.008????
I would ask to see the calibration of the measuring tools..
How big is .008?
Take one inch, divide it into a thousand even pieces, then count up 8.
Smaller than the diameter of a blonde human hair
They say you can feel a .004 scratch with your fingernail.
Indeed. Perhaps from manufacturing.
‘Perhaps.’ That’s rather huge.
No...
A standard machined part within tolerance of .005 has at least a 125 microfinish at worst... you can’t feel that even by dragging your fingernail across it.. it might fail a cottonball test though..