Originally Posted by CC2099
The minimum thickness according to the online 2011 Mustang workshop manual
is 17.4mm. Besides, would a company selling a brand new rotor provide minimum thickness specs or would they provide the current dimensions?
They are providing the new, unused thickness spec.
And yes. That is the "rounded off", or "rough" measurement. There is probably some variance in the final measurements due to the cutting bits in the lathe wearing down slightly over time.
If you are concerned about the rotors being slightly thicker than the factory specifications, or that they are slightly different thicknesses between the two sides, it is perfectly acceptable as long as they are thicker than the 17.4 mm minimum.