Types of industrial
maintenance jobs.

A millwright is a skilled tradesperson who installs, dismantles, repairs, and precision-aligns heavy industrial machinery. Where a maintenance technician keeps a running plant running, millwrights specialize in the machinery itself — moving a 20,000-lb press into place, aligning a motor and pump to within thousandths of an inch, leveling and anchoring new production lines. The trade dates back to the craftsmen who built water-powered mills, which is where the name comes from (and no, it's not spelled "millright").

Day to day: Rigging and setting equipment, laser and dial-indicator shaft alignment, rebuilding gearboxes and rotating equipment, welding and fabricating mounts, and heavy involvement in plant shutdowns and equipment installs. Many millwrights work for industrial contractors and travel between plants; others hold in-plant maintenance millwright roles.

How people get in: Union apprenticeship (3–4 years) or in-plant progression from mechanic roles. Rigging certs and precision-alignment experience move pay fastest.

A good fit if: You like big mechanical work, precision fits, and projects with a visible finish line.

An industrial maintenance technician is the generalist who keeps production equipment running — part mechanic, part electrician, part troubleshooter. It's the most common job title in plant maintenance and the default entry point into the field. "Multi-craft" in a posting means the employer explicitly wants both electrical and mechanical skills in one person.

Day to day: Scheduled preventive maintenance (lubrication, belts, bearings, inspections), responding to breakdowns on production lines, electrical troubleshooting to the component level, and working orders in a CMMS. The variety is the point: a shift can move from a hydraulic leak to a motor-starter fault to a jammed conveyor.

How people get in: Tech school certificate, operator-to-tech progression, or adjacent experience (auto/diesel, military maintenance). See our full guide to becoming a maintenance tech below.

A good fit if: You want variety, constant learning, and the widest set of open doors in the trade.

A maintenance mechanic is the mechanically-focused end of the technician role: pumps, gearboxes, conveyors, bearings, chains, and hydraulic and pneumatic systems. Postings for "mechanical technician" or "machine repair" usually describe the same job. In practice the line between mechanic and technician is blurry — the mechanic title just signals that mechanical depth matters more than electrical breadth.

Day to day: Rebuilding pumps and gear reducers, replacing bearings and seals, tensioning and tracking conveyors, hydraulic troubleshooting, and PM routes. Strong mechanics who add electrical skills typically re-title into multi-craft or lead roles — and pick up the pay bump that comes with it.

How people get in: The most accessible entry title for people with hands-on mechanical backgrounds — auto and diesel techs convert well here.

A good fit if: You think in mechanisms — you want to know why the bearing failed, not just swap it.

An industrial electrician installs, maintains, and troubleshoots a plant's electrical systems — three-phase motors, motor control centers, variable frequency drives, transformers, and the control wiring that runs automated equipment. It's a different world from residential or commercial electrical work: less conduit and receptacles, more troubleshooting live production equipment under time pressure.

Day to day: Tracing faults with prints and a meter, replacing motor starters and drives, running conduit for equipment installs, PM on electrical distribution, and increasingly, first-line PLC troubleshooting. In many states the role requires or strongly prefers a journeyman electrician license, which is also what pushes pay toward the top of the range.

How people get in: Electrical apprenticeship (IBEW or ABC), journeyman licensure, or electrical tech school plus in-plant experience. The license is the durable credential — it follows you across employers and states.

A good fit if: You want a licensed trade with a clear progression and some of the strongest pay leverage in maintenance.

A controls technician troubleshoots the automation layer of a plant: PLCs, HMIs, sensors, drives, and industrial networks. Instrumentation techs do the same for process measurement — flow, pressure, temperature, level — and the roles frequently merge into "E&I" (electrical and instrumentation) in process industries. This is the hardest set of skills for plants to hire, which is why controls roles consistently top the hourly pay table.

Day to day: Going online with a processor to trace a fault through ladder logic, replacing and configuring sensors and drives, calibrating instruments, supporting equipment installs and upgrades, and being the person everyone calls when the machine faults and nobody knows why.

How people get in: Usually reached from electrician or technician roles plus PLC coursework (Allen-Bradley Studio 5000 and Siemens dominate US plants). Mechatronics programs are a direct route in.

A good fit if: You like logic, systems, and puzzles more than wrenches — and you want the top of the hourly pay scale.

Industrial HVAC/R techs maintain the big thermal systems plants depend on: chillers, cooling towers, boilers, compressed air, and — in food and beverage — industrial ammonia refrigeration, a specialty with its own certifications (RETA) and a chronic shortage of qualified people.

Day to day: PM and repair on chillers and cooling towers, refrigerant handling (EPA 608 is the legal entry ticket), boiler maintenance, and 24/7 on-call coverage in cold-chain facilities where a refrigeration failure can cost a warehouse full of product.

How people get in: HVAC school plus EPA 608 gets you in; ammonia experience and RETA credentials move you into the best-paid refrigeration roles.

A good fit if: You want a specialty that's in demand in every food, beverage, and cold-storage plant in the country.

A reliability technician works on preventing failures instead of fixing them: vibration analysis, thermography, oil analysis, and ultrasound to catch failing equipment weeks before it breaks. It's the analytical wing of the maintenance department and a common step toward reliability engineering and planning roles.

Day to day: Collecting and interpreting vibration routes, thermal imaging of electrical gear, tracking failure data, root-cause analysis after major breakdowns, and building the case for fixing chronic problem equipment.

How people get in: Usually promoted from senior technician roles; vibration analysis certification (Cat I/II) and the SMRP's CMRT credential are the recognized markers.

A good fit if: You like data and detective work, and you'd rather prevent the 2 AM call than answer it.

A maintenance welder handles the repair welding and fabrication a plant generates every day: cracked frames, worn wear plates, broken brackets, guards, and the endless custom parts that aren't on any shelf. The role often blends into millwright and mechanic work — many postings want a mechanic who welds.

Day to day: Stick and MIG repair welding (often in-place, in awkward positions), fabricating from prints or from a sketch on a napkin, torch and plasma cutting, and supporting shutdowns where the repair backlog gets burned down.

How people get in: Welding school or field experience; an AWS D1.1 structural cert matters for millwright-leaning and contractor roles.

A good fit if: You want to build and repair with your hands and see your work holding the plant together.