grinding, and wire EDM.
What do the certificates actually cover?
Three certificates, each with a number you can check with the registrar:
| Standard | Certificate number | Scope note |
|---|---|---|
| ISO 9001:2015 | 116024/A/0001/UK/En | Quality management system |
| IATF 16949:2016 | 131941/A/0001/SM/En | Automotive QMS. Excludes clause 8.3 product design |
| ISO 14001:2015 | 116024/B/0001/UK/En | Environmental management system |
The IATF 16949 certificate excludes clause 8.3 (product design). That is normal for a build-to-print manufacturer and it is stated here rather than left for an auditor to discover: we manufacture against your design, it does not originate the design.
Ppk and Cpk, with the stage named
For capability reporting, key and special characteristics start at Ppk ≥ 1.67 and run at Cpk ≥ 1.33 in production; general characteristics start at Ppk ≥ 1.33. Results are always quoted with the index, the stage, and the sigma estimator named, because VDA and AIAG use the same index names for opposite periods and quoting "Cpk 1.67" without that context is meaningless.
Values between 1.33 and 1.67 are conditional acceptance requiring customer review, not a pass. Stating that boundary is deliberate: a supplier that reports a number without its stage and its estimator has not told you whether the process was stable when it was measured.
How to verify a CNC precision machining supplier in an afternoon
Whether you buy from this plant or another, these checks separate a real floor from a brochure. None of them require a purchase order.
- Machine count in the specific family your part needs? Ask for it in writing.
- Second-source arrangement for outside processes? Ask for it in writing.
- How engineering changes are handled mid-production? Ask for it in writing.
- What happens to your slot when a larger customer expands? Ask for it in writing.
What happens between quote and first article?
Programming and offline verification, fixture design and build, material inward inspection, roughing, finishing, inspection, and the first-article report. Each stage has a way to fail, and the fixes that hurt most are the first and last steps. The manufacturability review is where cost is actually decided. A pocket depth reduced by a few millimetres, or an internal corner radius opened from 1 mm to 3 mm, cuts cycle time more than any change of machine, because it changes the tool that can be used.
Automotive CNC precision — the IATF 16949 discipline
Automotive-grade CNC precision parts require IATF 16949:2016 (not just ISO 9001) because the automotive supply chain runs on PPAP, APQP, MSA, and SPC. A shop with IATF 16949 (Dongguan Zhuohang Ltd, certificate 131941/A/0001/SM/En) has the documentation discipline a Tier 1 or Tier 2 automotive buyer requires. The IATF certificate states whether design (clause 8.3) is included — Zhuohang's excludes design, the honest scope for a machining-only shop. PPAP documents the part's capability before production: design record, engineering change, drawings, material certs, performance, process flow, PFMEA, control plan, MSA, dimensional layout, material test, performance test, qualified lab, appearance, sample parts, master sample, checking aids. APQP gates the part through five phases: plan, design, process, product, launch.
The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C inspection room, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.
Automotive run-at-rate — the production-volume verification
The run-at-rate is the verification that the CNC precision shop can produce the automotive part at the quoted volume, on the quoted cycle time, at the quoted quality. The run-at-rate: the shop runs a defined lot (often 300 pieces for automotive) at full production rate, documents the cycle time per part, the downtime, the scrap rate, the Cpk on key characteristics. The run-at-rate passes when the cycle time meets the quote, the scrap is below 1 percent (automotive threshold), and the Cpk is ≥1.33 on critical features. The PPAP ties to the run-at-rate: the PPAP package documents the part's capability, the run-at-rate documents the process's capability. A shop that produces both is one whose automotive parts will pass the customer audit; one that produces only the PPAP (without the run-at-rate) is one whose production volume is assumed.
The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.
Automotive PPAP submission levels — what each requires
The PPAP submission level matrix runs on five levels. Level 1: warrant only (the supplier signs a PSW, no parts or paperwork shipped) — for low-criticality. Level 2: warrant plus dimensional, material, and performance data — for medium-criticality. Level 3: warrant plus dimensional, material, performance, process flow, PFMEA, control plan, MSA, dimensional layout, material test, performance test, qualified lab, appearance, sample parts, master sample, checking aids — the default for new parts. Level 4: same as Level 3 plus engineering change. Level 5: full package plus customer-specific — for critical-safety. The IATF 16949:2016 discipline is what makes PPAP possible: the process is documented, the PFMEA is real, the control plan matches the PFMEA.
The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Felipe Iglesias +86 13126536955 [email protected] PT/EN/FR/ES/ZH/JP.
Automotive control plan — the production-run discipline
The automotive control plan is the document that describes how the CNC precision part is produced and inspected on the production run, and it ties to the PFMEA (process failure mode and effects analysis). The control plan's contents: the characteristic (every dimension, tolerance band, surface finish callout); the specification (the drawing's requirement); the evaluation method (the gauge, the CMM, the visual); the frequency (every piece, every 50th, every 100th, per setup); the responsibility (the operator, the inspector, the quality engineer); the reaction plan (what to do when the characteristic is out of tolerance — adjust, rework, scrap, escalate). A shop with a real control plan is one whose production runs are documented; one with a copy-paste template is one whose control plan does not survive a customer audit. Your filter: ask for a sample control plan on the RFQ; verify the plan matches the PFMEA.
Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Felipe Iglesias +86 13126536955 [email protected] PT/EN/FR/ES/ZH/JP.
What this shop actually runs
If you ask for capability evidence, you deserve a specific answer. This facility operates 100+ CNC machines across 6,800 m2 in Dongguan, China, staffed by 100+ people. The machines, listed by category:
- 5-axis machining centres (10+) - Mazak VARIAXIS I-600 (510/910/510 mm travel, 12,000 rpm, 22 kW, 71.6 N·m, 30-tool BT40) and Mazak INTEGREX I-250H S (B-axis 0.0001°, 24 kW, 124 N·m, 38-tool HSK-A63). Intended for compound-angle parts, single-setup multi-face prismatic work, and aerospace fittings where datum transfer loss is unacceptable.
- 3-axis / 4-axis machining centres (50+) - Brother SPEEDIO S500Z2N / S700Z2N (10,000 rpm, 14/21-tool ATC, 0.7 s tool-to-tool, Z-axis 2.2 G) and Mazak VCE-430A L / VCE-570C L (10,000 rpm, 118 N·m, 24-tool ATC). Intended for prismatic parts, plates, brackets, housings.
- Swiss-type turning centres (10+) - Citizen Cincom A20-3F7 (Φ20 mm, 10,000 rpm), TSUGAMI B0206-III / B0205-III (Φ20 mm, 0.1 µm), STAR SR-32JII / SR-32J Type N (Φ32 mm, 8,000 rpm). Intended for long, slender rotational parts at ±0.002 mm.
- CNC turning centres (20+) - HEADMAN T70M/1250 (720 mm swing, 117 mm bore, 3,000 rpm, BMT75 12-station turret). Intended for shafts, bushings, flanges up to ±0.002 mm.
- Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Intended for hardened tool steel, internal splines, sharp internal corners that milling cannot reach.
- Inspection: Hexagon CMM + 20+ gauges - Hexagon CMM for coordinate measurement, plus vision system, profilometer, hardness tester, coating thickness gauge, XRF for material verification. The 10:1 rule (gauge 10x more accurate than the band) is applied to every feature.
- Machine highlights - VARIAXIS I-600: one-setup multi-face 5-axis + MAZA-CHECK auto-calibration; INTEGREX I-250H S: DONE-IN-ONE mill-turn, B-axis 0.0001° + Ai thermal shield; SPEEDIO S500Z2N / S700Z2N: Z-axis 2.2 G + 0.7 s ATC; Swiss-type: guide-bush switchable + 0.1 µm resolution.
- Automotive routing - Brother M300X3 RD / M200X3 RD for EV motor housings and wheel bearings; SPEEDIO S500Z2N / S700Z2N for cylinder heads and crankcases; QT-COMPACT 200MSY L for shafts.
Tolerance bands: ±0.003 mm milled, ±0.002 mm turned, ±0.002 mm ground or wire-cut. Capability indices: Ppk >= 1.67 at the initial study; Cpk >= 1.33 ongoing in production.
Certifications: ISO 9001:2015 (116024/A/0001/UK/En) · IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded) · ISO 14001:2015 (116024/B/0001/UK/En), held by Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, since 2005).
Service area: we supply Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa, with worldwide delivery from China.
Contact: Felipe Iglesias, [email protected], +86 13126536955.
Ask the four questions before you commit
Registration number, machine depth, certificate numbers, and a walk of the floor. Contact Felipe Iglesias at [email protected] or +86 13126536955 — on-site and video audits are welcome.
Frequently Asked Questions
What materials do you machine?
Aluminum, stainless steel, titanium, brass, copper, and Inconel for metals; PEEK and Delrin (POM) for plastics. Material certificates are verified on incoming stock.
How is an engineering change handled mid-production?
The change is documented against a revision, the affected parts in process are identified, and the revised drawing is confirmed in writing before work restarts. The important part is that the revision in force at any moment is a single, written one.
How quickly can you quote cnc precision machining?
Quotes are returned with a manufacturability read rather than a price alone — where a tolerance or a feature will drive cost, that is flagged at quote stage rather than after the first article. Turnaround depends on drawing completeness.
What is the minimum order quantity for cnc precision machining?
There is no minimum. Prototype quantities are run on the same machines as production quantities, which is what makes a later ramp a schedule question rather than a re-qualification.
Do you hold stock or consignment for repeat orders?
On repeat orders, a forecast lets the shop hold material and, where justified, dedicated fixturing in readiness. It is a commercial arrangement rather than a standard term, worth raising at order two rather than order one.
Is your IATF 16949 certificate valid for design work?
No — clause 8.3 (product design) is excluded. The certification covers manufacturing to your design and the associated process controls, not originating design.
What files do you need for a quote?
Send a 3D model (STEP or IGES) plus a 2D drawing that names the tolerances, surface finishes, material spec and any inspection or certification needs. The drawing is the contract; the model alone typically leaves the tolerance scheme open.
Continue reading: 3 Axis CNC Precision Machining · 4 Axis CNC Precision Machining · 5 Axis CNC Precision Machining
Standards referenced on this page
- IATF 16949:2016 — Automotive quality management system standard
- ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
- ASTM B211/B211M-19 — Standard Specification for Aluminum-Alloy Rolled or Cold Finished Bar, Rod, and Wire