Engineering · Trainer
GD&T trainer quiz.
Twelve questions on the geometric characteristics, datum rules, and material-condition modifiers of ASME Y14.5-2018. One question at a time, instant feedback, and a one-line explanation for every answer — see how close you are to print-room ready.
Technically reviewed by the True Precision Machining engineering team · Last reviewed June 2026
Standards referenced: ASME Y14.5-2018
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Tip: number keys 1–4 answer the current question. Every answer is checked against ASME Y14.5-2018 and our GD&T symbols reference.
Why drill this
GD&T fluency is cheaper than a scrapped part.
A feature control frame is a sentence, and misreading one word changes the meaning: confuse circular runout with total runout and a passing journal fails at assembly; miss an Ⓜ modifier and you give away bonus tolerance the designer meant you to have — or claim bonus that isn't there. This quiz drills the misreadings we actually see on incoming prints: datum rules, modifier defaults, and the look-alike characteristics.
Score low on a category? The full symbols reference breaks down all 14 characteristics with examples, and the printable cheat sheet keeps the chart at the machine. For position work, the true position calculator converts X-Y deviations to a position diameter — MMC bonus included.
Questions and answers follow ASME Y14.5-2018. Concentricity and symmetry were withdrawn in that revision but still appear on legacy Y14.5-2009 (and earlier) drawings, so they remain in the question pool — flagged as legacy.
Keep exploring
Related tools & references
All 14 characteristics — the ground truth this quiz draws from.
One-page symbol chart for the shop floor or print room.
X-Y deviation to position diameter, with MMC bonus tolerance.
What tight tolerances cost and when GD&T earns its keep.
Drawings full of GD&T? That's our daily work.
Position at MMC, profile back to the CAD datum structure, runout on bearing journals — send the print and we'll machine and inspect to ASME Y14.5. Aerospace, medical, and defense work welcome.
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