The keyway sizes on the ISO gear (& probably others) is incorrectly dimensioned.
e.g. the key for a shaft over 44mm upto AND INCLUDING 50 should be 14x9
the key for a shaft OVER 50 and upto AND INCLUDING 58mm should be 16 x 10
The SW ISO gear toolbox component incorrectly specifies this as a 16 x 10 key (should be 14 x 9). In fact it incorrectly specifies the key size for ALL the boundary shaft sizes: 8, 10, 12, 17, 22, 30, 38, 44, 50, 58, 65 etc
This has been an issue since at least 2008 and is still an issue in 2016 SP2
(In answer to Toolbox Metric Keyway Dimension Problem )