Over Molding& Insert Molding
SSP provides insert molding services and custom overmolding in Dongguan, China. Materials, tolerances and validation are reviewed for each assembly before tooling and production.
Related Products
Explore insert-molded connectors, contact assemblies and overmolded components. Use these examples to discuss your own material, geometry and assembly requirements.
Insert-Molded Connectors
Metal contacts integrated into molded polymer bodies.
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Contact Carrier Assemblies
Stamped contacts and molded features on carrier strips.
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Molded Sensor Components
Plastic and metal geometry for sensor assembly projects.
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Connector Contact Modules
Contact locations and molded insulation reviewed together.
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Precision Connector Inserts
Defined insert positions and exposed contact surfaces.
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Terminal Carrier Strips
Repeated terminal features for assembly and production.
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Multi-Material Components
Molded parts combining metal and polymer features.
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Overmolded Components
Grip, sealing and threaded-insert component concepts.
Request a quoteCustom Overmolding & Insert Molding Services
Our insert molding services connect design review, mold manufacture, trial samples and repeat production. Start with your CAD model, resin grade, insert drawing and annual demand. Then identify the interfaces that control fit, sealing or load transfer. For the wider process, see our injection molding services.
Over Molding
Combine a rigid substrate with a molded polymer layer for grip, protection or sealing features. SSP reviews the material pair, hardness, interface geometry and parting line to build a practical overmolding route.
Explore details →Insert Molding
Integrate metal contacts, threaded inserts or other prepared components into molded plastic. Our review connects insert orientation, locating features, exposed surfaces and retention requirements with the finished assembly drawing.
Explore details →Multi-Shot Molding
Review multi-material or multi-color designs for the appropriate shot sequence and tool concept. We assess transfer overmolding and multi-shot options against geometry, material compatibility and production demand.
Explore details →Medical Application Review
Develop component requirements around intended use, material evidence, cleaning and traceability. Medical projects require agreed application-specific validation and documentation before production release.
Explore details →Automotive Components
Bring sensor housings, connectors and technical components into a coordinated tooling review. Define heat, fluids, vibration and assembly loads alongside the customer’s approval and inspection requirements.
Explore details →Connector Insert Molding
Review terminal position, electrical clearance, insulation walls and insert support together. Define the required sealing, electrical and assembly checks so tool design follows the connector’s actual function.
Explore details →Multi-Material Product Portfolio
This gallery illustrates multi-material designs and SSP's wider tooling portfolio. Use it to discuss geometry, finishes and manufacturing scope rather than as evidence of measured performance. For insert molding services, send the actual component drawing and identify its functional interfaces. Gallery illustrations do not establish a medical approval or tolerance guarantee.
Molding Tolerances & Validation
Define part requirements before selecting a process. Tool machining accuracy is different from the dimensional capability of a finished plastic assembly. Resin shrinkage, geometry, cooling and insert restraint all matter. ISO 20457 addresses plastics molded-part tolerances and acceptance conditions; agree the applicable edition and drawing requirements.
Project Specification Checklist
| Feature | Input Needed | Acceptance Basis |
|---|---|---|
| Part dimensions | Approved drawing | Agreed tolerances |
| Insert location | Datum & fit | Position check |
| Interface retention | Load & geometry | Agreed test |
| Resin selection | Exact grade | Supplier data |
| Thermal exposure | Use conditions | Trial evaluation |
| Surface finish | Cosmetic faces | Approved sample |
| Documentation | Report scope | Order agreement |
What Determines Bond Strength?
For custom overmolding services, bond strength depends on the substrate, overmold grade, interface geometry and processing conditions. Specify the test method, specimen geometry and acceptance limit with your drawing. A peel test and a tensile test measure different responses. Accordingly, insert molding services should use application-specific trial results rather than an unsupported blanket strength figure.
How Is Heat Exposure Reviewed?
Review the assembly's operating temperature, exposure duration and heating or cooling cycles. Different materials can expand and shrink differently, affecting residual stress and fit. Define the trial and conditioning requirements for your use case. Any thermal cycling claim must identify the test conditions, sample quantity and acceptance criteria in the report.
How Are Inserts Located?
Define insert position from functional drawing datums and identify surfaces that must remain exposed. Tool locators should restrain the insert during filling without damaging it. Then check displacement, flash and surrounding wall thickness on trial samples. Agree the measurement method and tolerances for the finished part before releasing insert molding services into production.
Is Medical Compliance Automatic?
Medical compliance depends on the intended use and finished component, not just a resin label. The FDA biocompatibility guidance considers contact type and duration. Specify biological evaluation and sterilization requirements separately. A quality-system certificate does not replace application testing or establish that a device is approved.
Product Engineering, Built Around Function
Turn component requirements into tooling and inspection decisions. These examples show what SSP reviews with your engineering and purchasing teams.
| Component | Engineering focus | Approval evidence |
|---|---|---|
| Insert-molded connectors | Contact pitch, exposed surfaces, insulation walls and terminal movement during filling. | Position measurements and agreed electrical or assembly checks. |
| Threaded inserts & mounting parts | Insert orientation, plastic cover, anti-rotation geometry and load direction. | Specified pull-out or torque test on representative parts. |
| Overmolded grips & sealing features | Substrate support, elastomer grade, hardness, interface retention and flash boundaries. | Approved appearance and application-specific bond or sealing tests. |
| Sensor & technical housings | Assembly datums, insert protection, shrinkage and environmental exposure. | Dimensional report and agreed fit or functional evaluation. |
From Drawing to Repeat Production
A connected service from DFM and insert positioning to mold manufacture, sample approval and repeat supply. Each handover has a defined engineering output.
