- MOQ 1 piece — prototypes, one-offs, and production runs are all accepted.
- Lead time ~3 / 7 / 30 days depending on part complexity and the number of process steps. ±0.003 mm CNC milling, ±0.002 mm CNC turning; ±0.002 mm grinding, with Ppk ≥ 1.67 at the initial study on key characteristics and Cpk ≥ 1.33 on general characteristics. Capability is reported per characteristic: every report names the feature, its tolerance band, the sample size, the sigma method, and the study window.
- Registration 91441900MA4UWT6X39 — the first thing to confirm in diligence.
How do you qualify a machining supplier before ordering?
How do I start diligence on a machining supplier in China?
Start with the entity, not the price: confirm the registration number, verify the certificate numbers with the registrar, request the machine list, and ask for tolerance evidence from a real job. A genuine manufacturer answers all four in a single exchange, and the response pattern tells you whether you are dealing with a factory or a broker.
What is the registration number of this factory?
The legal entity is Dongguan Zhuohang Ltd, registration number 91441900MA4UWT6X39, at No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470. The number is checkable against the company name and address, which is the first confirmation in the diligence checklist.
What are the minimum order and lead time?
What is the minimum order quantity?
The MOQ is 1 piece. Single-part prototypes and one-off repairs are accepted the same as production runs, so you can validate a design before committing to volume and reorder only what you actually need, without clearing a minimum that inflates your first order.
What are the lead times?
Roughly 3, 7, or 30 days, set by part complexity and the number of process steps rather than a blanket promise. Simple parts ship in about 3 days, while parts running 10–20 process steps or needing surface finishing fall into the longer 30-day tier.
What tolerances and materials are available?
What tolerances can you hold?
±0.003 mm on CNC milling, ±0.002 mm on CNC turning, and ±0.002 mm for precision grinding, verified on Hexagon CMMs. On a representative length characteristic the process showed Cpk 1.851 (one characteristic on one part, not a blanket capability claim) against an initial-study target of Ppk ≥ 1.67 on key characteristics and a production target of Cpk ≥ 1.33.
Read the tolerance band before you read the index. Cpk is a ratio of the tolerance band to the process spread, not an absolute measure of accuracy. The figure above was recorded on a length characteristic with a 0.4 mm band (76.1–76.5 mm) — wide by design. Hold the same process spread against a ±0.005 mm feature and it fails outright. Ask for the band, the subgroup count and the sampling window on every capability number a supplier quotes.
Which materials do you machine?
Aluminum, stainless steel, carbon and alloy steel, brass, copper, titanium, and magnesium, plus engineering plastics such as ABS, POM, nylon, PTFE, and PEEK. Every incoming lot is XRF-checked against its mill certificate, so the alloy you specify is the alloy that reaches the spindle.
Which certifications and documents come with the parts?
What certifications do you hold?
ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En), and ISO 14001:2015 (116024/B/0001/UK/En), all issued by URS. The IATF 16949 scope excludes product design under Clause 8.3, so the shop operates as a build-to-print manufacturer.
What documents ship with the parts?
Depending on the program, a first-article inspection report, a CMM dimensional report, SPC control charts, and the material certificate can ship with the parts. You receive documented evidence of what was measured and verified, rather than a pass-or-fail note.
How do quotes, payment, and shipping work?
How do I get a quote?
Email your STEP or IGES model and a 2D drawing to [email protected], with the material, quantity, and any finishing requirement. You receive a design-for-manufacturing review and a quote, usually within one business day, with any tolerance or geometry issues flagged before you commit.
What payment terms do you accept?
Bank transfer (T/T) or letter of credit (L/C), typically a 30–50% deposit with the balance before shipment or against a copy of the bill of lading. Terms are negotiable depending on order size and your company's history, and they are settled before the first chip is cut.
How is shipping handled?
You can ship on your own DHL, FedEx, UPS, or TNT account, or freight can be arranged and included in the quote. Packaging follows your specification, and a weekly order report keeps you posted on progress from release through dispatch.
What happens if a part is out of spec, and can you visit?
What happens if a part arrives out of spec?
Send photos of the issue and the failed parts are remade, with the remake and return shipping cost covered. Because every lot is traceable to material, machine, operator, and inspection data, the root cause is isolated rather than guessed at.
Can I visit the factory before I order?
Yes. The plant is a 6,800 m² facility in Hengli Town, Dongguan, with 100+ employees and 100+ production machines. A visit lets you audit the machine list, the XRF incoming checks, a sample CMM report, and the quality-system records in person before you commit.
If you are still comparing suppliers, these five questions separate a manufacturer from a trading desk, and they apply to every shop you contact, including this one.
- Can they show the actual machine list? A manufacturer names models and counts; a trading company recycles brochures.
- Do the tolerances come with measurement evidence? Ask for a CMM report or SPC chart from a real job, not a capability paragraph.
