Insert Molding Service
with Mastars
Get custom plastic parts with metal inserts: upload your part for a quick online quote.
Insert Molding Service
Our insert molding services deliver custom prototypes and on-demand production parts with lead times as fast as 15 days. We utilize cost-effective aluminum molds and work with a variety of thermoplastic and liquid silicone rubber materials to balance part quality with tooling economy.
Our insert molding process is particularly well-suited for:
·low-volume production parts
·bridge tooling
·pilot runs
·functional prototyping and testing
Insert Molding Design Guidelines
We don't have MOQ, only 1pcs is according to high standard to make, we pursuit the product is perfect to every customer, from 1pcs to million,we are glad to witness and grow together with our customers, that make us proud.
Our overmolding & insert molding guidelines cover key design considerations to boost part manufacturability, elevate aesthetics, and shorten production timelines.
| US | Metric | |
| Maximum Part Size | 18.9 in. x 29.6 in. x 8 in. | 480mm x 751.8mm x 203.2mm |
| Volume | 59 cu. in. | 966,837 cu. mm |
| Depth | 4 in. from parting line | 101mm from parting line |
| Depth | up to 8 in. if the parting line can pass through middle of part | Up to 203.2mm if the parting line can pass through middle of part |
| Projected Mold Area | 175 sq in. (plastic) | 112,903 sq. mm (plastic) |
| Projected Mold Area | 48 sq. in. (silicone rubber) | 30,958 sq. mm (silicone rubber) |
What is Insert Molding?
The insert molding process involves overmolding a pre-formed insert (such as a metal element) with thermoplastic to create a robust, integrated component. A key advantage of our service is the seamless handoff from production to shipment: completed parts are immediately prepared for dispatch, streamlining your supply chain and accelerating time-to-market.
Insert Molding Capabilities
Insert molding differs from two-shot overmolding by starting with a pre-made insert, often metal, which is then placed into a mold and overmolded with plastic. The result is a composite part with superior properties.
This technique is ideal for embedding threaded inserts to create strong, reusable threads in plastic, and for adding bushings or sleeves to enhance wear resistance in high-movement areas.
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Manufacturing on Demand
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