What Is Insert Molding?
Insert molding is a process in which metal components such as threaded inserts, bushings, pins or contacts are placed into the mold cavity before plastic is injected around them. The result is a single part that combines the strength of metal with the design freedom of plastic, eliminating secondary assembly steps.
Benefits of Insert Molding
- Reduced assembly — metal components are encapsulated during molding, removing separate insertion steps.
- Stronger joints — the insert is locked mechanically or bonded within the plastic for a durable connection.
- Improved reliability — fewer assembly steps mean fewer potential failure points.
- Design consolidation — combine multiple functions into one molded component.
Common Insert Molding Applications
- Threaded inserts for fastening — brass, stainless steel and aluminum inserts
- Electrical connectors and terminals
- Bushings, sleeves and standoffs in plastic housings
- Medical and surgical instrument components
- Automotive electrical and sensor housings
Inserts and Materials We Work With
We handle brass, steel, stainless steel and aluminum inserts combined with engineering plastics such as PA, POM, PC, ABS and PBT. Insert placement, mold protection and cycle time are reviewed during DFM to protect the mold and ensure consistent insert positioning.
Insert Molding at D-top Mould
D-top Mould designs and builds insert molding tools for prototype and production volumes. Our process covers DFM review, insert fixture design, mold protection, and trial validation to ensure inserts are correctly positioned and securely encapsulated in every shot.
What We Need for a Quote
Send your 2D or 3D drawings, insert specifications, plastic material, expected annual volume and tolerance requirements. Our engineering team will respond with a quotation within 12 hours.