Zhuohang Precision Machining FactoryMachining Services Supplier

Defense Machining Services

A corner of a Zhuohang CNC milling workshop in Dongguan, China.

Defense Machining Services — This page sets out what that claim has to be backed by — and the checks that. Tolerances: ±0.003 mm milling, ±0.002 mm turning — ISO 9001 / IATF 16949 verified.

Every supplier site claims to be a custom. This page sets out what that claim has to be backed by, and the checks that cost you nothing to run before you commit.

The shop behind this defense guide — verified and quotable in one exchange

This guide's facility holds 100+ CNC machines across a 6,800 m² plant at No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470. Machines include the Mazak VARIAXIS I-600 five-axis, INTEGREX I-250H S mill-turn, TSUGAMI B0206-III/B0205-III and STAR SR-32JII / SR-32J Type N Swiss lathes, Citizen Cincom A20-3F7, 3-, 4- and 5-axis milling and turning centres, 5+ Sodick AQ535L wire EDM machines and a Hexagon CMM bench with 20+ gauges.

Tolerances held: ±0.003 mm milled, ±0.002 mm turned, and ±0.002 mm ground or wire-cut, verified on a Hexagon CMM with the 10:1 gauge rule on every feature. Capability indices: Ppk ≥ 1.67 initial, Cpk ≥ 1.33 in production, on key characteristics. Certifications: ISO 9001:2015 (116024/A/0001/UK/En), IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded, disclosed openly), ISO 14001:2015 (116024/B/0001/UK/En), issued to Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005). Service area: 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 — based in China, delivering worldwide. Email Felipe Iglesias at [email protected] or +86 13126536955 to open a quote, and request the certificate numbers, the machine list and a past CMM report in the same message.

Routing decision — the machine that fits the part, not the machine that is free

The routing decision on a CNC part is the decision that sets the cost and the tolerance, and if you ask for the routing in the quote, you see which machine the part runs on. A flat plate with features on one face is a 3-axis part; a part with features on four faces is a 4-axis part; a part with compound angles or contoured surfaces is a 5-axis part. A long, slender rotational part is a Swiss-type part; a part with turned and milled features at compound angles is a mill-turn part. The part decides the machine, and the machine sets the hourly rate and the setup count. The facility behind this guide runs 3/4/5-axis milling at ±0.003 mm, Swiss-type turning at ±0.002 mm on TSUGAMI B0206-III and B0205-III, STAR SR-32JII and SR-32J Type N, and Citizen Cincom A20-3F7, and mill-turn on a Mazak INTEGREX I-250H S with B-axis and sub-spindle, so the routing is matched to the geometry, not forced onto whatever machine is free.

The setup count is the other lever. A part that runs complete in one setup has one first-article; a part that moves between three machines has three. The setup cost is amortised across the volume, but on a prototype or low-volume run, the multi-setup part is roughly double the setup cost of the one-setup part. The tolerance bands — ±0.003 mm milling, ±0.002 mm turning and grinding — are held on Hexagon CMM with Ppk ≥ 1.67 initial on key characteristics and Cpk ≥ 1.33 in production, under ISO 9001:2015, IATF 16949:2016 (design clause 8.3 excluded), and ISO 14001:2015, on 100+ CNC machines at 6,800 m² in Dongguan. Send the drawing to Felipe Iglesias at [email protected] or +86 13126536955, and ask for the routing, the setup count, and the first-article count in the quote.

Tolerance and the process chain — the band and the evidence

your tolerance question is a process question, not a number. The ±0.003 mm milling and ±0.002 mm turning and grinding bands are held by the machine, the fixture, the tool, the environment, and the inspection — a chain the shop can describe and you can audit. The facility behind this guide runs 100+ CNC machines including Mazak VARIAXIS I-600, Mazak INTEGREX I-250H S, TSUGAMI B0206-III and B0205-III, STAR SR-32JII and SR-32J Type N, and Citizen Cincom A20-3F7, with Hexagon CMM verification and the 10:1 gauge rule. Ppk ≥ 1.67 initial on key characteristics and Cpk ≥ 1.33 in production are reported with the band and the algorithm. Under ISO 9001:2015, IATF 16949:2016 (design clause 8.3 excluded), and ISO 14001:2015. Contact Felipe Iglesias at [email protected] or +86 13126536955 for the band and the evidence.

