SERVICES
Insert Molding Service
We mold Metal-to-Plastic (and compatible grades) for functional, structural and aesthetic parts — from low-volume bridge production to high-volume runs.
WHAT WE OFFER
What We Offer
HOW IT WORKS
From Inquiry to Delivery
Insert preparation
Inserts are knurled, threaded, grooved or through-holed so the plastic locks on mechanically. Brass and steel inserts are pre-cleaned and deburred before loading.
Loading into the cavity
Inserts are placed manually or by pick-and-place robot into the mold. Manual placement typically runs a 45–90 s cycle; robotic loading shrinks it further and removes operator variability.
Injection around the insert
Plastic flows around and through the insert features. The resin shrinks onto the metal as it cools — that clamping force is the core of the mechanical bond.
Cooling and ejection
The part cools in the tool and ejects with the insert captured. Design must account for the different thermal expansion of metal and plastic so the insert neither loosens nor cracks the plastic.
Inspection and secondary work
Insert position, pull-out resistance and dimensions are checked — controlled positions hold ±0.02 mm against the mold pins. Threads arrive ready to use; no post-insertion.
CHALLENGES
Challenges This Service Solves
FAQ
Insert Molding Service — FAQ
Can you help with product development?
Yes. From design review and material selection to prototyping, tooling and mass production — our engineers support you through the entire product lifecycle.
Do you ship internationally?
Yes. We ship worldwide via air and sea freight, with export packing, documentation and delivery tracking handled by our team.
What quality inspections do you perform?
First article inspection, dimensional measurement, material verification and surface checks — with inspection reports provided per batch. Full details are agreed before production.
What is the difference between rapid and production tooling?
Rapid tooling uses softer materials and simplified construction for fast, low-cost validation runs (hundreds to low thousands of parts). Production tooling uses hardened steel for high-volume, long-life programs.
How long does injection mold making take?
Rapid tooling prototypes can be ready in days; production tooling typically takes several weeks depending on complexity, cavity count and steel grade. We confirm a detailed schedule with your quotation.
Do you provide DFM feedback?
Yes. Every quotation includes a design-for-manufacturing review: draft angles, wall thickness, gate and weld-line locations, tolerance recommendations and cost-saving suggestions — before any tooling is cut.
What file formats do you accept?
We accept STEP, IGES, STL, X_T and 2D drawings (PDF or DWG). A 3D model lets us quote most accurately; 2D drawings are used to confirm critical tolerances and specifications.
How do I get a quote?
Upload your 3D file (STEP, IGES, STL or X_T) through the quote page, or email it directly. Our engineers review the design, run a DFM check and send you a detailed quotation — usually within one business day.
RELATED SEARCHES
What Buyers Search
* Keywords from Semrush competitor data — one page per search intent.
Metal-to-Plastic (Thermoplastic) Injection Molding Capabilities
Process options selected to match your part geometry, material and annual volume.
In-house Metal-to-Plastic process engineering — material selection reviewed against your mechanical and thermal requirements.
Tight-tolerance metal-to-plastic molding with automated cells for repeatable quality run after run.
Custom tooling & rapid DFM feedback — shorten lead time from design to first article.
One-stop production: molding, secondary operations and inspection under one roof.
Insert Types We Mold
The inserted component can be metal, ceramic, glass or even a hard plastic — the range below is what we run on our Sodick vertical and horizontal machines.
Insert Material Selection Guide
Material choices referenced from First Mold's insert molding page — brass is the default, everything else is application-driven.
| Insert material | Why it is used | Typical parts |
|---|---|---|
| Brass | Corrosion-resistant, affordable, easy to machine — the most common insert material | Threaded inserts, standoffs, electrical terminals |
| Stainless steel | Corrosion and temperature resistance with high strength | Medical device housings, food equipment, fasteners |
| Copper / Cu alloys | Electrical and thermal conductivity | Contacts, terminals, heatsink cores |
| Steel / alloy steel | High strength and wear resistance | Gears, shafts, locator pins, wear pads |
| Aluminum | Lightweight with good strength-to-weight | Electronics housings, EV battery components |
| Ceramic / glass | Dielectric, high-temperature insulation | Heater insulators, HV standoffs, sensors |
Insert Molding Applications
Connectors & sensors
Metal contacts and terminals molded directly into housings — microelectronic components with tight tolerances, no assembly.
Automotive gears & brackets
High-strength housings with molded-in shafts and bushes, produced under IATF 16949 control with PPAP.
Medical instruments
Stainless steel hubs, blades and sleeves encapsulated in handles — ISO 13485 traceable lots.
Power tools & appliances
Threaded brass inserts molded into housings so screws bite into metal, not plastic.
Electronics enclosures
Aluminum standoffs and heat sinks captured in one shot for EMI shielding and thermal paths.
Aerospace & defense
Ceramic and high-temp inserts for valve bodies and sensor housings in demanding environments.