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Insert Molding Services

Produce sturdy and high-quality prototypes and production parts through custom insert molding services.Upload a part to get an online quote.

ISO 9001:2015 | ISO 13485:2016 | IATF16949

What is Insert Molding?

Insert molding is an injection molding process where one or multiple pre-made inserts or metal components are placed into a mold and plastic material is injected around them during the molding process. This technique integrates inserts or metal parts directly into plastic components, creating a unified single-piece part by combining plastic with other materials.

Inserts typically consist of metal, plastic, or other materials. They are placed into the injection mold, and molten plastic is injected around these inserts, securing them within the final plastic part. This process allows the integration of inserts with plastic through methods such as mechanical bonding, chemical adhesion, or fusion between melted plastic and the insert’s surface.

Boyi Insert Molding Capabilities

Insert molding can improve the manufacturing feasibility of parts, shorten delivery time, and improve the appearance of parts.For a free insert molding design review and quote, upload your CAD files here.

Standards Metric units Imperial units

Maximum Part Size


23.62×39.37×11.81 in.

Minimum Part Size

2×4×4 mm

0.08×0.16×0.16 in.


±0.025 mm

±0.001 in.


Inserts can be female and male. They both can improve a product’s appearance and utility.

Standard Lead Time

From mold making to sample delivery: 15-45 business days

Materials for Insert Molding

We offer hundreds of materials that can help you produce insert molding parts for various industry applications. The materials commonly used include but are not limited to:

Metal Materials

Plastic Materials

Other Special Materials

Gallery of Insert Molding Parts

Applications for Insert Molding

Efficiently produce thousands to millions of identical parts through insert molding. These parts have completely dense, smooth characteristics and excellent mechanical properties in the final product.

Automotive Industry

Used for manufacturing parts with high strength, wear resistance, and high temperature resistance.


Commonly used in the production of electronic components, such as casings or support structures.

Medical Devices

Combining different materials to make parts to achieve specific functions and hygiene requirements.

Consumer Goods

Used for the casing of electrical appliances, handles for household tools, buttons for office equipment, etc.

About Insert Molding FAQ

No minimum order quantity. Whether it is a single part or thousands of parts, it helps to quickly transfer insert molding parts from design to production.

Yes, we offer prototyping services, where prototypes can be made prior to mass production of insert molding. Prototypes help validate designs, review and improve, reduce late-stage risk, and can be used for market testing and user feedback.

Insert molding is particularly suitable for parts with threaded holes. It can also help you manufacture better wheels, pulleys, fan blades, and other similar parts. If insert molding is not suitable for you, you can also try vacuum casting or 3D printing.

Manufacturing Resources

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