# Industrial Mechanic Millwright (433A)

## Fast facts

| Trade code | 433A |
| --- | --- |
| Sector | Industrial |
| Classification | Voluntary trade |
| Certifying exam | Required (O. Reg. 876/21, s. 3) |
| Apprentice to journeyperson ratio | Not subject to a ratio |
| Red Seal trade | Yes |
| Active apprentices in Ontario | 3,614 (reported in Ontario's apprenticeship dataset) |
| Approved sponsors | 1,448 |
| Certifying body | Skilled Trades Ontario |

Last verified August 20, 2026 against the sources listed below.

## What does an industrial mechanic millwright do?

An Industrial Mechanic Millwright works on industrial machinery, mechanical equipment and components, including mechanical, pneumatic, hydraulic, fuel, lubrication, cooling and exhaust systems, and pumps, fans, tanks, conveyors, presses, generators and pneumatic and hydraulic controls.

Skilled Trades Ontario describes the work of this trade as follows:

- uses machine tools such as lathes and milling machines and fabrication tools such as welders, breaks, presses, power threaders and punches
- uses precision tools such as laser alignment equipment, dial indicators, micrometers and precision and optical levels
- uses testing equipment such as vibration analysis as well as other techniques used in predictive and preventive maintenance
- installs, maintains and services compressed air, water and exhaust ducting to robotics, pumps, presses, compressors, turbines, material-handling systems, gearboxes and other machinery

## How long is the industrial mechanic millwright apprenticeship?

The in-school portion of this apprenticeship runs to 3 levels. Skilled Trades Ontario does not publish a total hour requirement for this trade on its trade page; confirm the current requirement in the trade's apprenticeship training standard before signing an agreement.

## What do you study in school for the 433A?

The in-school portion covers, but is not limited to:

- drawings and schematics
- rigging and hoisting
- power transmission systems
- electric and electronic controls
- pneumatic and hydraulic systems
- preventive and predictive maintenance
- welding, brazing and soldering
- compressors, vacuum pumps and related equipment
- pipe systems and valves
- fans, blowers and supporting ductwork
- internal combustion engines and electric motors
- lubrication types and systems
- basic machining using lathes, milling machinesand drill presses
- preparing bases for equipment

## Is industrial mechanic millwright a compulsory trade in Ontario?

No. Industrial Mechanic Millwright is a prescribed trade under section 1 of O. Reg. 876/21, but it is not on the compulsory list in section 2. That means you can legally work in this trade in Ontario without holding a Certificate of Qualification. Certification is voluntary and serves as formal proof of competency to employers and clients.

Voluntary classification only covers certification under the Building Opportunities in the Skilled Trades Act. Specific work within the trade can still require separate licences or permits under other Ontario statutes, so confirm the rules for the actual work being done. The 23 trades where certification is mandatory are on the [compulsory trades list](https://ontariocertificationregistry.ca/trades/compulsory/).

## How do you become an industrial mechanic millwright in Ontario?

The apprenticeship pathway for this trade is administered by Skilled Trades Ontario under section 14 of the Building Opportunities in the Skilled Trades Act, 2021:

1. **Find a sponsor and register a training agreement.** An employer or union sponsor takes you on and the training agreement is registered with the ministry.
2. **Complete the on the job and in school training.** The skills are set out in the trade's Apprenticeship Training Standard, signed off by your sponsor as you demonstrate them, alongside levels of in school theory at a training delivery agent.
3. **Receive your Certificate of Apprenticeship.** Skilled Trades Ontario issues it when the program is complete.
4. **Pass the certifying exam.** This trade has a certifying exam under O. Reg. 876/21, s. 3. Passing it earns the Certificate of Qualification, the voluntary proof of qualification for this trade.

The exact training standard, current curriculum and program details are on the [Skilled Trades Ontario page for Industrial Mechanic Millwright](https://www.skilledtradesontario.ca/trade-information/industrial-mechanic-millwright/). On the job hour requirements vary by trade and are not published on this page yet; confirm them in the training standard before signing an agreement.

