Capability

Cable Insert Overmolding

MTTJ uses vertical insert molding to add a protective shape around connector exits, breakouts, cable stops, glands, and junctions. The work covers insert preparation, molding, trimming, appearance checks, and electrical checks.

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Black cable assembly with overmolded strain relief and a round connector feature

Geometry, material, tooling

What connector or cable exit needs strain relief?
Is the overmold geometry already specified in a drawing?
Which material, hardness, color, or marking is required?
Does the part need a gland, stop, breakout, Y junction, or T junction?

Dimensions needed for a tooling check

Connector, cable, and molded geometry from drawing, sample, sketch, or 3D view
Material hardness, color, marking, tooling need, and quantity
Validation target for sealing, pull, mechanical, or electrical checks with method and pass/fail limits

Inspection

What is checked after molding

The molded envelope, cable exit, material, flash, surface, marking, and any specified sealing feature are checked against the drawing or reference sample.

Geometry	Drawing, 3D model, sample, or sketch specifies molded shape and cable exit.
Material	PVC, PU / TPU, TPE, silicone, or another project-specified material is checked against the application and processing requirements.
Sealing	IP, airtightness, or waterproof targets are built around the requested level, fixture idea, and validation method.

Process examples

Visible process details tied to RFQ inputs

These images show where drawings, dimensions, connector details, materials, tests, and records affect the manufacturing step.

Cable insert molding setup with cable positioned in a fixture — Insert molding process setupFixture setup is planned from connector position, cable exit, molded envelope, and any supplied validation method.

Overmolded cable grommet detail on a black cable — Molded grommet detailMolded cable exits, grommets, stops, and strain-relief shapes need drawing geometry plus any supplied validation method.

Black molded strain-relief part on a light background — Molded strain‑relief partMolded component shape, material hardness, surface finish, and marking need to be fixed before repeat builds.

Close view of black overmolded cable exit and strain relief — Molded cable exit detailClose-up cable exit helps align visual inspection with drawing geometry and supplied pass criteria.

In‑house process

Insert molding in the Tianjin factory

Cable and connector preparation, insert loading, vertical molding, trimming, appearance checks, and electrical checks can be completed in-house.

Vertical overmolding / insert molding
Wire cutting
Wire stripping
Terminal crimping
Soldering
Electrical testing

Tooling and tests

New cavities, sealing targets, fixtures

A new cavity, unusual hardness, mixed cable diameters, sealing targets, or dedicated fixtures need separate engineering work before sampling.

Qualified-supplier coordination

Horizontally injection-molded housings requiring horizontal molding machines
PCB assemblies / circuit boards
Specified plug, connector, or component sourcing

Process

From prepared insert to finished molded cable

The connectorized insert is loaded into the tool, molded, cooled, trimmed, and checked against the released geometry.

1Read the drawing, connector, cable, and application requirements
2List material preference, geometry, and tooling requirements
3Prepare cable and connector subassembly
4Run vertical insert molding or overmolding workflow when suitable
5Inspect molded geometry, run electrical tests

Related routes

Products using overmolding

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Send the molded geometry

A drawing or 3D view should show the insert, cable exit, molded envelope, material, and any pull or sealing requirement.

Start an RFQ