433A Study Guide 2026
Everything you need to pass the 433A exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
433A exam key facts
- The Red Seal exam for Industrial Mechanic (Millwright) has 135 multiple-choice questions, each with four answer options. Source
- Candidates get four hours to write the Red Seal Industrial Mechanic (Millwright) exam. Source
- The pass mark for the Red Seal Industrial Mechanic (Millwright) exam is 70%. Source
- The Ontario Industrial Mechanic Millwright (433A) Red Seal certifying exam costs $150 + HST, paid through the Skilled Trades Ontario Portal. Source
- Candidates who fail the Industrial Mechanic Millwright (433A) exam in Ontario must wait 30 days before retaking it and must pay the exam fee again before rescheduling. Source
- Ontario apprentices who complete the Industrial Mechanic Millwright (433A) program receive a Provisional Certificate of Qualification that is valid for one year, giving them time to pass the certifying exam. Source
📋 433A Exam Format at a Glance
📚 433A Topics to Study (39)
✍️ Sample 433A Questions & Answers
1. What does the designation 6205-2RS on a bearing indicate?
The 6205-2RS designation indicates a 6200-series deep groove ball bearing (62), with a 25 mm bore (05 × 5 = 25), and two rubber contact seals (2RS).
2. What is an air-over-oil system?
An air-over-oil system uses compressed air acting on top of oil in sealed tanks to push oil through a closed circuit to hydraulic cylinders. This combines the advantages of pneumatic power (simple, clean) with hydraulic smoothness and rigidity.
3. What is the function of a hydraulic relief valve?
A relief valve is a pressure-limiting safety device that opens when system pressure exceeds its set point, diverting excess flow back to the reservoir to prevent damage to pumps, cylinders, motors, and other system components.
4. Which factor most directly affects the L10 life rating of a rolling element bearing?
The L10 bearing life is calculated based on the ratio of the bearing's dynamic load rating (C) to the applied equivalent load (P). Life varies with the cube of this ratio for ball bearings and the 10/3 power for roller bearings.
5. What is the primary purpose of attaching a tagline to a suspended load?
A tagline allows workers to guide and stabilise a suspended load from a safe distance without being in the load's fall zone.
6. What condition is indicated by a blue discoloration on a bearing race?
Blue or straw-colored discoloration on bearing races indicates that the bearing has been subjected to excessive heat, typically above 200°C. This overheating compromises the bearing's hardness and load capacity.
🎯 Free 433A Practice Tests
📖 433A Guides & Articles
What Practice Test Geeks adds beyond an AI chat for 433A
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length 433A mock exam — 135 questions in 240 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed 433A question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable 433A cheat sheet you can print or save as a PDF.
- 433A flashcards built from the same question bank.
- Free 433A practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- skilledtradesontario.ca — Eligibility, renewal, test delivery, fees, retake policy, retake fee, score validity · verified Oct 2026
- red-seal.ca — Passing score, time limit, exam format · verified Oct 2026