- Is the certificate number verifiable with the registrar? Real ISO and IATF certificates carry numbers you can look up.
- Who owns the secondary operations? If anodizing or heat treatment is outsourced, the shop should say so and name the partner.
- Is the design review honest? A shop that flags DFM problems before quoting saves you more than one that agrees to everything.
Which materials and industries do you cover?
We machine aluminum, stainless steel, titanium, brass, copper, and Inconel, plus engineering plastics including PEEK and Delrin. These machined parts go into medical, aerospace, automotive, robotics, electronics and defense applications, with the inspection, traceability and documentation each sector requires before it places an order.
What buyers ask most
Three questions come up on nearly every enquiry. What is the minimum order? One piece - a single prototype can be machined, checked and iterated before any volume is committed. What is the lead time? Roughly 3 / 7 / 30 days depending on the material and the documentation scope, from a simple aluminium part to a full first-article package. What tolerances can you hold? ±0.003 mm milled and ±0.002 mm turned, verified on a Hexagon CMM, with Ppk 1.67 or better initial and Cpk 1.33 or better in production on critical characteristics. The answers are short because the capability is specific, not vague.
The answers behind the answers
The plant behind these answers is Dongguan Zhuohang Ltd - 6,800 m² in Hengli Town, Dongguan, 100+ CNC machines including Mazak VARIAXIS I-600 and INTEGREX I-250H S, and certification to ISO 9001:2015, IATF 16949:2016 and ISO 14001:2015 with the certificate numbers published and verifiable. The service area covers 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 shipping from Dongguan. Contact Felipe Iglesias at [email protected] or +86 13126536955 with a drawing and a quantity for a specific answer to your specific part.
The evidence behind the numbers
Ask for proof and the answer is specific: Dongguan Zhuohang Ltd runs 100+ CNC machines on a 6,800 m² floor in Hengli Town, Dongguan, including the Mazak VARIAXIS I-600 five-axis, the INTEGREX I-250H S mill-turn, Brother SPEEDIO, and TSUGAMI, STAR and CITIZEN Swiss lathes. Inspection runs on a Hexagon CMM with the 10:1 gauge rule, and ISO 9001:2015, IATF 16949:2016 and ISO 14001:2015 are held by verifiable certificate number. Critical characteristics are tracked with Ppk 1.67 initial and Cpk 1.33 in production - a tolerance quoted here is a tolerance held.
Buyers across 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 are served from Dongguan with worldwide shipping. MOQ is 1 piece; lead times run about 3 / 7 / 30 days. Send the drawing and quantity to Felipe Iglesias at [email protected] or +86 13126536955 and the quote returns with the process spelled out.
Starting your order
The quickest route to a part is a model and a quantity. Send the STEP or IGES file with a 2D drawing that names the tolerances, datums, material grade and finish, plus the quantity and the lead time you need, and you get an itemised quote - material, setup, cycle time and inspection - not a round figure. No finished drawing? Send what you have and the questions that are blocking you; the goal is to begin, not to wait for a flawless package.
Email Felipe Iglesias at [email protected] or call +86 13126536955. MOQ is 1 piece, lead times run roughly 3 / 7 / 30 days, and shipping covers Europe, the Americas, Asia, Oceania and Africa, plus worldwide from Dongguan.
The tolerance and finish numbers
On this floor milling holds ±0.003 mm, turning ±0.002 mm, and grinding or wire EDM ±0.002 mm, verified on a Hexagon CMM against the drawing datums. As-milled surfaces run Ra 0.8 to 3.2 µm, ground Ra 0.2 to 0.4 µm, polished Ra 0.05 to 0.1 µm. Every feature follows the 10:1 gauge rule - the measuring instrument resolves ten times finer than the tolerance it checks. A part is only as good as its datum, so the same callout against two different datums makes two different parts; name the datum and the geometric convention, ASME Y14.5 or ISO.
De-risking a first order
A trial order of a few pieces is the cheapest insurance you can buy — it proves the routing, the tolerance and the paper trail on a small batch before the volume order locks in. One floor, one quality system, one accountable party, whether the run is a single part or a full production lot, so what the trial confirms is what production repeats.
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). Geared to 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). Geared to 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). Geared to 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). Geared to shafts, bushings, flanges up to ±0.002 mm.
- Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Geared to 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.
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.
Have a question not covered here?
Email your drawing and question to [email protected] or call +86 13126536955 — a specific question gets a specific answer.
Standards referenced on this page
- ASTM B211/B211M-19 — Standard Specification for Aluminum-Alloy Rolled or Cold Finished Bar, Rod, and Wire
- ASTM B348/B348M-21 — Standard Specification for Titanium and Titanium Alloy Bars and Billets
- ISO 9001 — Quality management systems — Requirements