Insert Injection Molding Service

Insert injection molding involves placing pre-made components, like metal parts, into a mold and then injecting plastic around them. It creates strong, integrated assemblies commonly used in industries such as automotive and electronics for enhanced mechanical properties and functionality.
  • Insert Materials: Metals: Stainless steel, brass, aluminum, and nickel-plated carbon steel are famous for their strength and durability. Plastics: High-performance plastics like PEEK or nylon can be used for inserts when chemical resistance or insulation is required.
  • Injection Molding Materials: Thermoplastics: Commonly used plastics include ABS (Acrylonitrile Butadiene Styrene), polypropylene (PP), polyethylene (PE), polycarbonate (PC), and nylon. These materials are chosen for their moldability, strength, and durability.
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When Use Insert Molding Manufacturing Process

Learn when insert molding is the optimal manufacturing process. Embed metal inserts or encapsulate pre-assemblies into plastic parts to improve strength, aesthetics, and functionality while lowering assembly costs.
When Use Insert Molding Manufacturing Process
  • Metal threaded inserts: Enable plastic parts to have screw-machined threads. Benefits include improved strength/wear resistance and ability to assemble components.
  • Electrical components: Encapsulate connectors, sensors, or circuit boards within plastic housing. Protects electronics and facilitates assembly.
  • Fluid connectors: Mold fluid or pneumatic fittings into plastic parts like valves and pumps. Leak-proof and improves reliability.
  • Multi-material handles: Combines hard and soft plastics for ergonomic grips on tool handles. Improves comfort and control.
  • Consolidated assemblies: Inserts allow multiple components to be integrated into a single part, reducing assembly steps, labor costs, and potential defects.
  • Improved Aesthetics: Decorative films and branding inserts can be molded into plastic parts for customized, high-quality surface effects.
  • Enhanced Strength: Metal, carbon fiber, or other inserts molded into plastic can reinforce the part in strategic areas and improve wear resistance.

Insert Molding vs. Overmolding

Though similar, overmolding and insert molding use different techniques to integrate multiple materials into plastic parts. Learn how these two multi-material molding processes differ in terms of part design, tooling, and manufacturing advantages.


Insert Molding


Max custom part size

200×200×80 mm
7.8×7.8×3.1 in.

2000×2000×500 mm
79×79×40 in.

Min custom part size

1×2×2 mm
0.04×0.08×0.08 in.

1×3×3 mm
0.04×0.12×0.12 in.

Min wall thickness

0.4 mm
0.012 in.

0.6 mm
0.02 in.

Max wall thickness

6 mm
0.2 in.

8 mm
0.3 in.

Min net weight

0.1 g

0.3 g

Cost effective Max weight

≤ 50 g

≤ 5000 g

Max net weight

250 g

15000 g

Precision design reference

0.3 % part size

0.4 % part size

Min tolerance

± 0.02 mm

± 0.06 mm

Cost effective MOQ



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Custom Parts Gallery

Discover a wide range of custom insert molding parts through our visually appealing gallery.

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