As products become increasingly sophisticated, manufacturing requirements often extend beyond electronics assembly alone. Many applications require a combination of precision metal fabrication, plastic components, cable harness assemblies, and electromechanical integration.
For OEMs, this raises a practical question: how many separate vendors does it take to get a product from a concept sketch to a finished, certified system? The answer shapes everything from lead times to quality control.
At Tohoku Solutions, part of the SVI group, vertical integration brings together plastics, precision metal fabrication, cable harness assembly, and EMS capabilities within one manufacturing ecosystem — enabling OEMs to engage at the component, subassembly, or complete system level. It is a clear, practical example of what vertical integration looks like in action.
Vertical integration refers to a manufacturing model where complementary capabilities — plastics, metal fabrication, cable harness assembly, and full electronics manufacturing services (EMS) — sit within one organization rather than across several vendors. Instead of an OEM coordinating plastics from one supplier, metal fabrication from another, and EMS from a third, a vertically integrated partner can manage components, subassemblies, and complete systems within a single ecosystem, under one quality standard.
The sections below look at how this plays out at Tohoku Solutions — the capabilities involved, how OEMs can engage with them, and what this means for both SVI’s global manufacturing network and Tohoku Solutions’ direct customers.
Not every OEM needs a complete EMS solution from day one.
Some OEMs may simply need:
Others may require complete system integration and global manufacturing support.
A vertically integrated manufacturing ecosystem can support both.
Within the SVI group — a global EMS provider with six production sites across five countries — Tohoku Solutions sits alongside facilities that together give SVI strong EMS capabilities — PCBA, box build, and system assembly — spanning multiple regions. Tohoku Solutions adds a complementary layer to that strength: alongside EMS, it also operates plastic injection molding, precision metal stamping, and cable harness assembly in-house.
That distinction matters because plastics, metal fabrication, and cable harness assembly typically happen upstream of EMS in a product’s build. Having both stages available within Tohoku Solutions gives OEMs the flexibility to manage that journey within one site — or to continue working with their preferred upstream suppliers and bring the product to Tohoku Solutions for EMS, system integration, or both. Either way, the option to consolidate is there when it adds value.
Tohoku Solutions also holds IATF 16949 (Automotive Quality Management), ISO 9001 (Quality Management), ISO 14001 (Environmental Management), and ISO 45001 (Occupational Health & Safety) certifications. These standards originated in automotive manufacturing, where tolerances are tight and traceability requirements are strict, and the same discipline now applies across its plastics, metal, and electronics processes.
Across the SVI group, customers can draw on:
Through Tohoku Solutions, that list extends upstream to include:
Combined, these capabilities let an OEM move from individual plastic and metal components all the way to a fully assembled, tested electronic product — within the SVI group.
An OEM can work with Tohoku Solutions at whatever stage fits its product — a single component, a subassembly, or a full manufacturing solution — without that choice limiting what comes next.
The clearest way to see the value of vertical integration is to follow a product through its lifecycle.
A new product often starts small — a plastic enclosure, a cable harness assembly, a mechanical bracket. As volumes grow and the design matures, requirements typically expand into mechanical subassembly, then PCBA and box build, then full system integration. Within a vertically integrated site, that growth can happen inside one relationship, under one quality system, with records carrying through from the first component to the finished product — offering OEMs a convenient option as their needs scale.
For OEMs evaluating manufacturing partners, this points to a few practical benefits:
Plastics, metal fabrication, and cable harness work can happen under the same quality system as the electronics build, giving OEMs a consistent standard to rely on from the first component to the finished system.
When mechanical and electronics teams sit within one organization, a design change on one side can be evaluated against the other side’s constraints in days rather than weeks.
A product can move from prototype to higher-volume production while staying within the same manufacturing relationship, giving OEMs continuity as their requirements scale.
An OEM does not need to commit to a full EMS relationship to benefit from a vertically integrated site. The same model that supports a complete product can equally support a single plastic component or cable harness, with the option to expand later if the product calls for it.
While Tohoku Solutions supports SVI’s global manufacturing network, its capabilities are not limited to internal use. Tohoku Solutions also serves direct customers seeking specialized manufacturing services in their own right. Some work with Tohoku Solutions solely for plastic components, metal fabrication, or cable harness assemblies; others build on that relationship over time to include broader EMS and system integration programs. Either way, the same vertically integrated model is available — whether a customer’s need is narrow and specific or broad and long-term.
When mapping out a product’s manufacturing journey, it can help to consider how many of these capabilities — plastics, metal fabrication, cable harness assembly, and EMS — are available within a single site, and how that availability supports the product as it moves from design through volume production. This is one of several factors, alongside cost, location, and relationship fit, that OEMs weigh when planning their manufacturing strategy.
At SVI, Tohoku Solutions illustrates what this looks like in practice — one part of a global manufacturing network that gives OEMs options for how their product takes shape, working alongside SVI’s other production sites and trusted supplier partners.
Vertical integration is not simply about having more processes under one roof. It is about creating more possibilities for OEMs — whether they need a single component, a complex subassembly, or a complete manufacturing solution, and whatever combination of internal teams and trusted suppliers gets them there. Tohoku Solutions, alongside SVI’s other production sites, is one example of how that flexibility can take shape across a product’s manufacturing journey.
See how vertical integration connects Tohoku Solutions to SVI's global manufacturing network in the Vertical Integration Guide. Have a specific project in mind? Contact us to talk it through.