Wire EDM from Audited Vietnam Factories
Tolerances to ±0.002mm. Tool steels, titanium, carbide, Inconel. Dolphin-verified machines. Full FAI/PPAP documentation. 16+ FTA tariff advantage for US, EU, CPTPP, and UK buyers.
179+ audited factories · 50-point Dolphin Audit · Fanuc / Makino / Mitsubishi verified on-site · VCCI Form B COO every shipment
Why Wire EDM? Vietnam's Growing Precision Capability
Vietnam's precision manufacturing industry has grown significantly with Japanese-managed factories leading the transition to high-accuracy Wire EDM work. Our on-ground team has physically audited Wire EDM factories across Ho Chi Minh City, Binh Duong, Dong Nai, and Hanoi — verifying machine models, wire diameter capability, measurement equipment, and documentation systems before any factory enters our network.
Zero Cutting Force
Spark erosion removes material with no mechanical contact — enabling complex profiles in fully hardened materials (D2 at 62 HRC, carbide at 92 HRA) that would deflect or chip under conventional cutting forces.
Aerospace-Grade Tolerances
±0.002–0.005mm positional accuracy. Ra 0.1 µm surface finish with skim passes. Internal corners to R0.05mm. All achievable at Vietnam factory pricing — verified by our team, not taken on trust.
Full FAI/PPAP Docs
CMM dimensional reports, material certs, surface roughness certificates, COO documentation, and PPAP Level 2–3 packages — all managed by Dewin's on-ground sourcing team, not left to the factory alone.
Wire EDM vs Sinker EDM — Both Available in Our Network
| Factor | 🔌 Wire EDM | ⚙️ Sinker (Ram) EDM |
|---|---|---|
| Feature Type | 2D through-profiles, slots, blind-entry cuts | 3D blind cavities, mold pockets, undercuts |
| Internal Corner | R0.05mm minimum (0.1mm wire) | Depends on electrode geometry — can be sharper |
| Tolerance | ±0.002–0.005mm | ±0.005–0.015mm |
| Surface Finish | Ra 0.1–0.8 µm (skim cuts) | Ra 0.2–1.6 µm |
| Speed | Faster for simple through-profiles | Faster for complex 3D cavities |
| Best Application | Punches, dies, gears, brackets, implants | Mold cavities, die inserts, turbine root forms |
Both Wire and Sinker EDM are available in our audited Vietnam network. Many factories offer both under one roof — reducing COO complexity and quality accountability splits.
Materials — EDM Cuts What Others Can't
Our audited Wire EDM factories work with all electrically conductive materials. Material hardness does not affect EDM cutting speed — making it the only viable precision process for many tooling and aerospace applications.
| Material Group | Grades | Best Applications | FTA Advantage |
|---|---|---|---|
| Tool Steels | D2, H13, M2 HSS, A2, O1, P20 | Dies, punches, molds — hardened to 58–65 HRC, EDM is the only practical process | EVFTA 0% / US $0 |
| Stainless Steel | 304, 316, 17-4PH, 15-5PH, 410 | Corrosion-resistant precision components, medical and food-grade | EVFTA 0% / CPTPP 0% |
| Titanium | Grade 2 (CP), Grade 5 (Ti-6Al-4V), Grade 23 | Aerospace brackets, medical implants, lightweight structural | EVFTA 0% / US $0 |
| Aluminum | 6061-T6, 7075-T6, 2024-T4 | Lightweight housings, aerospace, consumer electronics | CPTPP 0% / EVFTA 0% |
| Carbide | WC-Co (K10, K20, K30, K40) | Ultra-hard cutting inserts, dies, wear parts — EDM-only process | RCEP preference |
| Copper / Brass | C11000 ETP, C36000, C17200 BeCu | Electrical contacts, busbars, RF shielding, connectors | EVFTA 0% / UKVFTA 0% |
| Inconel / Superalloys | Inconel 718, 625, Hastelloy C-276 | High-temp turbine components, aerospace hot-section parts | EVFTA / CPTPP |
| Hardened Steel | 4140, 4340, 8620 (to 60 HRC) | Post-heat-treatment precision features, gears, bearing races | US $0 / EVFTA 0% |
50-Point Dolphin Audit — How We Verify Wire EDM Factories
Every Wire EDM factory in our network is visited and scored on-site. The 50-point Dolphin Audit covers 5 pillars, 10 criteria each. Wire EDM factories must score 50/100 minimum to enter Tier 3; 75/100 for Tier 1 (required for FAI/PPAP programs).
