The GATE Grind

GATE 2021 ME (ME2) – Question 19

Metrology and Inspection · Limits, fits and tolerances · 1 mark · Multiple choice

The allowance provided in between a hole and a shaft is calculated from the difference between

  1. Shaft lower and hole upper
  2. Shaft upper and hole upper
  3. Shaft upper and hole lower
  4. Shaft lower and hole lower

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Show answer and explanation

Correct answer: (C) Shaft upper and hole lower

Explanation

Allowance is the intentional difference at maximum material condition: the smallest hole and largest shaft. It represents minimum clearance or maximum interference.

Thus use **upper shaft limit and lower hole limit (C)**. The sign depends on whether clearance or interference is being reported.