DFM & Interface Engineering
Review the drawing, resin pair, insert datums and functional surfaces. Resolve wall thickness, retention geometry, draft and flash risks before tooling.
Reviewed drawing and DFM actionsMold Design & Precision Tooling
Develop the cavity, insert location, shut-offs, gating and cooling around the component. Confirm loading access and replaceable wear features.
Approved mold and insert-location concept
Trial Molding & Sample Validation
Evaluate filling, insert movement, bond or retention, appearance and assembly fit. Record measurements and corrections against agreed acceptance criteria.
Trial samples and inspection findingsControlled Production
Release the approved drawing, material grades, sample reference and inspection plan together. Control insert handling and review changes before repeat manufacture.
Approved production configurationInspection & Delivery
Check critical dimensions, exposed contacts, flash and agreed functional features. Prepare the inspection records, identification and packaging specified in the order.
Released parts and agreed documentationResins & Tooling Materials
SSP's injection molding page lists more than 50 resin materials for review. The cards below also include tool steels used to build molds, so they are not all molded resins. Confirm the exact grade, supplier data, availability and process compatibility before quoting insert molding services. Conventional PTFE grades, for example, require a different processing review from melt-processable thermoplastics.
Applications for OEM Components
Our insert molding services support application reviews for medical, automotive, electronics and industrial components. Each sector has different functional and documentation needs. Identify the intended use, critical dimensions and approval requirements early. Select the material and manufacturing route around those needs, then validate the final assembly under agreed conditions.
Surgical & Medical Devices
For medical handles and device housings, specify skin or patient contact, contact duration and cleaning conditions. Overmolding can provide grip or integrated features, but a soft-touch surface does not establish biological safety. Agree resin evidence, sample preparation and finished-part evaluation with the responsible device team before manufacturing approval.
Sensor Housings & Connectors
For automotive sensor housings, insert molding services can integrate contacts or mounting features into a polymer body. Specify position, retention loads, fluids and thermal exposure. Review dimensional stability and assembly fit on trial samples. Any ingress, vibration or environmental claim needs a defined test and an acceptance report for that design.
EMI-Shielded Components
For electronics, distinguish insulation, shielding and environmental sealing requirements. Insert molding can locate conductive contacts while forming the surrounding housing. However, electrical continuity, clearance and sealing should be evaluated separately. Identify the mating components and operating conditions so the trial and inspection plan tests the actual assembled function.
Engineering Expertise for Multi-Material Parts
Services Engineering Expertise
Material Science Mastery
Review substrate and overmold grades, surface condition, shrinkage and retention geometry together. Trial evaluation follows the interface function and the agreed acceptance test.
CMM & Dimensional Inspection
Check molded geometry and insert position from defined drawing datums. Select CMM, optical or other measurement methods to suit feature size and access.
Quality & Documentation Review
Agree material records, dimensional reports, sample approval and any external testing at quotation. Product-specific evidence is defined separately from the quality system.
Rapid DFM Turnaround
Plan drawing approval, material procurement, tooling, trial inspection and correction rounds as separate milestones. Confirm the schedule for the actual component.
Product Manufacturing Expertise
Mold Components & Tooling
SSP combines CNC machining, EDM and grinding within its tooling portfolio. Review cavity details, shut-offs, insert support and the functional finish for the mold.
Tool Steel Selection
Select steel and treatment against resin wear, production demand and maintenance. Confirm the grade, hardness and required verification in the tooling specification.
Serial Production Scalability
Separate prototype, first-order and annual requirements. Review cavity count, insert loading, inspection frequency and repeat-order demand when defining the production route.
Full Traceability & Documentation
Link the drawing revision, resin and insert identification to sample approval and inspection records. Agree document retention, packaging and change control for repeat supply.
Production Controls That Matter
Quality planning follows the finished component. Define the characteristics to measure and the records to retain before production begins.
Insert location
Check orientation, datum position and exposed functional surfaces.
Material interface
Review grade compatibility, mechanical retention and application tests.
Tooling & dimensions
Connect mold details, shrinkage and measurement datums to the drawing.
Repeat supply
Control revision, approved samples, inspection records and packaging.
Prepare a Complete Technical RFQ
Send the information below so SSP can review tooling, sampling and production as one scope.
Request a quote →- CAD & drawing
- 3D model, 2D drawing, revision and critical tolerances.
- Materials & inserts
- Resin grades, hardness, insert drawing, finish and supply responsibility.
- Function & approval
- Bond, retention, sealing, electrical or appearance requirements and test criteria.
- Volumes & delivery
- Trial quantity, first order, annual demand, destination and required date.
Discuss Your Overmolding or Insert Molding Project
Request insert molding services with your CAD model, dimensioned drawing, substrate or insert specification and expected demand. Identify finish, function and any required test reports. Define the scope of custom plastic overmolding and metal insert molding services in your request. SSP's stated quote-response target is within one business day; tooling completion, validation and dispatch dates are confirmed separately in your project quotation.
ISO 9001:2015
SSP states an ISO 9001:2015 quality system. Confirm the current certificate scope and project inspection documents for insert molding services; specialist product approval or medical testing must be agreed separately.
Quote Response Target
SSP's injection molding page states a 24-hour quote-response target. Send complete drawings and requirements; confirm the DFM scope and delivery schedule in the written quotation.
Global Shipping
SSP's injection molding page describes worldwide delivery by air or sea. Agree packaging, shipping terms, customs documents and destination requirements before the order is released.
Dedicated Team
Identify a project contact and the drawing revision for approval. Agree technical questions, sample review, change control and repeat-order requirements from quotation through production.