insert molding over mold metal insert pulley

Custom Insert Molding & Overmolding Expertise

Yixing Plastics has many years of experience as a custom plastic insert molder and overmold specialist. Plastic injection insert molding is a process where thermoplastic material is molded around an insert piece placed in the cavity. Inserts are typically metal, but can also be ceramic or other plastics that withstand injection temperatures.

Yixing Plastics is a trusted custom insert molder with deep expertise in custom insert molding and insert molded plastics.

Applications

Some of the first insert molding applications were for threaded inserts. Today, custom insert molding is widely used in:

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

Benefits

Plastic injection insert molding is an effective alternative to soldering, adhesives, or fasteners:

• Reduced assembly and labor costs – molded as one assembly
• Improved component reliability – inserts are stronger and more durable than plastic, ensuring proper alignment and preventing loosening
• Reduced size and weight – strong, lightweight plastic resin eliminates fasteners
• Enhanced design flexibility – unlimited configurations and material combinations

Yixing Plastics often employs robotic automation for fast and precise insert placement.

From concept to delivery, Yixing Plastics provides OEMs with custom plastic injection molding through early supplier involvement in the design and engineering phase, design for manufacturability, and material selection support.