microfinish
nounEtymology From micro- + finish.
1
a positive integer used as a measure of the smoothness of any surface; higher numbers indicate rougher surfaces
- 1995 U.S. international Trade Commission - Certain Portable On-Car Disc Brake Lathes One cut is required and the microfinish will be somewhere in the range of 23 microns which is better than any other lathe on the market.