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Single-step metal & plastic integration. Reduce assembly steps, enhance structural strength, and cut total manufacturing cost
Precision Insert Molding Manufacturer
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By pre-placing functional inserts such as metal parts, PCBs, and magnets into the mold, then injecting molten engineering plastic, the plastic and inserts form a strong mechanical interlock structure after cooling, resulting in a one-piece component with built-in functional elements.Compared with traditional post-molding assembly processes, it eliminates secondary assembly steps while significantly improving the structural strength, stability, and reliability of the parts. It is widely used in automotive electronics, consumer electronics, home appliances, medical devices, and other industries.
What is Insert Molding?

Insert molding is a highly efficient, integrated injection molding process.

Key Benefits of Insert Molding
Capabilities & Specifications
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Insert Molding Parts Made By KeZi

Every insert molding part will be inspected to ensure compliance with standards.

Industries & Applications
How to Start Insert Molding Project
How to Start Insert Molding Project
1. What is insert molding?

Insert molding is an advanced injection molding process where pre-placed functional inserts (such as metal pins, threaded fasteners, PCBs, or magnets) are encapsulated with molten plastic to form a single integrated part.

2. What is the difference between Insert Molding and Overmolding?

Insert molding involves placing a metal or pre-made component into the mold before plastic injection.Overmolding is a secondary molding process where one material is molded over another substrate.

3. What materials can be used as inserts?

Common insert materials include:

Stainless steel

Brass

Aluminum

Copper

Electronic terminals）

Magnets

Ceramic components

4. What plastic materials are commonly used in insert molding?

Common materials include:

ABS

PC

Nylon（PA）

PBT

TPU

TPE

PP

LCP

The material selection depends on product requirements such as strength,heat resistance,electrical performance,and chemical resistance.

5. How can insert shifting be prevented during molding?

Precise positioning structures

Magnetic fixtures

Vacuum positioning

Robotic loading systems

Optimized injection pressure and gate design

6. What quality checks are performed during insert molding production?

Common checks include pre-production DFM and mold flow analysis, in-mold real-time defect detection, post-molding dimensional inspection, pull-out strength testing for inserts, and sealing/conductivity testing for functional parts.

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