Supplier Spotlight: Thuy Sam Vietnam — Integrated Die Casting, CNC Machining & In-House CMM Inspection
April 7, 2026 · 9 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
1,700+
Real Factory Photos
50-pt
Dolphin Audit
16+
FTAs
When global buyers ask what separates a credible Vietnam manufacturer from an unverified sourcing contact, one answer comes up consistently: can they prove dimensional compliance at the source? Not with a caliper and a phone photo — with a proper metrology instrument, a dedicated inspection area, and a documented measurement record you can send to your quality team.
This is Supplier Spotlight #16 in our series. Today's factory: Thuy Sam Company Limited — a Vietnam manufacturer combining die casting, CNC lathe post-machining, and in-house CMM (coordinate measuring machine) inspection under one roof. Thuy Sam was personally audited by DEWIN's on-ground team under the 50-point Dolphin framework.
Previous spotlights: Bueno Technology (CNC), Altop (Die Casting), NAPEC (CNC + CMM), HDP (CNC + VMM), Minh Quang (Multi-Process), Eguchiseiko (Die Casting), Hirata (Japanese Machining), Huynh Duc (CNC + CMM), Lidovit (Fasteners), Ming Chuan (Injection Molding), Lac Hao (Multi-Process), Kinzoku (Die Casting + CMM), Kobayashi Casting (Investment Casting), Shin Yi Valves, Bach Tung (Dual CMM + VMM).
Factory at a Glance
Full Name
Thuy Sam Company Limited
Factory Type
Die Casting + CNC Machining + Inspection
Location
Vietnam
Dolphin Audit Status
✓ Verified by DEWIN on-ground team
Key Equipment Verified
Die casting machine, CNC lathe, CMM
Factory Photos
8 real on-site photos
What Makes Thuy Sam Different: Three Processes, One Factory
Die casting produces a near-net-shape component quickly. But raw castings typically need at least two more steps before they're shipment-ready: CNC machining of critical features (bores, threads, turned diameters), and dimensional inspection to confirm tolerance compliance. Many factories outsource one or both of these — which introduces lead time, quality risk, and accountability gaps.
Thuy Sam handles all three internally:
- Die casting machine on-site — verified during DEWIN audit, produces aluminum near-net-shape blanks
- CNC lathe — post-cast machining for turned features, bores, threads, and diameters
- In-house CMM — coordinate measuring machine for 3D dimensional inspection; FAI/PPAP documentation at source
For buyers, this means one factory is accountable for the complete part from casting to finished inspection — and no inter-factory transport, communication lag, or quality handoff risk between casting, machining, and inspection.
Die casting machine — verified on-site by DEWIN
CNC lathe — post-casting machining
CMM coordinate measuring machine — in-house metrology
Dedicated inspection area — separated from production floor
CMM Deep-Dive: Why It Matters for Die Cast Components
A coordinate measuring machine (CMM) physically probes a component's surface in 3D space, records X/Y/Z coordinates for each feature, then compares them against nominal drawing dimensions. For die castings, this catches variability sources that calipers and visual inspection simply miss:
| Die Casting Variability Source | What CMM Detects | Buyer Benefit |
|---|---|---|
| Parting line shift between mold halves | Feature offset from nominal position | Catches mold wear before assembly failures occur |
| Thermal shrinkage in thick sections | Under-size or warped geometry | Ensures OD/ID and flatness meet spec |
| Core shift in cored holes | True position deviation of bores | GD&T true position — critical for bearing fits and bolt patterns |
| CNC machining drift over production runs | Cpk data on machined features | Enables PPAP process capability submission |
CMM capability comparison: 3D CMM measures true position, flatness, perpendicularity, and complex casting geometry — capabilities that calipers and 2D VMMs cannot provide for die cast parts with complex geometry.
