Northern Manufacturing runs mechanical assembly in dedicated assembly and fit-up bays inside our 160,000 sq ft Oak Harbor, Ohio facility, with 90,000 sq ft of outdoor laydown behind it for staging and crating. Our craftsmen build bolted structures, set shafts, bearings, and couplings, mount motors, pumps, and gearboxes, plumb pneumatic systems and actuators, and install gaskets, seals, and insulation, working from your drawings and bill of material under the same ISO 9001:2015 quality system that fabricated the parts (certified by AVU Registrations, IAS-accredited, certificate #00157-4).
The scope boundary is honest and simple: mechanical only. We do not perform electrical wiring or controls assembly. What we ship is a mechanically complete, dimensionally verified unit, fabrication, assembly, and final testing handled start to finish under one roof.
From Fabricated Parts to Working Assemblies
Most of what leaves our weld floor is destined to become part of a machine: a frame that carries a drive, a housing that holds a rotating drum, a hopper that feeds a conveyor. Shipping those as loose fabrications moves the integration risk onto your dock. Assembling them here keeps the risk where the parts were made, with the people who made them.
| Component class | Examples | What we do |
|---|---|---|
| Structures and fastening | Frames, guards, platforms, bolted joints | Assemble per drawing with specified hardware |
| Rotating elements | Shafts, bearings, couplings | Install and align so rotation matches design intent |
| Drives | Motors, pumps, gearboxes | Mount and connect mechanically per the print |
| Actuation | Pneumatic systems, cylinders, actuators | Install and connect, function-checked before shipment |
| Soft goods | Gaskets, seals, insulation | Install at final assembly so the unit arrives closed up |
| Hardware | Customer-supplied or Northern-sourced | Receive, verify against BOM, track through the build |
Complex multi-part sub-assemblies are the normal case here, not the exception. The bays, overhead cranes (four added in the January 2026 expansion), and rigging that handle our largest weldments handle assembled units the same way.
One Vendor From Laser Cut to Final Bolt
Splitting fabrication and assembly across vendors multiplies handoffs, and every handoff is a place where accountability can leak. When a hole pattern does not line up, the fabricator blames the assembler’s sequence and the assembler blames the fabricator’s tolerance, and you referee from a job site.
Putting both under one roof collapses that loop. The craftsman who fit the weldment is across the floor from the one bolting it to its drive. An interface problem found during assembly goes back to the source in hours, with the fixtures, the weld maps, and the people who built the part all still in place. One purchase order, one quality system, one accountable supplier.
Kitting and Kanban Programs
For customers with recurring production needs, we run kitting and Kanban programs: finished fabrications and hardware staged as kits and released against your pull signals instead of arriving as one bulk shipment. Each kit carries what one build station consumes, which cuts the receiving, sorting, and material-handling work on your floor. Program rules, kit contents, and release triggers are agreed up front; the parts inside carry the same documentation as any other Northern fabrication.
How Assembly Work Is Verified
Assembly is a quality gate, not just labor. Verification scales to the job:
- In-process checks under the ISO 9001:2015 system, with hold points where the drawing or your spec calls for them
- FARO laser projectors that project CAD outlines directly onto the work, guiding component placement and catching mislocations before they are bolted in
- Dimensional verification against your model, escalating to Leica AT960 laser tracker measurement on large or critical assemblies
- Trial fit and functional testing as the final gate: mating interfaces proven, moving parts exercised, and leak or hydro testing where the design calls for it
- PMI verification with handheld XRF analyzers when material confirmation on specialty alloys is specified
What Ships With an Assembled Unit
- Material Test Reports (MTRs) traced by heat number for Northern-fabricated components
- Weld maps and NDE reports carried forward from fabrication
- Dimensional verification records, including laser tracker reports when specified
- Functional and trial fit test records for assemblies that ran the final gate
- Hardware and BOM verification records for supplied components
- Certificate of Conformance to your purchase order
If your program needs assembly-level inspection documents we have not listed, our quality department scopes them during quote review, before the work starts, not after it ships.