Just as a side note, the US system gets worse and worse when you look beyond the everyday units of measure.
Sure, inches are great, but below 1/4", screws are in a numbered system (higher number is larger) while the corresponding drill bits are in a different numbered system (higher number is smaller) or lettered (A to Z). Wire and sheet metal gage numbers are still different.
Sure, inches are great, but below 1/4", screws are in a numbered system (higher number is larger) while the corresponding drill bits are in a different numbered system (higher number is smaller) or lettered (A to Z). Wire and sheet metal gage numbers are still different.
An #8-32 thread takes a #29 tap drill...
https://www.lincolnmachine.com/tap_drill_chart.html