Supplier Spotlight: Bach Tung Co., Ltd. — Dual CMM + VMM Inspection, CNC Milling, Turning & Laser Engraving
April 6, 2026 · 10 min read
Part of our Supplier Spotlight series — real factory visits, real photos, no stock images. 179+ audited factories in the DEWIN Vietnam network.
179+
Audited Factories
50-pt
Dolphin Audit
16+
FTAs Available
For global buyers sourcing CNC machined components through trade directories or industry trade fairs, the core challenge isn't finding factories — it's verifying them. Any factory can present a capability list. What you can't confirm from a catalogue is whether their dimensional inspection equipment is real, operational, and capable of producing the documentation your quality system requires.
This is Supplier Spotlight #15 in our ongoing series — real site visits, real photos, no anonymous listings, no stock photography. Today's factory: Bach Tung Co., Ltd. — a Vietnam-based CNC precision machining operation with an unusually strong metrology suite verified on-site by our Dolphin Audit team: 3D CMM + 2D VMM + flatness meter, plus CNC milling, CNC turning, laser engraving, and a structured defective goods segregation system.
Previous spotlights: Bueno Technology, Altop Die Casting, NAPEC CNC, HDP (CNC + VMM), Minh Quang, Eguchiseiko, Hirata, Huynh Duc (3D CMM), Lidovit Fasteners, Ming Chuan, Lac Hao, Kinzoku, Kobayashi Casting, Shin Yi Valves.
✅ Dolphin Audit Verified — Above-Average Metrology for Factory Scale
Bach Tung's inspection suite — 3D CMM + 2D VMM + flatness meter + dedicated defective goods area — scores above average in Pillar 3 (Quality Systems) of our 50-point Dolphin Audit. This combination supports CMM-backed FAI reports, VMM profile inspection, and flatness validation for sealing surfaces — rare at this factory scale in Vietnam.
Why Dual Metrology (CMM + VMM) Is a Rare Signal
When DEWIN's audit team visits a Vietnam CNC machining factory, Pillar 3 — Quality Systems — reveals the most variation. Most factories have hand gauges. Better ones add a 2D VMM. Best-in-class for documentation-intensive programs have a 3D CMM. Bach Tung has both — plus a flatness meter.
3D CMM
- • Contact-probe dimensional measurement
- • GD&T: position, concentricity, runout
- • Traceable FAI / PPAP reports
- • Cpk process capability data
2D VMM
- • Non-contact optical measurement
- • Profiles, hole patterns, contours
- • Fast — suited to 100% inspection
- • Minimal setup vs. CMM
Flatness Meter
- • Surface flatness deviation
- • Gasketed interfaces, mating faces
- • Sealing surfaces, flanges
- • Flatness tolerance documentation
Factory at a Glance
Country
Vietnam
Factory Type
CNC Precision Machining (Multi-Process)
Processes Verified
CNC Milling, CNC Turning, Laser Engraving
Inspection Equipment
3D CMM + 2D VMM + Flatness Meter
Quality System Feature
Dedicated Defective Goods Segregation Area
Photos in DEWIN Network
8 real factory photos
Dolphin Audit Status
Verified — 50-point audit completed
FTA Export Markets
CPTPP, EVFTA, RCEP, UKVFTA + 12 more
The Inspection Suite — Photo by Photo
3D CMM and 2D VMM in Bach Tung's dedicated inspection zone — both verified operational during our on-site audit visit.
Flatness meter — for mating surface validation, sealing face inspection, and structural component flatness verification.
Dedicated defective goods area — physically labeled zone for non-conforming parts. Prevents mixing with conforming stock, enables root cause traceability.
What a Defective Goods Area Tells You About a Factory
One of the most revealing signals in our 50-point audit isn't the most expensive piece of equipment — it's whether a factory has a defined, physically labeled area for segregating non-conforming parts. Bach Tung has one. What this indicates:
- Non-conforming parts are physically separated — preventing accidental shipment of defective product
- The factory has a non-conformance process: ID → segregation → root cause → disposition — required for PPAP Levels 3–5
- Inspection results drive action — a factory that measures but doesn't segregate is only half-way there
- Quality management culture where operators are empowered to flag issues rather than pass them downstream
Production Floor — Machines Verified On-Site
CNC milling and CNC turning machines — confirmed operational during Dolphin Audit visit.
