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Insert Molding Service

The perfect match of metal and plastic. No plastic cracking, no hardware misalignment, and zero flash.

ISO 9001:2015 | ISO 13485:2016 | IATF 16949:2016

Compatible Hardware & Insert Types

Insert molding is the process of injecting molten plastic around a pre-placed non-plastic component. For your projects, this means permanently integrating fastening, conductivity, or structural strength directly into the plastic part—completely eliminating post-molding assembly steps.

Threaded Fasteners (Nuts & Studs)

Brass or stainless steel threads inside and studs outside. Needed for repeated high-force tightening and strong case/cover closure.

Electrical Contacts & Pins

Copper, brass, or gold-plated pins. Common in medical probes, car sensors, and complicated electronic connectors.

Stamped Metal & Lead Frames

Metal plates and lead frames. Sealed in plastic to provide grounding inside, route circuits, or add a lot of strength.

Clips, Meshes & Magnets

Spring clips, sound-filter meshes, and permanent magnets. Molded right into the plastic part for special functions.

What you can make with insert injection molding?

Insert molding is a versatile manufacturing process that enables the production of complex and high-precision parts. At First Mold, we have extensive experience in insert molding and have successfully produced a wide range of parts and products for various industries. For example, we have produced microelectronic components such as connectors, switches, and sensors that require high precision and tight tolerances. Additionally, we have manufactured automotive parts such as gears, housings, and brackets that require high strength and durability.

Automotive

Medical

Aviation

Consumer Goods

Seamless Metal-Plastic Integration in One Go

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Material Selection For Insert Molded Parts

Insert molding often requires the use of a kind of plastic material and another metal or other material used for the inserted part.

Main Materials

Choose the main material for your injection molding product

We are well-versed in hundreds of plastics or other materials for injection molding, including single materials, mixed materials, modified materials, rubbers, etc. We are familiar with their physical properties, chemical properties, and all parameters.

Also, because of the strength of our supply chain system, we can obtain these raw materials in a timely and stable manner without any impact on your product delivery.

Brass

Aluminum

Steel

Plastic

Ceramic

Glass

Inserted Materials

Dare to imagine, dare to insert

Insert injection molding is generally most commonly used for the insertion of screws or studs, brass will not rust and has characteristics of corrosion resistance. It is affordable and easy to process. which makes it the most commonly used material in insert molding.

In addition, copper, aluminum, steel, hard dissimilar plastic parts, ceramics, glass, and plastic can be used as insert materials. In the product application, we will design the shape and structure of plastic parts according to the thermal expansion coefficient of different materials.