Insert Moulding

Insert Moulding

As a custom plastic insert moulder, we have many years of experience. By moulding thermoplastic material around an insert piece or pieces placed in the plastic injection moulding cavity, a strong, integrated assembly is created that is completely encapsulated by the plastic, resulting in a single strongly bonded, integrated assembly. The inserts can be metal, another plastic, ceramic, or any other material that is able to withstand plastic injection moulding.



Some of the first insert molding applications were for placing threaded inserts into molded parts and encapsulating wire plug connections on electrical cords. Current custom insert molding applications are wide ranging, with few limitations on material combinations, including:

  • Medical devices and instruments, such as needle hubs and tube valves
  • Knobs for appliances, controls and assemblies
  • Encapsulated electronic devices and electrical components
  • Military equipment
  • Threaded fasteners
  • Encapsulated bushings, tubes, studs and posted

Benefits of Insert Molding

Plastic injection insert molding is an effective alternative to assemblies manufactured using soldering, adhesives or fasteners, with benefits including:

  • Reduced assembly and labor costs (Molded as one assembly)
  • Reduced size and weight (Insert molding allows for reduction of part size and weight because parts are joined with strong, light-weight plastic resin and fasteners or connectors are eliminated)
  • Robotic automation in the insert molding process allows for fast and precise placement of inserts
  • Improved component reliability (Insert molding of components ensures proper alignment, prevents loosening and the plastic resin can provide improved resistance to vibration and shock)
  • Improved part strength and structure (Insert molding combines the physical strength of the plastic resin and insert to produce one seamless plastic part)
  • Enhanced design flexibility (Custom plastic insert molding allows for almost unlimited configurations and material combinations)
  • Consolidation of components (Insert molded components enable part and inventory cost reductions)