Thang Loi Import Export Trading Manufacturing
CNC Milling + Injection Molding + Assembly Under One Roof
Dolphin-audited Vietnam multi-process factory with CNC milling, injection molding, CNC lathe, and in-house assembly all confirmed operational on-site. One vendor for complete metal + plastic sub-assemblies serving global buyers.
Real Factory Photos — Dolphin Audit On-Site Visit
Taken by Dewin's on-ground team. CNC milling, injection molding, lathe, drill, and assembly all physically confirmed operational.
6 real on-site photos. All equipment photographed by Dewin's Dolphin Audit team — not marketing materials.
Why Multi-Process Under One Roof Is Rare and Valuable
Most Vietnam factories specialize in one process. A factory combining CNC milling, injection molding, lathe turning, and assembly gives global buyers something hard to find: complete sub-assembly capability with one quality system.
Single COO for Complete Assembly
All processes performed under one VCCI-registered factory roof — one Certificate of Origin covers the entire metal + plastic sub-assembly BOM.
No Inter-Vendor Tolerance Issues
Metal-to-plastic fitment managed within one quality system. Dimensional issues between machined and molded components caught before final assembly — not discovered at your receiving dock.
One Dolphin Audit Covers Everything
A split supply chain would require 3+ separate Dolphin Audits. Thang Loi's integrated capability means one audit covers CNC, molding, and assembly — verified in a single on-site visit.
Dolphin Audit: Equipment Verification Across All 4 Processes
Dolphin Audit Pillar 2 — Equipment & Capacity Confirmed
All processes physically photographed and confirmed operational: CNC milling machine ✅ · Injection molding machine ✅ · CNC lathe ✅ · Bench drill machine ✅ · Assembly area ✅. Dewin auditor on-site — not self-declared capability.
⚙️ CNC Milling Machine
What it enables: Precision metal parts with flat surfaces, pockets, slots, and complex 2D profiles to drawing tolerances.
Dolphin Audit check: Machine model confirmed, spindle operational, fixturing capacity appropriate for buyer part sizes.
🔷 Injection Molding Machine
What it enables: High-volume plastic components with consistent wall thickness, tight dimensional repeatability, and complex 3D geometry.
Dolphin Audit check: Machine operational, mold clamp tonnage verified, cooling and ejection systems functional.
🔄 CNC Lathe
What it enables: Turned cylindrical components — shafts, bushings, connectors, threaded parts — with tight OD/ID tolerances.
Dolphin Audit check: Lathe confirmed operational, chuck capacity appropriate, cutting tools and inserts stocked.
🔩 Assembly Area
What it enables: Finished sub-assemblies combining metal and plastic components under one quality system with in-process inspection between stages.
Dolphin Audit check: Dedicated assembly zone confirmed, bench drill for fastener operations verified, assembly sequence and QC procedure observed.
50-Point Dolphin Audit: 5-Pillar Results
| Pillar | Key Verification Points | Global Buyer Relevance |
|---|---|---|
| P1: Facility & Safety | Process zone separation (machining / molding / assembly), fire safety, ventilation, 5S organization | Separate zones prevent metal swarf contamination of plastic components during production |
| P2: Equipment & Capacity ★ | CNC milling, injection molding machine, CNC lathe, bench drill, assembly station — all photographed operational | Confirms genuine in-house production — critical for COO integrity and single-source sub-assembly sourcing |
| P3: Quality Systems | In-process inspection tools, NCR system, inter-process QC gates between machining → molding → assembly | Quality gates between processes catch dimensional mismatches before final assembly — reducing rework at buyer receiving |
| P4: Workforce & Management | Operator skills for CNC programming, mold setting, assembly procedures, workforce retention, supervision structure | Multi-process factories require skilled operators across disciplines — workforce depth signals operational stability |
| P5: Export Compliance | VCCI registration confirmed, Form B issuance capability for all component types, manufacturing records reviewed | $0 tariff position for US buyers requires valid VCCI Form B — Pillar 5 confirms the factory can document origin for the complete assembly |
QCLDM Tier Classification
FTA Market Access for Vietnam-Origin Sub-Assemblies
Vietnam's 16+ FTAs mean sub-assemblies from Thang Loi can reach major global markets at preferential tariff rates.
US Market — $0 Section 301
CNC-milled parts (HTS Ch.84), injection-molded plastics (Ch.39), and finished assemblies are all $0 Section 301 from Vietnam. Section 301 is China-specific (Trade Act 1974).
EU Market — EVFTA
Vietnam-EU Free Trade Agreement provides 0% or significantly reduced tariffs on qualifying machine parts and plastic components exported to all 27 EU member states.
CPTPP — 11 Nations
Comprehensive and Progressive Agreement for Trans-Pacific Partnership covers Canada, Australia, Japan, Mexico, New Zealand, Singapore, and others with preferential rates on qualifying sub-assemblies.
UK Market — UKVFTA
Vietnam-UK Free Trade Agreement provides preferential tariff rates for qualifying goods exported to the UK market post-Brexit.
