Drawings override defaults
These defaults apply only where your drawing or 3D model annotations are silent. Toleranced dimensions, cosmetic surface designations, and material/finish callouts on your drawing always override the defaults above. Every quote includes a free DFM analysis reviewing wall thickness, draft angles, gate locations, sink marks, and weld lines before tooling begins.
Default Tolerances
| Feature | Standard | Precision / Limit |
|---|---|---|
| Dimensional tolerance | ±0.100 mm (±0.004") | ±0.025 mm (±0.001") for engineered resins |
| Draft angles | 0.5° minimum on all vertical faces | 3.0°–5.0° for textured surfaces (SPI sandblast or VDI) |
| Minimum wall thickness | ABS 0.76 mm / PC 1.02 mm / PP 0.64 mm | PA6/PA66 0.51 mm / POM (Delrin) 0.38 mm |
| Max part envelope | 1,200 × 1,000 × 800 mm | Subject to part geometry & flow analysis |
| Mold life (SPI class) | SPI Class 103 (100K–500K shots), P20 pre-hardened steel | SPI Class 101 (1,000,000+ shots), S136/H13 hardened steel |
* Values match the specification tables on our Injection Molding service page. Tighter requirements are reviewed per part.
Finish Expectations
| Finish | Specification | What to Expect |
|---|---|---|
| Mirror polish (SPI A-1 to A-3) | Diamond polish, Ra 0.012–0.10 µm | Ultra-glossy, optically clear parts — lenses, light pipes, high-cosmetic consumer trims. |
| Semi-gloss (SPI B-1 to B-3) | Grit paper polish, Ra 0.05–0.35 µm | Medium luster matte finish; reduces reflection and hides minor mold tool marks. |
| Fine matte (SPI C-1 to C-3) | Stone polish, Ra 0.35–0.80 µm | Dull, non-reflective surfaces; excellent scratch resistance and masks parting lines. |
| Sandblast / VDI textures | Glass bead/flint blast, Ra 0.80–3.00 µm (VDI 3400) | Satin textures and erosion patterns for ergonomic grips and heavy industrial parts. |
Edges, Burrs & Cosmetic Surfaces
Parting lines, gate vestiges, and ejector marks are inherent to injection molding. Fine matte SPI C finishes mask parting lines, and VDI 3400 textures are used on industrial parts. Flag cosmetic surfaces and acceptable gate locations on your drawing — gate locations, sink marks, and weld lines are reviewed in the free DFM analysis before tooling.
Inspection Options
- Free DFM analysis with every quote (wall thickness, draft angles, gate locations, sink marks, weld lines)
- T1 samples provided for approval before production begins
- Moldflow analysis during in-house mold design
- Material traceability via resin suppliers (SABIC, DuPont, Mitsubishi)
- Mold maintenance records provided on request — you own the mold
Full detail on inspection tiers and documentation is on our Quality Hub.
Vietnam Network Notes
DEWIN partners with 25+ injection molding factories across Vietnam running machines from JSW, Toshiba, Haitian, and Engel, ranging from 50T to 2,500T. Tooling uses P20, NAK80, S136, and H13 tool steels, made with EDM, wire EDM, and high-speed CNC.
Typical Lead Times
| Scope | Lead Time |
|---|---|
| Simple molds | 2–3 weeks |
| Standard production molds (to T1 samples) | 15–25 business days |
| Express tooling | 10–12 business days |
| Complex multi-cavity tools | 5–8 weeks |
Quote your injection molding parts against these standards
Upload your drawings — callouts on your drawing override every default on this page.
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