| Audit Pillar | Max Score | Wire EDM — What We Verify |
|---|---|---|
| Pillar 1: Facility & Safety | 10 pts | Dielectric fluid system, filtration, electrical safety, 5S wire storage, climate control for precision gauging |
| Pillar 2: Equipment & Capacity | 10 pts | Machine brand (Fanuc/Makino/Mitsubishi/Sodick), model, axis travel, Z-height, fine wire capability (0.1mm), servicing records |
| Pillar 3: Quality Systems | 10 pts | CMM or VMM availability, calibration records, skim-cut SOP, surface roughness tester, NCR documentation process |
| Pillar 4: Workforce | 10 pts | CNC programmer qualifications, EDM-specific training, GD&T/ASME Y14.5 drawing reading, English technical communication |
| Pillar 5: Export Compliance | 10 pts | VCCI registration, Form B issuance, material traceability (mill certs by heat/lot), production records for CBP substantiation |
16+ FTA Advantage — Wire EDM from Vietnam to Your Market
Vietnam's FTA network means zero or near-zero import duties on Wire EDM parts into most major manufacturing buyer markets. We manage the CO form type for your target market.
🇺🇸 United States
No China Section 301 surcharge on any Vietnam-origin Wire EDM parts. Most precision machined parts save 7.5–25% vs China source.
🇪🇺 European Union
0% duty on most precision machined components (HS 84, 73, 76, 90). EU buyers sourcing tool steel inserts and precision parts save typically 3–5.7% MFN rate.
🌏 CPTPP Nations
0% for Japan, Australia, Canada, New Zealand, and 7 other CPTPP members. Japan particularly valuable — VJEPA also available for Japanese buyers.
🇬🇧 United Kingdom
0% tariff on most precision machined parts for UK buyers post-Brexit. UK buyers sourcing Wire EDM parts pay $0 vs typical 2.7–6% MFN.
How We Source Your Wire EDM Parts
Drawing Review & DFM
We review your drawings for Wire EDM DFM: wire access, internal corner radii, taper angles, surface finish requirements, and secondary operations (CNC finishing, heat treatment, coating).
Factory Matching
We match your part to the right Dolphin-audited factory based on machine capability, wire diameter (0.1mm vs 0.25mm), material experience, and PPAP/FAI track record.
On-Site Setup Verification
Our Vietnam team visits for first-article setup: machine program verification, wire diameter confirmation, skim-cut parameters, fixturing, and measurement equipment check.
FAI & CMM Report
Full dimensional balloon report to your drawing. CMM-measured GD&T callouts, surface roughness certificate, and material cert (mill cert, heat/lot number traceable).
COO Documentation
VCCI Form B for US buyers. EUR.1/REX for EU. CPTPP CO for Japan/Australia/Canada. UKVFTA declaration for UK. All managed by Dewin — not delegated to the factory alone.
Pre-Shipment Inspection
AQL sampling to ISO 2859-1, dimensional spot-check, cosmetic inspection, documentation package verification. PSI report sent to you before we approve shipment release.