In brief
  • Exports to 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 — based in China, serving customers worldwide.
  • Dongguan Zhuohang Ltd (Registration No. 91441900MA4UWT6X39), operating as Zhuohang Precision Machining Factory, established 2005.
  • What "custom" actually obliges the shop to do — The common failure is a shop that quotes custom work but runs it as a variant of something it already makes.
  • Build-to-print: the plant cuts to your drawing and reports against it.

What does "custom" actually commit a supplier to?

Custom work means the process is designed around your part rather than pulled off a shelf: fixture design, tool selection, and a first-article inspection plan that did not exist before your drawing arrived. That design work is the real content of a custom quote, and it is why the first article costs more than the hundredth.

The common failure is a shop that quotes custom work but runs it as a variant of something it already makes. The result is a part that meets the drawing in most dimensions and misses in the one that mattered.

The tell is in the questions you get back. A shop that will really build a process asks about function. What the feature does, what it mates with, what happens if it is at the limit of tolerance. A shop that will adapt an existing process asks only about quantity.

How much capacity sits behind it?

a floor of 100-plus 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.

Three things that change the price without changing the part

Custom work means the fixture and the process are designed for your part, so the design decisions that matter are the ones affecting fixturing: a stable clamp face, a repeatable datum, and features that can be reached without a special-angle setup. Those three determine whether the fixture is simple or expensive.

This belongs in the quote discussion, not the first-article review, because the changes are usually trivial on the drawing and significant on the machine.

Which standards the plant is certified to

Three certificates, each with a number you can check with the registrar: 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).

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: the plant manufactures to your design, it does not originate the design.

What tolerance applies?

±0.003 mm on CNC milling, ±0.002 mm on CNC turning; ±0.002 mm where precision grinding or wire EDM is used, agreed per feature during quoting.

What identifies the legal entity behind the machines?

The legal entity behind this site is Dongguan Zhuohang Ltd, founded 2005 and registered in China under Social Credit Code 91441900MA4UWT6X39, marketing under the name Zhuohang Precision Machining Factory. Its registered and production address is No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470.

Use the National Enterprise Credit Information Publicity System and the 18-character code to verify a Chinese manufacturer. Trading companies can produce a business licence too, yet the scope reads trading rather than manufacturing and the address is an office, not a plant.

What should you check before trusting any machining services supplier?

Whether you buy from this plant or another, these checks separate a real floor from a brochure. None of them require a purchase order.

  • Is the fixture designed for this part or adapted from another? Ask for it in writing.
  • Is there a written first-article inspection plan? Ask for it in writing.
  • Who signs off the process before production starts? Ask for it in writing.
  • What happens to tooling if you re-source later? 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. Every step can go wrong in its own way, and the expensive ones are the first and the last. 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.

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). Used on 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). Used on 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). Used on 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). Used on shafts, bushings, flanges up to ±0.002 mm.
  • Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Used on 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.

Not sure this is the right process?

Send the model and the drawing and get a straight answer on whether this route is the right one, including where a design change would cut cost. Reach Felipe Iglesias at [email protected] or +86 13126536955.

Frequently Asked Questions

Which markets do you export to?

In short, 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. Our service area also spans Europe, the Americas, Asia, Oceania and Africa — based in China, we serve customers worldwide.

How quickly can you quote machining services?

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 machining services?

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.

Is inspection documentation included in the quote?

It should be stated explicitly. A first-article report is a document someone has to produce, and whether it is a full dimensional report or a sample plan changes both the cost and what you receive.

How are parts packed for export?

Each part is packed to spec — finished surfaces individually bagged and boxed, steel given corrosion protection. Packing belongs in the quote: it affects the cost and the condition the parts arrive in.

Can I audit the factory before placing an order?

Yes. On-site visits and video audits are welcome at No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470.

Do you sign NDAs before reviewing drawings?

Yes. Sign an NDA before files are exchanged; drawings are kept in the quoting system, not circulated by email.

Defense Machining Services — Related Pages

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Standards referenced on this page

  • ASTM A582/A582M-12 — Standard Specification for Free-Machining Stainless Steel Bars
  • ASTM B209/B209M-21 — Standard Specification for Aluminum-Alloy Sheet and Plate
  • ISO 9001 — Quality management systems — Requirements