Insert Molding Solutions

What is Insert Molding?

Precision Engineering for Complex Applications

Insert molding is a type of injection molding that forms plastic around an insert placed in the mold before injection. Inserts can be metal or other materials and are used to add strength, threaded fastening points, electrical contact surfaces (when applicable), or structural reinforcement. The result is a single, integrated component designed to reduce assembly complexity and improve long-term performance.

How Insert Molding Works

Step-by-step overview

• Part + insert evaluation to confirm insert type, location, and performance requirements
• Material selection based on mechanical needs, temperature exposure, and environment
• Tooling strategy designed to support stable insert placement and repeatable geometry
• Insert placement (manual or automated depending on the application)
• Injection and molding to form a secure bond around the insert
• Cooling, ejection, and inspection based on required tolerances and quality checks

Insert Molding Applications

Insert molding is commonly used when parts need embedded fastening points, improved strength, or integrated subcomponents. It is especially useful for components that would otherwise require secondary assembly, adhesives, or multiple fastening steps.

Common insert types

• Threaded inserts
• Bushings, pins, and sleeves
• Custom metal components or reinforcement elements

Common part examples

• Housings and enclosures with embedded fastening points
• Brackets and structural supports
• Wear-prone components requiring reinforcement
• Components that benefit from reduced assembly steps

Benefits of Insert Molding

• Fewer manufacturing steps by integrating inserts during molding
• Improved reliability with stronger retention and consistent placement
• Better performance for parts exposed to vibration, stress, or repeated fastening cycles
• Cost efficiency by reducing labor, fasteners, and secondary operations