Using value-added lean methodology paired with our highly skilled, cross trained staff, we are able to quickly manufacture a complete product build. By incorporating our level of efficiency with a customer’s product vision, we guarantee steady business flow while ensuring high quality results.

GEM’s vertically integrated manufacturing capabilities combined with our strong global supply chain provides our customers with the broadest offering of contract manufacturing services of complex electro-mechanical systems, subsystems and component fabrication.


Our goal is to enhance our customers’ experience by increasing their level of efficiency and production through the use of specialized, automated equipment. Our in-house expertise in intelligent machine design and build allows us to integrate precision robotics, vision systems, data acquisition and product traceability into cost-effective processes, machines and assemblies.

GEM applies lean manufacturing principles to engineer and build highly automated, lean manufacturing assembly, and QC testing lines and material handling cells to produce your product.


GEMCITY is an expert contract manufacturer, which means we can assemble most any component you may need to get your product to market. This includes a variety of wire harnesses and cable assemblies that can be built with a variety of terminations and connectors.

We can produce flat and round-flat ribbon cable, discrete wire, coaxial/triaxle cable, composite and multi-conductor cable. Our capabilities include high and low voltage cable harness assemblies, light-to heavy-gauge wire harnesses, or anything in between. From a simple wiring harness to a more complicated assembly, GEMCITY will keep your project on time and on budget.


GEMCITY has extensive experience in systems integration, box build, final assembly and testing of a variety of control and monitoring products.

Our world-class facility in Mentor, OH is a dedicated manufacturing facility for production of upper level and final assemblies. This facility is set up with individual work cells designed for the unique requirements of each product. The entire process utilizes lean manufacturing principles to achieve the highest levels of quality and efficiency. Within these cells, we perform a wide variety of electromechanical assembly operations, final systems testing and custom packaging to create a complete start-to-finish custom manufacturing solution.