Read the callout.
Own the tolerance.
Every ASME Y14.5-2018 concept — feature control frames, datums, MMC bonus tolerance, position, profile — as original micro-lessons with diagrams, plus live bonus-tolerance, virtual-condition and tolerance-stack calculators. Then a timed mock and an engineering-grade gap report.
Learn, test, close the gaps
Study the concepts
Concise, original micro-lessons across the full ASME Y14.5-2018 — with diagrams where a picture beats words.
Take a timed mock
A 60-question, section-weighted mock of applied questions — calculations and interpretation, the way it's really tested.
Get your gap report
A per-section and per-topic scorecard shows your strongest and weakest areas, with a full explanation for every miss.
Learn it. Then prove it on a mock.
Concise, exam-focused lessons across the GD&T per ASME Y14.5-2018 — written original, with diagrams where they help.
Fundamentals
Done studying? Put it to the test.
GD&T calculators
The numbers a drawing actually needs — bonus tolerance from MMC, worst-case virtual condition boundaries, and 1-D tolerance stack-up (worst-case & statistical RSS).
Bonus = actual − MMC — the position zone grows as the feature departs from MMC toward LMC. Free tolerance most engineers leave on the table.
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- 3 mock exams
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- Every wrong-answer explanation
- Difficulty & strongest/focus topics
Not affiliated with ASME. GD&T concepts per the public ASME Y14.5-2018 standard structure. All questions, lessons and diagrams are original, written by GCC ERA.
The free GD&T resource that actually exists.
Study the concepts, take one honest mock, and get a clear map of what to fix.