What Is a 433A Certificate? Industrial Mechanic Millwright Explained
The 433A is the Certificate of Qualification for Industrial Mechanic (Millwright) in Ontario. Learn what it covers, how to get it, and how to write your 433A resume.
The 433A Certificate of Qualification (CofQ) is the Ontario College of Trades licence for Industrial Mechanic (Millwright) — one of the most in-demand compulsory trades in Ontario's manufacturing and industrial sector. If you hold a 433A, you can legally work as a Journeyman Industrial Mechanic on industrial equipment in Ontario. If you're writing your resume, the certificate number and expiry date belong directly under your name.
What does 433A cover?
The 433A trade involves the installation, maintenance, troubleshooting and repair of industrial machinery. A licensed 433A Millwright is qualified to work on:
- Hydraulic and pneumatic systems (cylinders, directional control valves, hydraulic power units)
- Gearboxes, drive shafts, couplings, and bearing assemblies
- Conveyor systems and material handling equipment
- Pumps, compressors, and mechanical seals
- Precision laser alignment of motors and gearboxes
- PLC-controlled systems (with escalation to automation technicians for programming)
- Welding and fabrication (MIG, TIG, Stick) — to trade standards
- Rigging and hoisting
- Industrial robots and robotic welding cells (at many facilities)
- CMMS work orders (SAP PM, Maximo, eMaint)
The 433A is a compulsory trade in Ontario, which means only licensed journeymen or registered apprentices under direct supervision can legally perform this work.
How to get a 433A certificate
Apprenticeship path:
- 1.Register with the Ontario College of Trades as an apprentice Industrial Mechanic
- 2.Complete a minimum 9,000 hours of on-the-job training under a licensed journeyman
- 3.Complete in-school training at a trades college (Centennial, Conestoga, George Brown, Humber, etc.)
- 4.Write the Certificate of Qualification exam
- 5.Pass = you receive your 433A CofQ
The apprenticeship ratio is typically 1 journeyman supervising up to 3 apprentices, depending on the employer.
Trade equivalency (prior learning):
Experienced mechanics with documented industrial work history may apply for a trade equivalency assessment through the Ontario College of Trades. This is the path for people who've been doing the work for years but never formally registered as apprentices.
Red Seal (Interprovincial):
After getting your 433A, you can challenge the Interprovincial Standards (Red Seal) exam to become nationally certified. This allows you to work in any Red Seal-participating province without retesting.
433A vs other millwright certifications
| Certification | Meaning |
|---|---|
| 433A | Ontario Certificate of Qualification — Industrial Mechanic (Millwright) |
| Red Seal 433A | Interprovincial Standards — recognized across Canada |
| 433B | Ontario CofQ — Millwright (non-industrial, less common) |
| 442A | Construction Millwright — different trade, focused on installation rather than maintenance |
Salary for 433A Millwright in Ontario 2025
| Type | Hourly Rate |
|---|---|
| 2nd/3rd year apprentice | $24–$32/hr |
| New Journeyman (433A) | $38–$48/hr |
| Experienced Journeyman | $48–$62/hr |
| Unionized (Unifor, SMWIA) | $54–$68/hr + benefits |
Automotive plants (Magna, Stellantis, Honda, Toyota), food manufacturing (Maple Leaf, McCain), and chemical facilities typically pay at the higher end and offer full pension and benefit packages.
How to write your 433A resume
Your resume header should include:
Industrial Mechanic (Millwright) 433A — Ontario CofQ [Number] | [City, ON]
Key sections to include:
Certifications:
- 433A Certificate of Qualification — Ontario College of Trades (include CofQ number)
- WHMIS 2015
- Working at Heights — Ministry of Labour
- Standard First Aid & CPR Level C
- Confined Space Entry (if applicable)
- Forklift Operator (counterbalance and/or reach truck)
- Rigging and Hoisting (if applicable)
Technical Skills — be specific:
- Name every hydraulic and pneumatic component you've worked on
- List your CMMS platforms (SAP PM, Maximo, eMaint)
- Name the PLC brands (Allen Bradley RSLogix 5000, Siemens S7) even if your role was only basic interaction
- List robot brands if you've done robot maintenance (Fanuc, ABB, KUKA)
- Specify welding processes (MIG, TIG, Stick) and material types
- Name alignment tools (Rotalign, Laser Pro)
Work Experience — sample bullets:
- Performed predictive and preventive maintenance on 80+ pieces of industrial equipment including hydraulic presses, conveyor drives and pneumatic actuators
- Reduced unplanned downtime by 35% through implementation of a weekly PM inspection schedule tracked in SAP PM
- Rebuilt Allen Bradley PowerFlex 700 VFD after motor failure on main production conveyor — line back online within 4 hours
- Mentored two first-year apprentices on LOTO procedures, hydraulic system diagnostics and bearing replacement
Build your 433A resume using the resume builder — the sample data is pre-loaded with an Industrial Mechanic profile. Run it through the ATS checker against your target posting before you apply.
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