50-Point Dolphin Audit — Key Findings at Thuy Sam
Every factory in DEWIN's network is assessed against our 50-point Dolphin audit framework across five pillars. Here's how Thuy Sam performs on the criteria most relevant to die casting and CNC machining buyers:
| Dolphin Pillar | Key Criterion | Status | Buyer Relevance |
|---|---|---|---|
| Pillar 1: Facility & Safety | Organized, clean workshop | ✓ Pass | Production discipline indicator — clean workshops correlate with quality consistency |
| Pillar 2: Equipment & Capacity | Die casting machine on-site | ✓ Verified | Confirms actual casting capability — not a trading company claiming to cast |
| Pillar 2: Equipment & Capacity | CNC machining capability | ✓ CNC lathe verified | Post-cast machining on-site — single-source for finished, toleranced components |
| Pillar 3: Quality Systems | In-house metrology equipment | ✓ CMM verified | FAI/PPAP documentation at source — no external lab required for dimensional reports |
| Pillar 3: Quality Systems | Dedicated inspection zone | ✓ Confirmed | QMS best practice — separating inspection from production floor prevents contamination pressure |
| Pillar 5: Export Compliance | COO / VCCI Form B capability | ✓ Capable | Vietnam Certificate of Origin — required for FTA duty benefits (EVFTA, CPTPP, RCEP) |
Main production workshop
Production area — finished components
Factory exterior — second view
Factory entrance
FTA Export Advantage for Thuy Sam's Die Cast Components
Vietnam's network of Free Trade Agreements means buyers in multiple markets receive preferential duty rates on aluminum die castings and machined components sourced from Thuy Sam — provided a valid Certificate of Origin is issued.
How DEWIN Works with Thuy Sam — 6-Step Sourcing Flow
- Drawing & RFQ submission — Submit your 2D drawing or 3D CAD. DEWIN assesses which Thuy Sam process (die casting or CNC turning) is the right fit for your part.
- Tooling & mold design — For new die casting programs, Thuy Sam designs and fabricates the die mold. Typical aluminum die tooling lead time: 4–6 weeks.
- First article production & CMM-measured FAI — Initial parts produced, then measured on the CMM. FAI report with measured vs. nominal dimensions issued before production approval.
- Production run — Approved design proceeds to volume production. Typical lead time: 3–5 weeks depending on quantity.
- Pre-shipment AQL inspection — DEWIN's on-ground team conducts final AQL inspection before loading. Includes dimensional spot-check and cosmetic review.
- COO documentation & quality dossier — VCCI Form B or FTA-specific CO issued. Full quality package (FAI report, COO, dimensional data) delivered digitally before shipment.
DEWIN vs. Finding a Die Casting Factory Yourself
| Factor | DEWIN + Thuy Sam | Alibaba / Directory | Trade Fair Contact |
|---|---|---|---|
| Factory physically audited | ✓ Yes | ✗ No | ✗ No |
| CMM independently confirmed | ✓ Photographed on-site | Self-reported | Self-reported |
| Real factory photos (8 verified) | ✓ Yes | Varies | ✗ Rarely |
| COO / VCCI Form B managed | ✓ Included | ✗ Your problem | ✗ Your problem |
| Pre-shipment AQL inspection | ✓ On-ground team | ✗ No | ✗ No |
| FAI/CMM documentation managed | ✓ Yes | ✗ No | ✗ No |
Frequently Asked Questions
What processes does Thuy Sam handle under one roof?
Thuy Sam handles die casting (die casting machine verified on-site), CNC lathe post-machining for turned features, bores, and threads, and in-house CMM dimensional inspection. This integrated capability makes them a single-source for die cast + machined + inspected aluminum components.
Does Thuy Sam have a CMM and can it produce FAI documentation?
Yes. Thuy Sam's CMM was photographed and confirmed during DEWIN's on-site audit. Their dedicated inspection area and CMM capability supports First Article Inspection (FAI) report generation with CMM-measured dimensional data. Contact DEWIN to discuss PPAP level requirements for your specific program.
Which FTA markets benefit most from Thuy Sam's Vietnam origin?
US buyers benefit most from the Section 301 exemption ($0 vs. est. 25% on China-origin castings). EU buyers can leverage EVFTA (up to 0% duty). Asia-Pacific buyers can use CPTPP. All markets benefit from Vietnam's 16+ FTA network — each requires a valid Certificate of Origin issued per the relevant agreement's rules of origin.
How does DEWIN manage quality with Thuy Sam during production?
DEWIN's on-ground team manages the full quality cycle: tooling approval, FAI sign-off using CMM reports, production monitoring, and pre-shipment AQL inspection before loading. You receive a quality dossier — FAI report, dimensional data, COO certificate — before shipment.
Source Aluminum Die Castings from Vietnam
Thuy Sam offers die casting, CNC machining, and CMM inspection under one roof — backed by DEWIN's 50-point Dolphin audit. We manage factory match, tooling, FAI, pre-shipment inspection, and COO documentation.