Tiếng Việt
日本語
Materials & Machining Capabilities
The metals and plastics we machine, with AISI / UNS equivalents for overseas drawings — plus the processes and tolerances behind every part.
Materials We Machine, with US Equivalents
JIS grades are standard in Vietnam and Japan. The table maps each to its closest AISI, ASTM or UNS equivalent, so you can check your drawing at a glance.
Aluminum alloys
| JIS | US equivalent | UNS | Notes |
|---|---|---|---|
| A2017 | 2017 | A92017 | T351 temper recommended for dimensional stability |
| A5052 | 5052 | A95052 | Good corrosion resistance, sheet and plate parts |
| A6061 | 6061 | A96061 | General-purpose structural parts |
| A6063 | 6063 | A96063 | Extrusion-based parts |
| A7075 | 7075 | A97075 | High strength |
Stainless steel
| JIS | US equivalent (AISI) | UNS | Notes |
|---|---|---|---|
| SUS303 | 303 | S30300 | Free-machining grade |
| SUS304 | 304 | S30400 | General-purpose austenitic |
| SUS316 / 316L | 316 / 316L | S31600 / S31603 | Improved corrosion resistance |
| SUS420J2 | 420 | S42000 | Hardenable martensitic |
| SUS440C | 440C | S44004 | High hardness, wear parts |
Carbon, alloy and tool steel
| JIS / standard | US equivalent | UNS | Notes |
|---|---|---|---|
| S45C | AISI 1045 | G10450 | Medium-carbon steel |
| S50C | AISI 1050 | G10500 | Medium-carbon steel |
| SCM435 | AISI 4135 / 4137 | G41350 | Chromium-molybdenum steel |
| SCM440 | AISI 4140 | G41400 | Chromium-molybdenum steel |
| SS400 | ASTM A36 (approx.) | K02600 | Structural steel |
| SKD11 | AISI D2 | T30402 | Cold-work tool steel |
| ASTM A572 | — | — | HSLA structural steel, import sourcing supported |
| ASTM A519 (1026) | — | G10260 | Mechanical tubing, import sourcing supported |
Copper alloys
| JIS | US equivalent | UNS | Notes |
|---|---|---|---|
| C1100 | C11000 | C11000 | Tough-pitch copper |
| C3604 | C36000 (approx.) | C36000 | Free-cutting brass |
Engineering plastics
| Material | Common name | UNS | Notes |
|---|---|---|---|
| PEEK | Polyether ether ketone | — | High heat and chemical resistance |
| POM | Acetal (e.g. Delrin) | — | Low friction, dimensionally stable |
| MC Nylon | Cast nylon 6 | — | Wear parts, large blocks |
| PTFE | Teflon | — | Chemical resistance, low friction |
| PC | Polycarbonate | — | Impact resistant, transparent grades |
| PVC | Polyvinyl chloride | — | Chemical resistance |
Equivalents are the closest common grades, not exact matches in chemistry or properties. Please specify the grade on your drawing; we confirm material before quoting. Other materials are available on request.
Machining Processes
Each part is assigned to the partner factory best suited to its material, geometry and volume, from single prototypes to small batches.
5-axis CNC machining
Complex geometry in fewer setups, up to 400 mm (15.7″) cubic size.
CNC turning & milling
Shafts, housings, plates and brackets, including drilling and tapping.
Wire EDM & EDM
Hardened materials, fine slots and sharp internal corners.
Precision grinding
Flat and cylindrical surfaces with tight size and finish requirements.
Surface treatment
Anodizing, plating and other finishes through our partner network.
Heat treatment
Arranged as part of the same order, with inspection after treatment.
Precision & Tolerances
Typical ranges we handle regularly. Achievable values depend on part size, material and design; we review every drawing before quoting.
| Item | Typical range |
|---|---|
| Critical dimensions | Down to ±0.01–±0.02 mm on specified features |
| General tolerances | Per JIS B 0405 (equivalent to ISO 2768), or as specified on your drawing |
| Hole and shaft fits | H7 / H8 grade fits, e.g. Ø18 H7 |
| Geometric tolerances | Flatness, parallelism, perpendicularity: 0.02–0.05 mm, depending on part size |
| Surface roughness | Ra 1.6, Rz 3.2–Rz 12.5 |
| Inspection | 3D CMM, KEYENCE optical measurement, XRF material analysis on request |
Cast Parts: Not Yet Supported Directly
We currently focus on machined parts produced from bar, plate and tube stock, and do not operate casting production ourselves. We are expanding our casting partner network, so please contact us if your project includes cast components.
Materials & Capability Questions
Looking for a specific material or process? Email info@yoshimoto.vn
What materials can you machine?
Aluminum alloys (A2017, A5052, A6061, A6063, A7075), stainless steel (SUS303, SUS304, SUS316/316L, SUS420J2, SUS440C), carbon, alloy and tool steel (S45C, S50C, SCM435, SCM440, SS400, SKD11, ASTM A572, ASTM A519), copper alloys (C1100, C3604) and engineering plastics (PEEK, POM, MC Nylon, PTFE, PC, PVC).
Can you work from drawings that specify AISI or ASTM grades?
Yes. We map the specified grade to a locally available equivalent for your approval, or source the specified grade through import channels when needed.
Do you source imported materials?
Yes. For materials with limited availability in Vietnam, such as certain ASTM-grade steels and specific aluminum tempers, we coordinate import sourcing through established supplier channels.
What tolerances can you hold?
Critical dimensions down to ±0.01–±0.02 mm on specified features, H7/H8 fits, and geometric tolerances of 0.02–0.05 mm depending on part size. General tolerances follow JIS B 0405 (equivalent to ISO 2768) unless your drawing specifies otherwise.
Can you provide material certificates?
Yes. Material certificates and RoHS documentation are available on request, and material can be verified by XRF analysis before machining.
Can you supply cast parts?
Not directly at this time. We focus on machined parts from bar, plate and tube stock, and are expanding our casting partner network. Please contact us to discuss projects that include cast components.
Send Your Drawings for a Quote
Tell us the material and tolerances you need. We review manufacturability and reply with a quote within 3 business days.