Insert Molding Services in Canada

Insert Molding in Canada

Insert molding is the assembly-eliminating process. Instead of molding a plastic part and then assembling metal components to it, insert molding combines both operations into a single molding cycle. The result is a finished part with integrated metal hardware — and the elimination of the labour, tooling, and quality cost of post-molding assembly.

Where Insert Molding Wins

Threaded inserts in plastic housings. The single most common use case — brass or stainless threaded inserts integrated into power tool, electronics, and automotive plastic housings.

Electrical lead frames and connectors. Automotive, industrial sensor, and consumer electronics connectors with integrated metal contacts.

Bushings and bearings. Plastic gears and pulleys with integrated metal bushings or precision bearing seats.

Embedded magnets. Sensor housings, switch components, and magnetic-actuation devices with integrated rare-earth magnets.

How It Works

Inserts are loaded into the mold cavity (manually for low volumes, robotically for production). The mold closes, plastic injects around the insert, and the plastic shrinks against the insert geometry to lock it in place. Mechanical features on the insert — knurling, undercuts, hex profiles — create the retention.

Trade-Offs

Cycle time. Insert loading adds time to each molding cycle. Robotic loading minimizes this; manual loading adds 5–15 seconds per cycle.

Tool complexity. Tools have insert-loading provisions, sometimes including pneumatic ejection of mis-loaded inserts.

QA. Mis-loaded or missing inserts are catastrophic. Production cells use vision systems to verify insert presence before each shot.

Canadian Insert Molding Network

Insert molding capacity is concentrated near major automotive (Ontario), electronics (Quebec, BC), and consumer products (Ontario, Quebec) clusters. Our network covers manual-load short-run capability through robotic-load production cells with vision verification.