Engineered for injection molders tackling intricate plastic parts (automotive, electronics, medical devices), our client-driven custom slides & inserts are precision-built to match your 2D/3D drawings (CAD, STEP, IGES, DXF). Specialized in handling complex undercuts—from small hooks on electronic connectors to deep recesses in automotive interior trims—they ensure smooth demolding without damaging parts, even for geometries that standard molds can’t accommodate.
Complex plastic parts with undercuts (e.g., snaps, threads, or recessed features) pose 3 critical challenges for manufacturers using off-the-shelf or poorly customized slides/inserts:
- Mismatch with client drawings leads to undercut misalignment, causing part deformation or stuck molds during demolding;
- Rigid, one-size-fits-all designs fail to handle unique undercut angles (30°–120°) or depths (5mm–50mm), limiting part design flexibility;
- Low-precision slides create uneven contact with parts, resulting in surface scratches or incomplete undercut formation.
Heya solves these by designing slides & inserts exclusively from your 2D/3D drawings—combining 18+ years of undercut molding expertise with adaptive engineering to handle even the most complex geometries.
We tailor every slide and insert to your part’s unique undercut features, with flexibility to adapt to diverse complex designs:
Our slides & inserts are engineered to simplify demolding of complex parts while protecting quality, with specs that directly boost production efficiency:
- Dual Certifications: ISO 9001 (general manufacturing) and IATF 16949 (automotive) to meet strict standards for industries like automotive and medical, where undercut precision is critical.
- Material Traceability: Full documentation (steel certificates, heat-treatment records, dimensional reports) provided for every batch—essential for clients requiring supply chain transparency (e.g., medical device manufacturers).
- Pre-Production Testing: We validate slides & inserts in a mock mold setup using your target resin (e.g., PC for electronic parts, PP for automotive clips) to test undercut demolding, wear resistance, and part quality before delivery.

- Automotive Mold Manufacturers: For complex parts with hidden undercuts (e.g., dashboard trim clips, door handle recesses) where precise demolding ensures compliance with IATF 16949.
- Electronic Component Molders: For small, intricate parts (e.g., connector housings with internal threads, sensor casings with snap features) requiring micron-level undercut accuracy.
- Medical Device Producers: For corrosion-resistant molds (S136 steel) making parts with undercuts (e.g., syringe plungers, inhaler components) where surface quality and reliability are non-negotiable.
Need slides & inserts for your complex undercut parts? Upload your 2D/3D drawing—Heya’s engineers will provide a free DFM (Design for Manufacturability) report (including undercut demolding strategies) and detailed quote within 24 hours.
Bonus: Download our [Custom Slides & Inserts Spec Sheet] for undercut design guidelines, material comparisons, and success case studies with complex parts.