In-house laser engraving — supports lot traceability, COO marking, serialization, and OEM identification requirements.
Finished precision machined components from Bach Tung's production floor.
50-Point Dolphin Audit — Bach Tung Results
| Pillar | What We Verified On-Site | Result |
|---|---|---|
| 1. Facility & Safety | Organized layout, workshop overview, material flow | ✅ Pass |
| 2. Equipment & Capacity | CNC milling, CNC turning, laser engraving — all confirmed operational on-site | ✅ Pass |
| 3. Quality Systems | 3D CMM + 2D VMM + flatness meter + defective goods area — above average for scale | ✅ Pass — Strong |
| 4. Workforce & Management | Active inspection culture, organized floor, quality systems enforced | ✅ Pass |
| 5. Export Compliance | Laser engraving for COO marking; Vietnam-origin manufacturing value-add confirmed | ✅ Pass |
FTA Coverage for Bach Tung-Sourced Components
Vietnam's 16+ Free Trade Agreements create significant market access advantages for global buyers sourcing through Bach Tung:
CPTPP
Trans-Pacific Partnership
Preferential rates to Australia, Canada, Japan, Mexico, New Zealand, Singapore + others. Certificate of Origin Form CPTPP required.
EVFTA
EU-Vietnam Free Trade Agreement
Preferential rates on manufactured goods to all 27 EU member states. EUR.1 Movement Certificate or REX origin statement.
RCEP
Regional Comprehensive Economic Partnership
Preferential access across ASEAN + China, Japan, South Korea, Australia, New Zealand. Largest FTA by trade volume globally.
UKVFTA
UK-Vietnam Free Trade Agreement
Preferential rates for manufactured goods to the United Kingdom. Replaced EVFTA UK coverage post-2021.
How to Source from Bach Tung Through DEWIN
Submit Your RFQ
Share your drawings, material specifications, quantities, and any FAI or PPAP documentation requirements.
Factory Match & Audit Summary
DEWIN shares the Dolphin Audit summary — photos, equipment list, pillar scores — before you commit.
First Article & CMM Report
Bach Tung produces first article samples. Our on-ground team conducts FAI including CMM dimensional report and material certification verification.
FTA & COO Documentation
DEWIN coordinates Certificate of Origin documentation for CPTPP, EVFTA, RCEP, or UKVFTA as applicable. Laser engraving applied in-house.
Pre-Shipment Inspection
On-ground inspection before every production run ships. Issues are resolved at factory, not at your receiving dock.
Ongoing Program Management
DEWIN manages production monitoring, quality records, and re-audit scheduling. Dedicated account contact throughout.
Frequently Asked Questions
What makes Bach Tung's metrology suite stand out?
Most Vietnam CNC factories at this scale have hand gauges and possibly a 2D VMM. Having both a 3D CMM and 2D VMM plus a flatness meter is uncommon. The combination enables FAI-level dimensional reporting (CMM), fast profile screening at volume (VMM), and surface flatness validation (flatness meter) — a complementary suite rather than a single tool.
What FTA preferential rates apply to Bach Tung-sourced machined parts?
Vietnam-origin CNC machined parts qualify for preferential tariff rates under CPTPP (Australia, Canada, Japan, Mexico, New Zealand, Singapore +), EVFTA (27 EU member states), RCEP (China, Japan, South Korea, Australia, New Zealand + ASEAN), and UKVFTA (UK). FTA eligibility requires Certificate of Origin documentation — DEWIN manages this as part of our standard process.
Can Bach Tung support FAI and PPAP documentation requirements?
Yes. Their 3D CMM enables CMM-backed dimensional inspection reports compatible with PPAP Level 2 and above. The defective goods segregation system demonstrates the non-conformance management process required for higher PPAP levels. DEWIN coordinates FAI documentation and on-ground first article inspection on your behalf.
What types of machined parts is Bach Tung best suited to produce?
Precision turned components (shafts, bushings, fittings), CNC milled housings and brackets, components requiring laser engraved COO or lot markings, sealing surfaces requiring flatness validation, and FAI/PPAP-required programs where CMM-backed dimensional reports are critical.
Source from Bach Tung — CMM Inspection Verified, 16+ FTAs
Request a factory introduction. We'll share the Dolphin Audit summary, 8 real factory photos, equipment list, and FTA documentation guidance for your target markets.