## Is the 433A a Red Seal trade?

Yes. Industrial Mechanic Millwright participates in the Interprovincial Red Seal Program, the national standard for the trade across Canada, stewarded by the Canadian Council of Directors of Apprenticeship. A Red Seal endorsement on an Ontario Certificate of Qualification means the qualification is recognized in other provinces and territories without re examination, which matters for workers moving between provinces and for employers hiring from outside Ontario.

The Red Seal exam for this trade, written under the national title Industrial Mechanic (Millwright), has 135 multiple-choice questions, each with four possible answers and exactly one correct answer.

### How the 135 questions are distributed

| Major Work Activity | Questions |
| --- | --- |
| A. Performs common occupational skills | 25 |
| B. Performs rigging, hoisting/lifting and moving | 17 |
| C. Services mechanical power transmission components and systems | 32 |
| D. Services material handling / process systems | 24 |
| E. Services fluid power systems | 21 |
| F. Performs preventative and predictive maintenance, commissioning and decommissioning | 16 |

By question type, this trade's exam runs 30 to 40% knowledge and recall, 40 to 50% procedural and application, and 20 to 30% critical thinking.

- [Red Seal exam breakdown for Industrial Mechanic (Millwright): question counts by task](https://red-seal.ca/eng/trades/industrialmech/exam-information.shtml)
- [Red Seal exam preparation checklist](https://red-seal.ca/eng/resources/preparation-checklist.shtml)
- [How to register for a Red Seal exam](https://red-seal.ca/eng/resources/register.shtml)

From this site

## Industrial Mechanic Millwright (433A) Practice Exam

150 original practice questions with a full answer key, split across the trade's major work activities in the same proportions as the published exam breakdown, and an explanation and source citation on every question. **10 sample questions are free to read, answers included.**

[See the 10 free samples and the full weighting, $40 CAD](https://ontariocertificationregistry.ca/practice-exams/433a-industrial-mechanic-millwright/)

Independent study aid published by Ontario Certification Registry. Not affiliated with, endorsed by, or sourced from Skilled Trades Ontario, the Technical Standards and Safety Authority, or the Red Seal Program. Every question is original and written from the cited public source. Studying it does not guarantee an exam result. Everything else on this site is free.

## Already experienced? The Trade Equivalency Assessment

Workers with experience from outside Ontario's apprenticeship system, or from another country, can apply for a Trade Equivalency Assessment instead of starting an apprenticeship. Approval requires verifiable evidence of competency in the trade's Training Standard and experience at least equal to the trade's total training time; if approved, you challenge the certifying exam directly. The assessment costs $235 plus HST, and a reassessment with new evidence costs $100 plus HST, per [Skilled Trades Ontario's Trade Equivalency Assessment page](https://www.skilledtradesontario.ca/experienced-workers/trade-equivalency-assessment/).

## Certification is not the only paperwork

A Certificate of Qualification covers the person. Running a business in the trade carries its own obligations: many Ontario municipalities require a contractor licence on top of personal certification, and construction employers must complete WSIB registration before work begins. Both are indexed on our sister site: [municipal contractor licensing requirements by city](https://ontariotraderegistry.ca/licensing/) and [WSIB Form 1000, registration of constructors and employers](https://ontariotraderegistry.ca/compliance/wsib-form-1000/), on Ontario Trade Registry.

For wages, demand and what the day-to-day work looks like, see the [Industrial Mechanic Millwright career profile](https://bluecraneworks.ca/millwright-433a-certification.html) on Blue Crane Works.

