overmold & insert-molded components
Built for accurate metal-to-plastic positioning, retention, and repeatable assembly.
Gromax manufactures precision stamped metal inserts designed for integration into plastic housings, connectors, switches, sensors, controls, and other molded assemblies.
We review insert geometry, material, plating, carrier design, retention features, molding conditions, exposed interfaces, and dimensional requirements to support stable positioning before, during, and after molding.
part examples
Insert-Molded Terminals
Stamped conductive terminals positioned within plastic housings to create electrical connection points, mating interfaces, or wire-termination features.
Sensor Inserts
Precision metal inserts used to locate and electrically connect sensing elements, terminals, or internal conductors within molded sensor housings.
Connector Inserts
Stamped pins, blades, terminals, or contact arrays designed to remain accurately positioned during molding and form the conductive interface of a connector.
Switch & Control Inserts
Formed metal components integrated into molded switch, relay, control, or actuator housings for electrical connection, retention, or mechanical function.
Stamped Busbar Inserts
Conductive stampings overmolded or insert molded into insulated housings for compact power distribution and protected electrical routing.
Structural & Retention Inserts
Stamped metal features used within molded parts to provide reinforcement, fastening points, alignment, or mechanical retention where metal properties are required.
Not sure where your part fits?
part design essentials
Reliable insert-molded performance depends on how the stamped metal geometry, molding process, plastic material, and final assembly interact.
Insert Position & Stability
Critical metal features must remain properly located during mold loading, clamping, and resin flow so exposed terminals, pads, or mechanical interfaces end up in the intended position.
Retention Geometry
Holes, slots, barbs, undercuts, shoulders, tabs, embossments, or textured features can improve mechanical interlock between the insert and molded plastic when appropriate for the design.
Material & Plating
Conductivity, strength, formability, corrosion resistance, solderability, contact requirements, and molding temperature influence material and finish selection.
Carrier & Handling Features
Carrier strips, indexing holes, tie bars, and temporary support features can help maintain spacing and orientation through stamping, plating, automated loading, and molding.
Plastic Flow & Encapsulation
Insert shape can affect resin flow, knit lines, void formation, local stress, and encapsulation, so the metal geometry should be reviewed together with the mold and plastic-part design.
Thermal & Mechanical Interaction
Differences in thermal expansion, molding temperature, insert stiffness, and plastic shrinkage can affect stress, position, and long-term fit around the metal insert.
from DfM to Production
Gromax supports insert-molded component programs from stamped insert review through repeatable production.
Part & DfM Review
Review the metal insert drawing, molded-part interface, material, thickness, retention features, exposed contact areas, tolerances, plating, and production volume.
Progressive Die Design & Build
Develop tooling for required piercing, blanking, coining, embossing, bending, forming, carrier creation, and cutoff operations.
Precision Stamping & Forming
Establish a repeatable process around insert position, terminal spacing, formed relationships, retention geometry, and molding-critical dimensions.
Plating & Pre-Mold Processing
Incorporate selective or overall plating, cleaning, deburring, heat treatment where applicable, and other preparation required before molding.
Molding Integration & Production Support
Support carrier configuration, insert handling, dimensional review, tool maintenance, process troubleshooting, root-cause analysis, and corrective action for ongoing programs.
quality & assembly fit
Inspection should verify the characteristics that determine whether the insert loads, molds, and functions correctly in the finished assembly.
Insert Geometry
Length, width, thickness, profile, straightness, and critical formed dimensions.
Positioning Features
Carrier pitch, index holes, locating tabs, shoulders, and other features used to control insert placement.
Retention Features
Holes, slots, barbs, embossments, tabs, or formed sections that influence mechanical interlock with the molded plastic.
Exposed Interfaces
Terminal position, contact surfaces, mating geometry, plating coverage, and dimensions that remain accessible after molding.
Molded Assembly Fit
Final insert position, encapsulation, exposed length, alignment, retention, and fit with mating connectors, boards, housings, sensors, or other components.
Gromax checks critical dimensions using standard measurement, fixtures, optical inspection, custom gaging, or functional inspection methods and reviews your certification, traceability, and inspection documentation needs.
Have an Overmold or Insert-Molded Component You’d Like Us to Review?
Developing a new molded assembly or evaluating another stamped-insert source? Tell us about the application, insert material, thickness, plating, retention features, molding process, production volume, and the positioning, retention, or assembly issue you need to resolve.
Do not include Controlled Unclassified Information (CUI), ITAR-controlled technical data, or EAR-controlled export-controlled information in your initial email or RFQ submission.
If your request involves export-controlled or regulated technical data, note that in your message and we’ll provide secure transmission instructions.
Customer Confidentiality
& Export Control Notice
To protect customer confidentiality and controlled technical information, Gromax does not publicly display customer-specific drawings, specifications, or sensitive part details without appropriate authorization.
Images shown are illustrative only and are used to represent the types of parts, geometries, and manufacturing capabilities Gromax supports. They do not depict specific customer designs or proprietary technical data.