Discussion
A fit designed as 30H7/g6 is a :
Answer: A
30H7/g6 is a clearance fit.
In the ISO system, H is the hole basis: the hole's lower limit is exactly the basic size of 30 mm. The shaft letter g lies below the zero line, so the largest shaft is still smaller than the smallest hole. There is always a gap, which makes it a close sliding or running clearance fit.
Shaft letters j, k, m and n give transition fits, and p, r, s and beyond give interference fits. 'Tolerance fit' is not a class of fit at all: every fit has tolerances.
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