## What does an industrial mechanic millwright earn in Ontario?

| Median wage | $35.59 per hour |
| --- | --- |
| Low | $23.00 |
| High | $48.50 |
| Occupation measured | Construction millwrights and industrial mechanics (NOC 72400) |
| Reference period | 2023-2024 |

Published by Employment and Social Development Canada through Job Bank, for Ontario as a whole. Read it as the pay range for the occupational group this trade belongs to, not a guaranteed rate: one NOC code can cover more than one trade, and wages vary by region, employer and experience.

## Is the 433A recognised outside Ontario?

This trade has been part of the Interprovincial Red Seal Program since 1964. 13 of Canada's 13 provinces and territories designate it Red Seal: AB, BC, MB, NB, NL, NS, NT, NU, ON, PE, QC, SK, YT, Ontario among them. Its National Occupational Classification code is 72400, which is how federal labour market data refers to this occupation.

## Where can you train as an industrial mechanic millwright in Ontario?

| Public training providers | 14 colleges deliver the in-school portion |
| --- | --- |
| Approved sponsors | 1,448 employers registered to train apprentices |
| Apprentices in training | 3,614 |

Counts are from Ontario's published apprenticeships dataset. A sponsor is the employer or union that registers and trains the apprentice; you need one before an apprenticeship can start.

## How dangerous is industrial work in Ontario?

Ontario does not publish injury figures per trade, only by sector. In 2024 the Ministry of Labour recorded 27 worker fatalities and 2,148 critical injuries under the industrial health and safety program. See [the ten-year counts and what they leave out](https://ontariocertificationregistry.ca/trades/safety/).

## Related Ontario trades

Other industrial sector trades with certification records on this registry:

- [Elevating Devices Mechanic (636E) certification requirements](https://ontariocertificationregistry.ca/trades/636e-elevating-devices-mechanic/)
- [Bearings Mechanic (615A) certification requirements](https://ontariocertificationregistry.ca/trades/615a-bearings-mechanic/)
- [Facilities Mechanic (255W) certification requirements](https://ontariocertificationregistry.ca/trades/255w-facilities-mechanic/)
- [Hydraulic/Pneumatic Mechanic (277Z) certification requirements](https://ontariocertificationregistry.ca/trades/277z-hydraulic-pneumatic-mechanic/)
- [Packaging Machine Mechanic (609C) certification requirements](https://ontariocertificationregistry.ca/trades/609c-packaging-machine-mechanic/)
- [Blacksmith (600P) certification requirements](https://ontariocertificationregistry.ca/trades/600p-blacksmith/)
- [Computer Numerical Control (CNC) Programmer (670C) certification requirements](https://ontariocertificationregistry.ca/trades/670c-computer-numerical-control-cnc-programmer/)
- [All 23 compulsory trades in Ontario](https://ontariocertificationregistry.ca/trades/compulsory/)

## Official verification sources

- Regulation[O. Reg. 876/21, Prescribed Trades and Related Matters (e-Laws)](https://www.ontario.ca/laws/regulation/210876)
- Certifying body[Skilled Trades Ontario: Industrial Mechanic Millwright](https://www.skilledtradesontario.ca/trade-information/industrial-mechanic-millwright/)
- Act[Building Opportunities in the Skilled Trades Act, 2021 (e-Laws)](https://www.ontario.ca/laws/statute/21b28)
- Wages[Job Bank wage data, Employment and Social Development Canada](https://open.canada.ca/data/en/dataset/adad580f-76b0-4502-bd05-20c125de9116)
- Red Seal profile[red-seal.ca: Industrial Mechanic Millwright trade profile](https://red-seal.ca/eng/trades/indust-mech-mill.shtml)
- Participation data[Ontario open data: Apprenticeships dataset](https://data.ontario.ca/dataset/apprenticeships)Classification, exam requirement and ratio status on this page are read directly from O. Reg. 876/21 as consolidated on e-Laws, not from secondary summaries. Facts not yet verified against a primary source are marked as not published rather than estimated.

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Source: https://ontariocertificationregistry.ca/trades/433a-industrial-mechanic-millwright/