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Overmolding is a process that forms a sealed plastic shell directly onto a cable, connector, or component. On a cable assembly it does three jobs at once: it relieves strain where the cable meets the connector, it seals out moisture and dust, and it gives the finished part a clean, professional look. And with the right process, it can even be molded over something as sensitive as a circuit board. The point where a cable meets its connector is the spot most likely to fail. Ben

A wire assembly is a set of individual wires terminated to a connector. A cable assembly is cable, wires already bundled in a jacket, terminated to a connector. The practical difference is protection: cable assemblies carry their own shielding for tougher environments, while wire assemblies are used where the surrounding hardware already provides it. Ask three people in this industry to define the difference between a wire harness and a cable assembly and you'll get three ans

IPC/WHMA-A-620 is the industry's shared standard for how wire harnesses and cable assemblies should be built and inspected. It sorts work into three classes by how much reliability the end product demands, and the class on the print decides where the line sits between a connection that's good enough and one that has to be rejected. Somewhere right now there's a wire harness inside a defibrillator, and another one inside a flight control system, and a third inside a kid's toy.

Building wire harnesses in-house looks cheaper on the surface, and for most growing OEMs it isn't. Once you count the tooling, the crimp applicators, the trained labor, the bench space, and the engineering hours pulled off real work, outsourcing to a specialist usually costs the same or less, and it frees up the floor space and the staff you had tied up in building them. A small company often starts out building its own cable assemblies. Early on it makes sense, the volume is

Offshore cable assembly almost always wins on piece price and loses on landed cost. Add tariffs, freight, rework, expedites, and the cost of slow communication, and the number that looked 30% cheaper often lands even with or above a domestic build, and weeks later. A buyer sends the same harness drawing out to three shops for a quote. Two are overseas and come back with a piece price that's hard to argue with. One is forty minutes up the road and quotes higher. On the spreads