Dewin vs Alibaba vs Trade Fair vs Direct Factory
| Factor | Dewin | Alibaba | Trade Fair | Direct Factory |
|---|---|---|---|---|
| All processes physically verified on-site | ✅ Dolphin Audit | ❌ Self-declared | ❌ Brochure only | ❌ No independent audit |
| COO documentation managed for full BOM | ✅ Dewin manages | ❌ Buyer manages | ❌ No support | ⚠️ Factory self-manages |
| Pre-shipment inspection on finished assemblies | ✅ On-ground team | ❌ Buyer arranges | ❌ None | ❌ None |
| Real factory photos (not stock imagery) | ✅ 6 Dolphin Audit photos | ❌ Often stock/unverified | ⚠️ Marketing photos | ⚠️ Marketing photos |
| FAI + assembly inspection documentation | ✅ Dewin on-ground | ❌ Factory dependent | ❌ None | ❌ Unverified |
| QCLDM tier classification | ✅ Tier 2 est. | ❌ None | ❌ None | ❌ None |
Dewin's 6-Step Managed Sourcing Process
RFQ & BOM Analysis
Submit your RFQ and BOM. Dewin reviews which components fit Thang Loi's multi-process capability and identifies any parts better suited to specialist factories in our 179+ network.
DFM Review
On-site DFM review with the factory covering milling tolerances, plastic wall thickness, assembly sequence, and fit between metal and plastic components.
Tooling Oversight
For injection-molded components, Dewin monitors mold fabrication milestones. Buyer-owned tooling is documented and physically tagged at the factory.
First Article Inspection
FAI dimensional report on both metal and plastic components, ballooned to buyer drawing. Assembly fitment verified before production approval.
VCCI Form B + Full Docs
Dewin manages the complete documentation: VCCI Form B, material certs for metal and resin, assembly inspection records, commercial invoice, packing list.
Pre-Shipment Inspection
On-ground PSI of finished assemblies per AQL ISO 2859-1 Level II. Failed lots reworked before cargo release. PSI report delivered to buyer before payment balance.
What Global Buyers Say About Dewin's Vietnam Network
"The quality from Dewin's Vietnam factories is excellent. We've been very impressed with the precision and consistency of the parts."
Francisco García Quintana
General Manager, LAROME 🇪🇸 Spain
"Dewin has been a great partner for our precision CNC components. The documentation and quality management have been outstanding."
Greg L. Wilhite
President, DOMS 🇺🇸 USA
"Very professional team. The factories are well-organized and the quality control process gives us confidence in every shipment."
Vishnu Shanker
Director, Texas Technology 🇺🇸 USA
Frequently Asked Questions
Why is a multi-process factory with CNC milling, injection molding, and assembly valuable for global buyers? +
Multi-process factories reduce complexity by consolidating BOM production under one quality system. For sub-assemblies combining machined metal and molded plastic, a single-source factory eliminates inter-vendor tolerance stack-up, simplifies COO documentation (one VCCI Form B for the whole assembly), and creates clear defect accountability. Dewin physically verifies all processes are operational on-site.
What FTA markets can Vietnam-origin sub-assemblies from Thang Loi access? +
Vietnam's 16+ FTAs cover major global markets: US ($0 Section 301, VCCI Form B required), EU (EVFTA, 0% on qualifying goods, EUR.1 certificate), CPTPP (Canada, Australia, Japan, Mexico + 8 others), UK (UKVFTA), and RCEP (China, Japan, South Korea, Australia, ASEAN). Each FTA requires a specific CO form type — Dewin manages this documentation.
How does Dewin ensure outsourced processes don't create COO gaps? +
Dewin's Dolphin Audit physically photographs every listed process during the on-site visit. If a factory claims injection molding but subcontracts it to an unverified facility, the audit will not confirm that process as in-house. A VCCI Form B can only reflect genuine manufacturing operations performed at the VCCI-registered factory address — subcontracted processes without proper COO chain documentation create anti-circumvention exposure.
What does Dewin's on-ground pre-shipment inspection cover for finished assemblies? +
Dewin's PSI for finished sub-assemblies covers: AQL sampling per ISO 2859-1 Level II on finished units, dimensional check on key interfaces between metal and plastic components, assembly completeness verification (all fasteners, all plastic clips, all components present), visual inspection for surface defects, and final product marking and labeling review. PSI report with photos is delivered to the buyer before shipping container is sealed.
What should buyers ask when qualifying any multi-process Vietnam factory? +
Five key questions: (1) Are all processes performed in-house, or are any subcontracted? Request photos of each machine. (2) Who owns the injection mold tooling — and where is it stored? (3) What in-process inspection happens between machining, molding, and assembly? (4) Is the factory VCCI-registered and able to issue Form B for all component types? (5) What is the NCR (non-conformance) procedure for assembly defects found before shipping?
Source Complete Sub-Assemblies from Vietnam's Audited Factory Network
CNC milling + injection molding + assembly. 179+ audited factories. 1,700+ real photos. 16+ FTAs. Dewin-managed quality from DFM to delivery.