Dewin vs Alibaba vs Trade Fair Sourcing
| Factor | Dewin (Audited) | Alibaba | Trade Fair |
|---|---|---|---|
| Factory Physical Verification | ✅ 50-point on-site Dolphin Audit | ❌ Self-reported only | ❌ Booth presentation only |
| Machine Model Verified On-Site | ✅ Brand + model + serial confirmed | ❌ Photo claims only | ❌ Not checked |
| CMM / VMM for FAI | ✅ Verified and calibrated | ⚠️ Unknown | ⚠️ Unknown |
| Wire Diameter (0.1mm fine wire) | ✅ Confirmed if available | ⚠️ Claimed, not verified | ⚠️ Claimed, not verified |
| PPAP / FAI Documentation | ✅ Tier 1 factories only (scored) | ⚠️ Varies | ⚠️ Varies |
| FTA COO Management | ✅ VCCI/EUR.1/CPTPP managed by Dewin | ❌ Your responsibility | ❌ Your responsibility |
Verified Client Outcomes
"Dewin found us a precision machining factory in Vietnam that had the CNC capability we needed, at a price point that made the tariff savings real."
🇪🇸 Francisco García Quintana, LAROME
"The documentation package — FAI, CMM report, COO — was exactly what our quality team needed. Vietnam sourcing done properly."
🇺🇸 Greg L. Wilhite, President, DOMS
"We switched precision machined components from China to Vietnam through Dewin. Parts quality was equal or better, and we eliminated the tariff exposure entirely."
🇮🇳 Vishnu Shanker, Texas Technology
Wire EDM from Vietnam — FAQ
What Wire EDM capability does Dewin's Vietnam factory network offer? +
Our Dolphin-audited network includes Wire EDM factories with machines from Fanuc, Makino, Mitsubishi, and Sodick — all physically verified on-site by our team. Capabilities include 0.1mm fine wire for tight internal corners (R0.05mm), taper cutting to ±30°, workpiece heights up to 500mm on tall-cut machines, and skim-cut finishing passes for Ra 0.1–0.2 µm surface finish. All machines are verified operational and calibrated.
What is the Dolphin Audit and how does it apply to Wire EDM factories? +
The 50-point Dolphin Audit is Dewin's on-site factory verification system. For Wire EDM factories, the audit covers: Pillar 1 (facility safety, dielectric fluid management), Pillar 2 (equipment brand/model verification, wire diameter capability, axis travel), Pillar 3 (CMM/VMM availability, calibration records, SOP documentation), Pillar 4 (programmer qualifications, drawing interpretation, GD&T capability), and Pillar 5 (VCCI registration, COO issuance, material traceability). Factories scoring 75+ are Tier 1; 50–74 are Tier 2. Only Tier 1 and Tier 2 qualify for FAI/PPAP programs.
Which FTA agreements give Wire EDM parts from Vietnam a tariff advantage? +
Vietnam has 16+ active Free Trade Agreements. For Wire EDM parts: US buyers benefit from $0 Section 301 tariffs (Vietnam is not subject to the China-specific Section 301). EU buyers get 0% on most precision machined parts under EVFTA (Certificate of Origin Form EUR.1 or REX). Japanese buyers get 0% under VJEPA. Australian, New Zealand, and other CPTPP members get 0% under CPTPP. UK buyers get 0% under UKVFTA. For each shipment, we manage the CO form type that gives your target market the best rate.
What documentation do your Wire EDM factories provide? +
Standard documentation package: material certificates (mill certs with heat/lot number), CMM dimensional inspection report (first article and production spot-checks), surface roughness test certificate, pre-shipment inspection report (AQL sampling), Certificate of Origin (VCCI Form B for US buyers, or FTA-specific CO form for EU/CPTPP/UKVFTA buyers), packing list, and commercial invoice. PPAP Level 2–3 and AS9100D-adjacent documentation available from Tier 1 factories with prior PPAP program experience.
Can Vietnam Wire EDM factories cut carbide and Inconel? +
Yes. Unlike conventional milling, Wire EDM speed is independent of material hardness. Our audited factories regularly cut tungsten carbide (WC-Co grades K10–K40), Inconel 718, Hastelloy C-276, and fully hardened D2 tool steel at 62–65 HRC. These are precisely the materials where Wire EDM is often the only viable precision process. Factory matching for exotic materials includes verification that the team has prior experience cutting the specific alloy and grade.
Source Wire EDM from Audited Vietnam Factories
Browse our network of Dolphin-audited Wire EDM suppliers. Request a factory tour. Get a quote with full FTA documentation managed by our on-ground team.