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Custom Mold Core & Cavity Inserts
- Material: SKD61 Hc
- Hardness: HRC 48–52 for SKD61 base; HRC 60–64 post ion nitriding
- Tolerance: ±0.001 mm
- Surface Finish: Precision Ground
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High-Precision Engineering
All special-shaped SKD61 mold components are processed on high-rigidity precision equipment, with seamless transitions for stepped, curved, spherical and cut-out features. Mounting bases, positioning holes and forming heads are machined in one setup to guarantee perfect assembly fit with mold plates.
This enables clean forming of complex part contours, smooth ejection and consistent product appearance across mass production batches.
Durable SKD61 Hot Work Steel Construction
Crafted from premium SKD61 hot work tool steel, these mold inserts deliver core performance strengths:
- Excellent thermal shock & high-temperature fatigue resistance for long hot mold cycles
- Low thermal expansion rate to preserve dimensional stability under sustained heat
- Balanced toughness and hardness, resistant to bending or cracking under ejection impact
- Great bonding performance for nitriding and hard coating surface treatments Ideal for die casting and high-temperature injection molding environments where heat stability is critical.
Wide Profile Customization
This SKD61 component range covers diverse mold forming needs:
- Large stepped main core shafts
- Square/rectangular locating & forming blocks
- Spherical, bullet-tip miniature forming inserts
- Flanged sleeve core pins
- Special notched & curved cavity inserts Custom CAD drawings and physical samples are fully supported for prototype and bulk manufacturing.
Custom Engineering Support
- Fully customized dimensions, profiles, mounting holes and forming head shapes
- Multiple surface treatments: ion nitriding, TiN coating, mirror polishing, black oxide
- Material grade switching to D2/S136/P20 based on mold temperature, cycle count and plastic raw material
- DFM consultation, stress relief and heat treatment process planning
- Rapid prototype sampling + mass production delivery
Key Features & Advantages
- Complex Geometry Capability: 5-axis machining handles irregular, multi-step, curved and cut-out profiles standard lathe equipment cannot process.
- Long Service Lifespan: SKD61’s superior heat resistance drastically reduces high-temperature deformation and wear.
- Interchangeable Precision: Strict tolerance control ensures inserts can be swapped without re-adjusting mold alignment.
- Flexible Customization: No fixed standard sizes; produce unique special mold parts per client design requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Primary Base Material | SKD61 Hot Work Tool Steel |
| Alternative Materials | D2, S136, P20, H13 |
| SKD61 Heat Treated Hardness | HRC 48–52 (Base), HRC 60–64 (Nitrided Surface) |
| Dimensional Tolerance | ±0.001mm for critical forming surfaces |
| Flatness/Concentricity | ≤0.002mm |
| Surface Roughness | Ra ≤0.03μm (Ground), Ra ≤0.005μm (Mirror Polish) |
| Manufacturing Processes | 5-Axis CNC Milling/Turning, Jig Grinding, Wire EDM, Hardening & Tempering |
| Surface Treatments | Ion Nitriding, TiN Coating, Mirror Polishing, Black Coating |
| Customization | 100% Supported from CAD Drawings & Physical Samples |
Applications
Automotive
Used in aluminum die casting and high-temperature injection molds for automotive structural plastic parts, metal casting brackets, sensor housings and wiring connector shells; SKD61 stepped and curved cores maintain stable precision under continuous high mold operating temperatures.
Medical
For anti-corrosion upgrade, we offer S136 replacements for medical device molds; SKD61 inserts work for robust non-transparent medical instrument casing molds, forming rigid structural plastic components with consistent molding stability.
Consumer Electronics
Applied in high-cycle injection molds for electronic frame structural blocks, battery positioning posts and device housing contour forming; custom irregular SKD61 cores replicate intricate product outlines with minimal thermal expansion deviation.
Plastic Packaging
Ideal for thick-wall cosmetic container molds, heavy-duty bottle cap contour cores and rigid packaging shell forming inserts; SKD61 withstands repeated ejection wear for large-volume packaging production runs.
Automation Fixture
Deployed as high-temperature resistant precision locating pins, forming blocks and mold tooling inserts for automated molding lines, delivering stable positioning and extended service life for non-stop mass production.
