Question 1

What kind of fit is H7/g6?

Accepted Answer

A small-clearance clearance fit that slides smoothly — used for light sliding or rotating parts and guide bushings (see the H7/g6 row).

Question 2

What do uppercase vs lowercase letters mean in a fit?

Accepted Answer

Uppercase is the hole tolerance, lowercase is the shaft tolerance. For example H7/g6 means an H7 hole with a g6 shaft.

Question 3

Where do I get the clearance/interference in μm?

Accepted Answer

This table selects the fit TYPE; the μm values depend on the size range (JIS B 0401-2, equivalent to ISO 286-2). The “Fit tolerance calculator” under Calculators looks up the deviations of the commonly used classes up to 500 mm and gives the max/min clearance or interference.